Vmod 3850 through BIOS apparently IS possible....

I was following a post in a forum and was in different language...couldnt read it UGH and I dont have the forum I was on...
but one guy made a BIOS for the 3850 256MB that is labeled 7701000.zip and another 7701000a.zip

the first one did not work for me as it must have not had the correct checksum cuz the vendorID and bios name and all that information was blank when I flashed it. HOWEVER I tried the 7701000a.zip one and it raises the voltage tables up from the standard 3850 to 1.33v which isnt that close to the 3870?

Anyways, I did not take any readings with voltmeter BUT...before this bios I was only stable at 730mhz on the core and anything higher would freeze in games within minutes.
With this bios Im able to run games all day @ 770 even crysis....
I know its not hitting the 860mhz limit and I think a vmod via hardware is still a surefire way cuz I should get higher clocks...BUT I do think there is something to the software vmod also being that I gained 40mhz...

Bios was unfortunately .67 version which is the locked one but....that aside...
I think this might go somewhere....anyways leave feedback or tips or comments or whatever lol I would like to see if more can come from this.

PS I also confirmed the correctly changed voltage tables via rivatuners information readout of the powerplay modes...and indeed its been changed from its default to 1.33v =)

many thanks for this info , i went off to find the file and it definitely works on my sapphire 256mb card :D

http://www.benchmark.co.yu/forum/sho...=150149&page=3

Just testing and im up from 750 , to 789 , still testing but wont go higher without artifacts , core temp has gone from 42c load to 45c load , thats with a maze 4.

many thanks :up:

awesome....now we need someone who can adjust the voltages and do the appropriate checksums in english...LOL so we can read and follow it easier...also then we can test it out and see how effective the vmod bios is after all...since now its worked for 2 of us.

Can you post these moded bioses?

Maybe only certain voltage settings work? Interesting.

should these cards have software support for changing the volts? like HD 2900 on Ati Tools?

Then you dont even need a BIOS mod if so, just software to support it.

Quote:

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Originally Posted by chp

Can you post these moded bioses?

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This is the one i used
http://www.benchmark.co.yu/forum/att...6&d=1197582504

Thanks.

I'll try it ASAP. Stay tunned.

Guys, i tried that 4 days ago, it works up till the 1.33v limit, i changed it to 1.4v but it didn't overclock even 1MHz more, don't think it works over the 3870 voltage.

Might be wrong, needs some testing.

Topic here is 3850, not 3870's os008.

Quote:

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Originally Posted by STEvil

Topic here is 3850, not 3870's os008.

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I think what he was saying, that being a 3850 or a 3870...there is a hard limit on voltage past 1.33v...is the theory anyways.
It pertains both to 3850's and 3870's =)

anyways, through more knowledgeable voltage / clock settings in bios along w/ the correct checksum for those bios modifications...I believe would be a good analysis on whether it works or not...
I dont have the knowhow of doing it...rofl...I just stumbled across that page.
Ive been playing around a little more with my card and so far Ive taken it to 790mhz w/ the bios I posted earlier.

Quote:

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Originally Posted by chrisf.uk

This is the one i used
http://www.benchmark.co.yu/forum/att...6&d=1197582504

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It doesn't work. Got many artefacts. :shrug:

GenTarkin - makes more sense. Thanks.

Here's Stilt's BIOS, 862 limit fixed, 1.327v (3870's voltage), and already clocked at 760 core ...

760830-1327v-v071


EDIT: by the way, this BIOS isn't 100% as he gave it to us, i changed it to give more voltage and have more Core speed!

Argh... :mad:
Seems none of the moded bios I try works. Thay causes troubles to my Connect3D HD3850-512 (blank screen or big artefats or unrecognised under Windows). Strange enouth since the card itself seems to be based on the standard ATI layout.:shrug:

I post my own bios, someone can manage to modify It? I don't have enouth knowledge to modify it by myself. It will be greatly apreciated.

Here's your BIOS modified.

By the way, the BIOS i posted above is for the 256MB version, sorry about not mentioning so before!

Quote:

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Originally Posted by os008

Here's your BIOS modified.

By the way, the BIOS i posted above is for the 256MB version, sorry about not mentioning so before!

---

Many many thanks.:clap:

If I understand, one is default clocks but with 1.33v mod and the other is for 760Mhz core and 1.33v. I'm right?:up:

I'll try it ASAP tonight..... Big Hope it work (crossed fingers) ;)

Hehe, i'm not responsible for any fireworks in the unforseen future :P.

Both have a 1.33v, but i thought i would add both speed for you, try with the first, then overclock to 760, if it's stable, then flash the second and you'll have it without the need to use Overdrive ;).

I flashed mine with 878 core and 999 mem speeds, much easier, but kept the voltage default cause i'm using a hard volt-mod, didn't want to screw that up. :D


EDIT: by the way, i didn't modify your BIOS to pass the 860MHz limit, i can't do that, that fix is from AMD, no-one does it, i think there's a 512MB BIOS that doesn't have this limit here on this forum, don't know if you tried it yet or not, i'll try to get it and link it for you here.

EDIT2: Here're 2 additional BIOS' i found, the HIS one is v071, which is the same version as the one i'm using on my card, but for the 256MB, doesn't have that 860 limit.

The second one is older, v070, but adds an alternative for you to test with, not sure if it doesn't have that limit.

Also, the reason why a BIOS won't work for you is the RAM rating, or brand ... etc, that's why i modded 2 more for you.

Hope one works :).

Quote:

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Originally Posted by os008

Here's Stilt's BIOS, 862 limit fixed, 1.327v (3870's voltage), and already clocked at 760 core ...

760830-1327v-v071


EDIT: by the way, this BIOS isn't 100% as he gave it to us, i changed it to give more voltage and have more Core speed!

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does CCC - overdrive still work properly w/ this BIOS?

I don't get it, why not sharing the tool for modifying the bios...or make a how-to?:confused:

This creating of bioses to rigth and left is kinda silly, just give some hints on how to do it instead.

Quote:

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Originally Posted by Clint

I don't get it, why not sharing the tool for modifying the bios...or make a how-to?:confused:

This creating of bioses to rigth and left is kinda silly, just give some hints on how to do it instead.

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You're right! :clap:

Quote:

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Originally Posted by GenTarkin

does CCC - overdrive still work properly w/ this BIOS?

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No, it's screwed up, that's why i used Rivatuner to get stable clock, then write it inside the BIOS and flash it and get rid of the hassle. :)

Quote:

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Originally Posted by Clint

I don't get it, why not sharing the tool for modifying the bios...or make a how-to?:confused:

This creating of bioses to rigth and left is kinda silly, just give some hints on how to do it instead.

---

Silly? was i wrong to help someone? didn't get the idea of making a tutorial, not good at it, so i just posted the BIOS' for testing, not going to it again anyway, those are all there is to modify.

Anyway, it's not that hard, ... start HxDen, search for BE04 as Hex Value, press F3 to search again, and you'll find yourself at a distinctive pattern.

HxDen Editor

Let's say you want to change the voltage from 1.2 to 1.3 ... open up the windows Calculator, set it to Scientific, then Hex, then write 04BE, then press on Dec, should give you 1214, that's 1.214v, to get 1.327, then write 1327 in Dec mode, then switch to Hex, you'll get 52F, reverse it, so it's 2F05, now write that number instead of BE04, as easy as that.

For frequencies, you'll find 540501 on the same line of the voltage to the left, if you don't see 54, you'll find it just at the end of the line above it to the right, that's the number for 669 core frequency, reverse it ... 010554, and convert it ... 66900, that's 669.00MHz, write 76000 ... 128E0, reverse it ... E02801, write it in place of the frequency inside the file, again, as easy as that.

Just got it by experimentation, and bits of info from here and there, note that i don't know ANYTHING about how to calculate Hex values, or why do i have to reverse them, or why do i have to keep the middle number fixed ... etc, i just managed to get something going that i need, i don't care to understand how it works, as long as it works.

The second program is for comparing files in Hex mode, i use it a lot because sometimes i forget where the pattern is if i changed the voltage for example, all i have in my memory is BE04, so i open up the original BIOS, compare it to the one i changed, then search for that Hex, and i get where i want to be.

Hex Compare

Hope it helped.


EDIT: Here's a link explaining the same thing, but in what seems to be Yoguslavian or something (guess so from the address).

http://www.benchmark.co.yu/forum/sho...d.php?t=150149

so your editing the bios and the checksum not matching anymore after you edited it... doesnt matter? :confused: i thought you cant flash a bios without matching checksum or the bios wouldnt work...

Quote:

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Originally Posted by os008

Here's Stilt's BIOS, 862 limit fixed, 1.327v (3870's voltage), and already clocked at 760 core ...

760830-1327v-v071


EDIT: by the way, this BIOS isn't 100% as he gave it to us, i changed it to give more voltage and have more Core speed!

---

my card still freezes around 840 and the mem overclocks worst with this bios, can't go over 1050 with this bios, I could go to 1179 before

Quote:

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Originally Posted by os008

Here's your BIOS modified.

By the way, the BIOS i posted above is for the 256MB version, sorry about not mentioning so before!

---

Yeah, Yes... os008, It WORKS...... I'm Happy.:up:
Finally I'm able to push my clocks up to 790Mhz for the Core and 999Mhz for the Mem. Very Good Work :clap:

hi

i have got a hd3850 256MB made by sapphire.

I tried to flash bios 760830-1327v-v071 but i couldn't wrote it

Atiflash didn't recognize anything (bios have got a strange .bin extension ) and i didnt want to risk...
7701000a.zip works fine for me.

And there is a difference between this 2 bioses
7701000a.zip - 62 464 size
760830-1327v-v071 - 65 536

... whats wrong ?

Can somebody modify bios for 256 MB 3850 ulocked and rised voltage and pos it here ?

Quote:

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Originally Posted by os008

Here's Stilt's BIOS, 862 limit fixed, 1.327v (3870's voltage), and already clocked at 760 core ...

760830-1327v-v071


EDIT: by the way, this BIOS isn't 100% as he gave it to us, i changed it to give more voltage and have more Core speed!

---

I measured 1.288V with this BIOS. On the original one the measuring is 1.240V. With orignal I can get core 730 stable, with this one 756 stable.
Can you make the same one BIOS, but 1053MHz Mem in 3D, for me, please.

can anybody answer for my questions above ?

why there is difference in files size ?
why atiflash didint recognize the secend one bios file

Quote:

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Originally Posted by os008

No, it's screwed up, that's why i used Rivatuner to get stable clock, then write it inside the BIOS and flash it and get rid of the hassle. :)



Silly? was i wrong to help someone? didn't get the idea of making a tutorial, not good at it, so i just posted the BIOS' for testing, not going to it again anyway, those are all there is to modify.

Anyway, it's not that hard, ... start HxDen, search for BE04 as Hex Value, press F3 to search again, and you'll find yourself at a distinctive pattern.

HxDen Editor

Let's say you want to change the voltage from 1.2 to 1.3 ... open up the windows Calculator, set it to Scientific, then Hex, then write 04BE, then press on Dec, should give you 1214, that's 1.214v, to get 1.327, then write 1327 in Dec mode, then switch to Hex, you'll get 52F, reverse it, so it's 2F05, now write that number instead of BE04, as easy as that.

For frequencies, you'll find 540501 on the same line of the voltage to the left, if you don't see 54, you'll find it just at the end of the line above it to the right, that's the number for 669 core frequency, reverse it ... 010554, and convert it ... 66900, that's 669.00MHz, write 76000 ... 128E0, reverse it ... E02801, write it in place of the frequency inside the file, again, as easy as that.

Just got it by experimentation, and bits of info from here and there, note that i don't know ANYTHING about how to calculate Hex values, or why do i have to reverse them, or why do i have to keep the middle number fixed ... etc, i just managed to get something going that i need, i don't care to understand how it works, as long as it works.

The second program is for comparing files in Hex mode, i use it a lot because sometimes i forget where the pattern is if i changed the voltage for example, all i have in my memory is BE04, so i open up the original BIOS, compare it to the one i changed, then search for that Hex, and i get where i want to be.

Hex Compare

Hope it helped.


EDIT: Here's a link explaining the same thing, but in what seems to be Yoguslavian or something (guess so from the address).

http://www.benchmark.co.yu/forum/sho...d.php?t=150149

---

Thanks for that guide =) I tried your modified bios the original one and I Still think we need some sort of checksum fix on these...cuz when I flashed with yours, the vendor id..product name...bios version fields were blank.....(result from atiflash proggy) when I rebooted...black screen so I flashed back to 7701000a I posted earlier...that one does have the proper information in those fields.
I tried modifying my own also based off the 7701000a and...when I did the same as above same result all atiflash fields were blank and black screen...so flashed back to original 7701000a bios.
Is there any way to find out the proper new checksum for our edited bios's and apply that too the file?

Getting the file checksum is easy i think, not sure, but if you open HxDen and highlight the whole file, then go to Analysis (menu), then Checksum and choose the 16-bit Checksum, you'll get a number at the bottom.

We need an expert to tell us if that's the 'right' checksum, or the needed one, and how to apply it in the first place to the file, tried looking for any command in ATiWinFlash but couldn't find one, actually i found some Checksum related commands, but they're cyptic to me.

Anyway, i'm glad i could be of some help, good luck.


Note: don't know why you're getting blank screen, but i tried a lot of BIOS' with forced flashing, and they all work as long as they have the right memory size (256MB).

can u explain why this 2 bioses had got two different sizes ?

i think that here is the problem . one of them works fine (7701000a.zip) another 760830-1327v-v071 (blank screen )

Quote:

---

Originally Posted by os008

No, it's screwed up, that's why i used Rivatuner to get stable clock, then write it inside the BIOS and flash it and get rid of the hassle. :)



Silly? was i wrong to help someone? didn't get the idea of making a tutorial, not good at it, so i just posted the BIOS' for testing, not going to it again anyway, those are all there is to modify.

Anyway, it's not that hard, ... start HxDen, search for BE04 as Hex Value, press F3 to search again, and you'll find yourself at a distinctive pattern.

HxDen Editor

Let's say you want to change the voltage from 1.2 to 1.3 ... open up the windows Calculator, set it to Scientific, then Hex, then write 04BE, then press on Dec, should give you 1214, that's 1.214v, to get 1.327, then write 1327 in Dec mode, then switch to Hex, you'll get 52F, reverse it, so it's 2F05, now write that number instead of BE04, as easy as that.

For frequencies, you'll find 540501 on the same line of the voltage to the left, if you don't see 54, you'll find it just at the end of the line above it to the right, that's the number for 669 core frequency, reverse it ... 010554, and convert it ... 66900, that's 669.00MHz, write 76000 ... 128E0, reverse it ... E02801, write it in place of the frequency inside the file, again, as easy as that.

Just got it by experimentation, and bits of info from here and there, note that i don't know ANYTHING about how to calculate Hex values, or why do i have to reverse them, or why do i have to keep the middle number fixed ... etc, i just managed to get something going that i need, i don't care to understand how it works, as long as it works.

The second program is for comparing files in Hex mode, i use it a lot because sometimes i forget where the pattern is if i changed the voltage for example, all i have in my memory is BE04, so i open up the original BIOS, compare it to the one i changed, then search for that Hex, and i get where i want to be.

Hex Compare

Hope it helped.


EDIT: Here's a link explaining the same thing, but in what seems to be Yoguslavian or something (guess so from the address).

http://www.benchmark.co.yu/forum/sho...d.php?t=150149

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Excellent!:up:

Thanks for taking the time to throw that together!

I did not mean that you in particular were silly, more the fact that there are 3 or more persons making custom bioses but no info on how to do it.;)

Hehe, it's cool, i just wanted to help, i never wrote a guide, and i'm so bad at explaining stuff (as you might have noticed :P), but glad i could help.

Quote:

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Originally Posted by KainXS

my card still freezes around 840 and the mem overclocks worst with this bios, can't go over 1050 with this bios, I could go to 1179 before

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I didn't change any memory timings or voltages, i just modded the core frequency and voltage for it as Stilt posted it.

As for the core, might be because you haven't hard volt-modded your card yet, if you did, then might be because it's over-heating, happened to me around 904, that's why i'm stuck at 878 for now, can't go higher without crashing cause of heat!

Quote:

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Originally Posted by robbot

can u explain why this 2 bioses had got two different sizes ?

i think that here is the problem . one of them works fine (7701000a.zip) another 760830-1327v-v071 (blank screen )

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The BIOS i modded is Stilt's, it's a 'newer' version, that's why it has a different size.

I don't know why is it giving you a blank screen, it worked for me, and for Chuk, and Chp too.

Quote:

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Originally Posted by Chukundur

I measured 1.288V with this BIOS. On the original one the measuring is 1.240V. With orignal I can get core 730 stable, with this one 756 stable.
Can you make the same one BIOS, but 1053MHz Mem in 3D, for me, please.

---

It's attached to this post Chuk, and to avoid locals running after me with torches, i won't post anymore BIOS', use the ... 'guide' :P ... i posted in this thread please.

Thanks.

anyone check their GDDR3 max rated freq yet

Quote:

---

Originally Posted by robbot

can u explain why this 2 bioses had got two different sizes ?

i think that here is the problem . one of them works fine (7701000a.zip) another 760830-1327v-v071 (blank screen )

---

Hi! I can explain it.

Here is the necessary:

1. Latest version of atiflash program.

It is used to “load” BIOS file from card and to flash edited bios.

2. Any hex editor

It is used to change certain HEX values in BIOS

Make bootable USB disk with ATI flash on it. After booting, start the ATI flash using command "atiflash -s 0 bios.rom"
Go back to Windows and load the bios.rom
Open the Overdrive section in Catalyst CC and look for def. clock values for 3D ( it is usual 667Mhz). In BIOS everything is written in HEX + backward. Frequency values are written with 5 characters (before HEX interpretation), and voltage values are written with 4 characters.

For example 669Mhz as 66900, 1150Mhz as 11500, and voltage 1.21V as 1210.
Open the base converter in HEX editor (if you use this editor), or you can use Win calc. Enter the 66900 in calc and (we are looking for 3D GPU value in BIOS) and convert it to HEX (we need 3 pairs of two caracters).

66900 (dec) -> 01 05 54 (hex)

Now we are looking for inverted HEX value in BIOS. We are looking for 54 05 01 (i.e. 669Mhz).

In ASUS 3850 256MB BIOS it is located at address AAE8 (just behind the memory speed value) – we are not interested in this row (if you change any of those two values, catalyst will no longer recognize the VGA, it will be standard VGA), and in this table, little lower, at address ADBF to AE4F. MEM speed value is just beside GPU speed value, followed by GPU voltage value.

Here is how it looks in HEX editor

http://img146.imageshack.us/img146/2...xeditorba0.jpg

When complete table is copied in Excel, and we rearrange it a little, it looks like this. You can notice that all values are written 10X – 2D, 3D, overdrive, limits, UVD, thermal throttling? … Does anybody have it documented?

http://img526.imageshack.us/img526/5954/hex3850jg4.jpg
Now the question is: Which value to change? After thirty or more attempts best result is obtained by changing the 4th and 7th value in table, i.e. line 8th and 14th in Excel. By this way Overdrive limits are unchanged, and overdrive runs normal, 2D stays on default, and memory is not at its limit in 2D.
Here is the Catalyst CC def. look after BIOS mod:
http://img504.imageshack.us/img504/6024/catalystse6.jpg

I have used unchanged 2D at 300/892, for me, and changed 3D at 750/100 (def. is 669/829), and changed 3D GPU voltage from 1.214V to 1.327 V.

300MHz - 30 75 00
669MHz - 54 05 00
750MHz - F8 24 01
770MHz - C8 2C 01
1GHz - 10 27 00
1.05GHz - 04 29 00
1.1GHz - F8 2A 00

1.014V - F6 03 (2D for 3850)
1.214V - BE 04 (3D for 3850)
1.241V - D9 04 (2D for 3870)
1.327V - 2F 05 (3D for 3870)

Save it as ocbios.rom and copy it to USB bootable disk.

After booting, flash it to VGA using the command "atiflash -p 0 -f ocbios.rom"

7701000a.rom is with changed 2D voltage to 1.241V to improve OC.

Quote:

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Originally Posted by os008

It's attached to this post Chuk, and to avoid locals running after me with torches, i won't post anymore BIOS', use the ... 'guide' :P ... i posted in this thread please.

Thanks.

---

Thaks a lot. I apologize, but alreday try to modify mine bios (probably not hard enough) without success. So, what voltage did you measure on your card? It should be 1.327V with this BIOS, but I measired 1.288V?!

I never measured it when i soft volt-modded, after testing that BIOS i just hard volt-modded then flashed the 878 speed one i made for myself after making sure it's stable at that speed, used 1.4v for it.

But if it's stable at that voltage then it might be just a v-droop, or so they call it, though, i only heard about it related to Motherboards, don't know about VGA, it's not necessarily and bad thing, but anyway, to get more voltage you have to hard volt-mod.

Download the BIOS i made for you again please Chuk, i editted it, i made a tiny harmless mistake before, but corrected it, if the first one is working then nevermind :).

os008, do you have a copy of the 512 unlocked BIOS modified to use the extra voltage?

This is very interesting!

So the 3850 has a 2D value of 1.014V ..and the 3870 1.241V ?

They both run at 300MHz in 2D, so why can't we have the lower value on a 3870?

If I try edit the bios to my 3870 and the voltage for some reason is to low, would that mean that I can no longer boot up the card again...meaning bricking it?

Quote:

---

Originally Posted by Clint

This is very interesting!

So the 3850 has a 2D value of 1.014V ..and the 3870 1.241V ?

They both run at 300MHz in 2D, so why can't we have the lower value on a 3870?

If I try edit the bios to my 3870 and the voltage for some reason is to low, would that mean that I can no longer boot up the card again...meaning bricking it?

---

My 3850 256Mb is running on 1.014V in 2D, and it's flashed to 770/1000 for default clocks. I think that 3870 must run at 1.014V in 2D. It's better GPU (XT version) and it must be capable to run at lower voltages + it's PCB is much better than PCB for HD3850.

Quote:

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Originally Posted by goranm

My 3850 256Mb is running on 1.014V in 2D, and it's flashed to 770/1000 for default clocks. I think that 3870 must run at 1.014V in 2D. It's better GPU (XT version) and it must be capable to run at lower voltages + it's PCB is much better than PCB for HD3850.

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Yes, this sounds logical.:)

I will try tomorrow, hopefully I get a much cooler card when idle:up:

Quote:

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Originally Posted by os008

..
Download the BIOS i made for you again please Chuk, i editted it, i made a tiny harmless mistake before, but corrected it, if the first one is working then nevermind :).

---

You made 105.3Mhz instead 1053.0MHz. I already found how to edit the BIOS, and made mine own. Thank you anyway.

Quote:

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Originally Posted by Eldonko

os008, do you have a copy of the 512 unlocked BIOS modified to use the extra voltage?

---

I don't, sorry Eld, try to look for a BIOS version 071 and above, did you check your BIOS version?

So finnaly

can anybody modify bios
7701000a.rom

extra voltage on gpu (like 3870 ) + ulocked ?

i will be very grateful

Quote:

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Originally Posted by robbot

So finnaly

can anybody modify bios
7701000a.rom

extra voltage on gpu (like 3870 ) + ulocked ?

i will be very grateful

---

7701000a.rom is modified ASUS HD3850 256MB BIOS with changed 2D&3D voltages (from 1.014V/1.214V to 1.241/1.327V) and changed def. 3D GPU and memory clocks from 669/829 to 770/1000. :up:

someone should compare a limited bios and 071 bios to see what the fix is.

Hehe, i did as soon as i got it Stevil, that was 3 days ago i think, and there were way TOOOO many differences, but maybe someone more professional in this matter that can spot the 'real' differences setting aside the offsets.

why the 2d voltage is changed ? what for ?

so now mayby someone can unlock this bios ? becouse my hd3850 works ok on standard voltage when 770mhz is on gpu... an i couldn't oc more becouse lock..

os008 and goranm, great work!!! :toast:

Quote:

---

Originally Posted by robbot

why the 2d voltage is changed ? what for ?

so now mayby someone can unlock this bios ? becouse my hd3850 works ok on standard voltage when 770mhz is on gpu... an i couldn't oc more becouse lock..

---

Lock? What lock? I use RivaTuner 2.06 for overclocking? Why? Because when I OC it from stupid CC maximum is 770Mhz, and GPU frequency is changing during 3D tests because GPU is reducing it's frequency when GPU load is under, lets say, 80%. You can notice this in Riva Tuner when you OC unmodified card (667/826). It drops to 669/826Mhz (2D clocks) when GPU is waiting for CPU or when it's limited by refresh rate. When you OC it with RT it is rock solid at given frequency, because RT can't separate 2D and 3D. Take a look at HD3850 with unmodified BIOS. Same is happening with modified 3850 when you OC its memory above 1000Mhz from CC (def. for modified BIOS is 1000). If you OC it to 1050 it will drop to 1000. GPU limit from CC is 770MHz. Riva Tuner 2.06 solves these problems, and can go 800+ for GPU. That's the most important reason to set 1.241V in 2D or it will crash in 2D during OC. ;)

Quote:

---

Originally Posted by os008

Here's Stilt's BIOS, 862 limit fixed, 1.327v (3870's voltage), and already clocked at 760 core ...

760830-1327v-v071


EDIT: by the way, this BIOS isn't 100% as he gave it to us, i changed it to give more voltage and have more Core speed!

---

can you post the original v071 bios for 256MB 3850 card?

http://www.xtremesystems.org/forums/...42#post2633142

I can't get my CCC to show higher frequencies for the OC sliders for my 760/936 bios@1.33v. I missed something in the manual. :confused:
Any Idea?

Quote:

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Originally Posted by os008

Here's Stilt's BIOS, 862 limit fixed, 1.327v (3870's voltage), and already clocked at 760 core ...

760830-1327v-v071


EDIT: by the way, this BIOS isn't 100% as he gave it to us, i changed it to give more voltage and have more Core speed!

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do you use atiflash or winflash to flash this. i can get 770/1000 with my original bios. should i mind flashing to this bios?

Info on changing the checksum:
http://www.xtremesystems.org/forums/...&postcount=134

So, is there a 3850 512mb bios that doesn't have a clock limit? I looked around but can't seem to find a definite answer

Quote:

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Originally Posted by heygal

do you use atiflash or winflash to flash this. i can get 770/1000 with my original bios. should i mind flashing to this bios?

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i use the WinFlash program ...

atiwinflash -f -p 0 <filename>

and wait for like a minute till i get a popup that confirms my flash!

Quote:

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Originally Posted by os008

i use the WinFlash program ...

atiwinflash -f -p 0 <filename>

and wait for like a minute till i get a popup that confirms my flash!

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the funny thing is that i cant find the ~ button under ms-dos. haha the filename has a ~ sign.

i tried winflash and it does not work, it says VBIOS cannot be found.

ok this is my third post in a row. i managed to flash the bios. before the flash i had stable 750/1000 now i have stable 800/1000. Thats a 50 mhz more. i am running a hd 3850 256 mb with 80% fan speed. my temp is 70 C under load. This is a good bios but the ati CCC overdrive does not function with this so you have to use rivatuner to overclock

Os how do you get a stable 880 mhz on the core clock?

Quote:

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Originally Posted by os008

Hehe, i'm not responsible for any fireworks in the unforseen future :P.

Both have a 1.33v, but i thought i would add both speed for you, try with the first, then overclock to 760, if it's stable, then flash the second and you'll have it without the need to use Overdrive ;).

I flashed mine with 878 core and 999 mem speeds, much easier, but kept the voltage default cause i'm using a hard volt-mod, didn't want to screw that up. :D


EDIT: by the way, i didn't modify your BIOS to pass the 860MHz limit, i can't do that, that fix is from AMD, no-one does it, i think there's a 512MB BIOS that doesn't have this limit here on this forum, don't know if you tried it yet or not, i'll try to get it and link it for you here.

EDIT2: Here're 2 additional BIOS' i found, the HIS one is v071, which is the same version as the one i'm using on my card, but for the 256MB, doesn't have that 860 limit.

The second one is older, v070, but adds an alternative for you to test with, not sure if it doesn't have that limit.

Also, the reason why a BIOS won't work for you is the RAM rating, or brand ... etc, that's why i modded 2 more for you.

Hope one works :).

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Hello os008,

Thank you for your hard work. I'm a bit confused though, is the HIS BIOS you posted above from a HIS IceQ Turbo 512 MB card (default 720 mhz GPU) set to 1.33V and what speed? I'm receiving that exact card today and would love to flash it with the highest voltage possible nowadays (1.33V?).

Thank you!

Quote:

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Originally Posted by heygal

ok this is my third post in a row. i managed to flash the bios. before the flash i had stable 750/1000 now i have stable 800/1000. Thats a 50 mhz more. i am running a hd 3850 256 mb with 80% fan speed. my temp is 70 C under load. This is a good bios but the ati CCC overdrive does not function with this so you have to use rivatuner to overclock

Os how do you get a stable 880 mhz on the core clock?

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I hard volt-modded with a Variable Resistor, set the voltage to 1.4v (max that doesn't give me critical temperature) and fan at 60% all the time, and indeed, CCC doesn't work if i go over the limit inside it, that's 770.

Quote:

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Originally Posted by Rick Hunter

Hello os008,

Thank you for your hard work. I'm a bit confused though, is the HIS BIOS you posted above from a HIS IceQ Turbo 512 MB card (default 720 mhz GPU) set to 1.33V and what speed? I'm receiving that exact card today and would love to flash it with the highest voltage possible nowadays (1.33V?).

Thank you!

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It's at 760 core and 1.33v, this is the highest voltage i can get software based. :)

Quote:

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Originally Posted by oohms

Info on changing the checksum:
http://www.xtremesystems.org/forums/...&postcount=134

So, is there a 3850 512mb bios that doesn't have a clock limit? I looked around but can't seem to find a definite answer

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I dont quite get that....I compared 2 working yet different bios's and they didnt have anything different in their "connect power cord" section...
Are they talking about the only 2 zeros in the first part of that section?
if thats the case then....what if the difference of checksums is > than 3 hex characters....which mine were...where do I put them?
CONFUSED! lol

Quote:

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Originally Posted by os008

It's at 760 core and 1.33v, this is the highest voltage i can get software based. :)

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Excellent. I successfully flashed my HIS 3850 IceQ3 Turbo with that bios. Thanks!

Before the bios flash I could manage a stable 800 MHz GPU @ 51-52 degrees with the IceQ fan at 100% and 1026 MHz memory. Now I can run at 823 MHz GPU @ 54-55 degrees and again 1026 mem. A 23 MHz gain for about 0.1V... not that great imo - needs more juice. I'm also a bit surprised that the memory has toped out at a relatively low 1026, I'll eventually check what kind of ram chips they are. So far it's a great card for 199$ CAD. :D

i seem to have 1.35vgpu default with my club3d 3850 512mb... if anybody wants the bios lmk :)

Quote:

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Originally Posted by GenTarkin

I dont quite get that....I compared 2 working yet different bios's and they didnt have anything different in their "connect power cord" section...

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If you open the HxDen program i posted before, you'll find a menu called Analyze, then there's a Checksum window, if you open it and choose 16, then press ok, you'll get a checksum number at the bottom of the screen for this file (do it on YOUR default BIOS BEFORE changing anything).

Mine gives me A400, then i changed the frequency, and redid the checksum thing, so it gave me A600, now open up the windows Calculator, switch to Scientific, then Hex, put in A600 then subtract A400, you'll get 200, that's what you want to subtract from the file anywhere.

As you don't want to mess the file up, so you'll just goto the only part you're sure 100&#37; is trash (the connect your cable part, only words on the screen when used), and start overwriting it a bit by bit, put 00 at the beginning of it, then recalculate the checksum, and so on until you get a number close to A400 again, let's say after some 00 replacements you got A3D4, then subtract it from A400, you'll get 2C, replace one of the 00 you put in with 2C, voila, your correct checksum.

As usual, my tutorial sucks, and is long for no reason, but works :P, i re-flashed my BIOS without the -f parameter, and it worked.

Thanks oohms, for pointing out the thread :).

Quote:

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Originally Posted by Rick Hunter

Excellent. I successfully flashed my HIS 3850 IceQ3 Turbo with that bios. Thanks! ...

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No problem.

I heard that Qimonda are burning out at higher than 2000, is that true, i'm not sure if yours are that brand or Samsung, but better check it out, or just keep it at 2000 for now.

This is Stilt's BIOS modified for Jimmy, attachments aren't allowed in PMs, so i'm posting it here (checksum at A400 by the way, which is correct on MY card) ...

<removed cause of wrong frequency>

Hey guys, I have an HIS 3870 Iceq3 turboX 512mb version that clocks at 735/980 default. It's a beautiful blue card that matches my UV purple computer.. hated that red ATi color since it was the only thing that didnt go with it.

Sometimes it locks up with a white screen in 2-D mode, so I have to keep it overclocked in 3-D mode all the time via Rivatuner to prevent switching between 2-D and 3-D low performance. Even when overclocking is disabled, it still crashes once a day when doing intensive 2-D tasks like scrolling down this page or moving a window around. When I do that, it actually uses up to 50&#37; of the GPU as shown in CCC and Rivatuner, and the card instantly clocks up to 3D low perf. mode for a second or two and then switches back to 300MHz idle mode. The switching could happen quite frequently back and forth.. that never happened with my X1900XTX (it would stay in 2D mode unless I fired up a 3-D application). I guess ATI is trying harder to push low-power consumption in 2-D... Perhaps the 2-D voltage is too low or the voltage ripple changes from frequent switching goes too high or too low?

Anyway, I can overclock it to 755 core/ 1040 memory while it's absolutely stable in all 3-D applications. There aren't any ATItool artifacts until I go up to 800/1050 but it crashes in games like Quake3 with Vsync disabled and bringing down the console command (by pressing ~). I think that this method (Q3A console) is the quickest way to test your GPU stability since it was best at finding GPU errors on all of my previous video cards (6800Ultra, X800XT, etc..). Strangely, ATI's own CCC overdrive auto o/c tool pushes my card all the way to 860 Mhz before it artifacts all over the screen... USELESS!!!

If you guys want my TurboX 735/980 Bios, I'd be happy to upload it here. I'll do that anyway because I do not know how to edit the BIOS voltage and would love to be able to overclock it higher than 750 core.

Quote:

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Originally Posted by os008

This is Stilt's BIOS modified for Jimmy, attachments aren't allowed in PMs, so i'm posting it here (checksum at A400 by the way, which is correct on MY card) ...

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ooops memory at 99 mhz instead of 990. had to flash back.can you fix it for me and others? btw your work and guides are much appreciated.:up:

No problem Jimmy, sorry about that mistake, sometimes i set frequency at a lower rate cause i miss a zero when i write it in my calculator, but i never set it higher don't worry (too sure because of the Checksum, will be too high if i set the frequency too high, though i should have suspected when the checksum was so low :rolleyes: :down: :p:)

<removed the BIOS, yet again, cause of my faulty mathematics>

Here's the HIS 3870 Iceq3 turboX 512mb BIOS extracted by Winflash..

It's default at 735/1960 and I do not know the voltages... I have a multimeter but it's too far inside of my case for me to measure without shorting something on my motherboard or getting all tangled up in the wires.

Well, could somebody pleeeeeeeeeease mod the voltages in this bios so that it's 1.327v (also with higher 2-D idle voltage same as HD3870)? thanks a million and i cant wait!!!

Quote:

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Originally Posted by os008

No problem Jimmy, sorry about that mistake, sometimes i set frequency at a lower rate cause i miss a zero when i write it in my calculator, but i never set it higher don't worry (too sure because of the Checksum, will be too high if i set the frequency too high, though i should have suspected when the checksum was so low :rolleyes: :down: :p:)

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nope same 99mhz memory again. please keep trying though.

Saaya have you created a new bios for your 3850 512mb card? I tried this but Im not very familiar with this kinda stuff and time to get it right is short for me, dang. Someone that has a good bios for OCing a 3850 512 mb card please post. I have one now that allows 760/1850. I need a bios to OC in CF I can use riva for one card and get great results but it wont work for CF.
O please, o please, LOL :)

Quote:

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Originally Posted by os008

....
It's at 760 core and 1.33v, this is the highest voltage i can get software based. :)

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The highest voldage that can get software based is 1.29V. Make a test, set the vcore to 1.29 and you will see no difference in the overclock betwen 1.33V.
Which resistor did you mod for higher voltage?
I put 0,974V in 2D Idle for lower temp. Lower values than that, gives more voltage.

Quote:

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Originally Posted by saaya

i seem to have 1.35vgpu default with my club3d 3850 512mb... if anybody wants the bios lmk :)

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Yes, I do want the BIOS, can you post it here please!

Quote:

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Originally Posted by Bo_Fox

Here's the HIS 3870 Iceq3 turboX 512mb BIOS extracted by Winflash..

It's default at 735/1960 and I do not know the voltages... I have a multimeter but it's too far inside of my case for me to measure without shorting something on my motherboard or getting all tangled up in the wires.

Well, could somebody pleeeeeeeeeease mod the voltages in this bios so that it's 1.327v (also with higher 2-D idle voltage same as HD3870)? thanks a million and i cant wait!!!

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attached,
his3850-512@735/1960, voltmoded 2d@1.24 / 3D@1.33v
i have tested it with atiflash, atiwinflash doesnt work for me.:confused:

OK, this is the last one, if it doesn't work, then i dont' know what else to do :p:.

@Chuk
I hard volt-modded to get past 800, not using a volt-modded BIOS!


EDIT: stroke, i fixed the checksum for you, check if it will work, the checksum is for the 256 version, but i noticed that even if you set it for 3870 it will still work, as long as it's a known card it seems!

Wow that was quick.. are you really sure that it will work? There is still 1 instance of 1.214v in there and 5 instances of 1.014v for low-power 2D.

I'm real nervous because I've never flashed a GPU BIOS before!!! I've done hardware volt-modding on my 9800Pro 3 years ago and that was it...

Quote:

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Originally Posted by the-strokes

attached,
his3850-512@735/1960, voltmoded 2d@1.24 / 3D@1.33v
i have tested it with atiflash, atiwinflash doesnt work for me.:confused:

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Also, thank you. :)

Quote:

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Originally Posted by the-strokes

attached,
his3850-512@735/1960, voltmoded 2d@1.24 / 3D@1.33v
i have tested it with atiflash, atiwinflash doesnt work for me.:confused:

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can you please mod my bios with 1.33v 3d?
i don't really care about changing the clocks, but if it's not too much trouble make it @ 750/950:)

thanx:)

Quote:

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Originally Posted by spectrum48

can you please mod my bios with 1.33v 3d?
i don't really care about changing the clocks, but if it's not too much trouble make it @ 750/950:)

thanx:)

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Yah I could use that too! :clap: :D

I just did a hex compare and it looks great.. but I edited the checksum part so that it has the exact same checksum and I wont have to "force" flash.

Off to flashing.. be back shortly, with my fingers crossed!!!!!

Gigabyte 3850 1.37V Load (1.289V form BIOS, 1.63KOhm vGPU Mod), 1.04 Idle. Accelero S1 + 2x92mm Arctic cooling 12V 1.0A very quiet.

http://img87.imageshack.us/img87/9376/8171107rt1.th.jpg

http://img87.imageshack.us/img87/4285/atitoolcu0.th.jpg

http://img87.imageshack.us/img87/9092/furnf0.th.jpg

YES, it works!!!!!! THANK YOU SO MUCH, the-strokes and everybody else who provided useful info. on the forums!

Now my IceQ3 card can do 836 Mhz artifact-free in ATiTool and 800 MHz stable so far in games.

IMHO, the quickest way to test true stability of your card is to start Quake 3 and enter console mode by pressing ~ (tilde) and then type timedemo 1. That will remove the 90fps cap but make sure you have Vsync disabled. With the latest Q3 patch, it will also utilize two CPU's at exactly 100&#37; load each. My GPU is also being loaded at 99.99% at an average of 850fps. You can see the red transparent textures sliding over each other -- and you would easily be able to detect artifacts.

Also, another hint is to disable ATI VPU recover! If the card detects any core artifacting within games (doesn't apply for ATiTool as well), it will just crash or mess up your system. If it's o/c'ed way too high, just let it reboot anyway.

Quake 3, press ~ then type timedemo1 and do nothing for 5+ minutes (Vsync must be disabled)--
ONE OF THE QUICKEST STABILITY TESTS FOR YOUR GPU!!!

So, if you have that old Q3 game laying around or installed in your rig, you can still make very good use out of it.. so far, no other game have tested my GPU stability as quickly!!! If it could do 10-15 minutes of that, then you can be 98% sure that it will be perfectly stable for any other games--Crysis included. If it's just a tiny bit over the limit, Q3 will instantly crash in less than 2 minutes while I could do 3DMark06 or Lost Planet loops over and over...

Quote:

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Originally Posted by os008

OK, this is the last one, if it doesn't work, then i dont' know what else to do :p:.

@Chuk
I hard volt-modded to get past 800, not using a volt-modded BIOS!


EDIT: stroke, i fixed the checksum for you, check if it will work, the checksum is for the 256 version, but i noticed that even if you set it for 3870 it will still work, as long as it's a known card it seems!

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there you go, now it works , not to nit pick but ha anyone figured out why ccc overdrive won't work with these bios's? with the one denny posted i was able to clock up to 900 the modded bios's top at 730? there must be some section of the bios which tells overdrive what the speed is.

the reason i need a high core is that is the easiest way to clock second card. when i had denny's bios it allowed 900 but was a .67 bios with max at 865mhz. both of my cards are v-modded and watercooled and I need to be able to clock to 1000. so far riva maxes for me at 999 actual and either card can do that, just cannot do it in crossfire:shakes:

I have an GeCube Radeon HD 3850 X-Turbo III ... can I use this modified HIS bios or do I need a modded bios version of my own card?

Hold on, I'll upload mine with fixed checksum in a few minutes... works perfectly fine in all games and benchmarks (gave me a 50 Mhz boost on core) thanks to 3870 voltage.

ok we are waiting....

witch card do you have ?

Quote:

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Originally Posted by jimmyz

anyone figured out why ccc overdrive won't work with these bios's? with the one denny posted i was able to clock up to 900 the modded bios's top at 730? there must be some section of the bios which tells overdrive what the speed is.

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Can you please point at the post that he posted that BIOS, i'll compare it to the original and try to figure out the differences, cause i also want to know how to get Overdrive to work with a modded BIOS!

os008, bo_fox, spectrum : thx for sharing ur bios..:toast:

heres sapphire 3850 512, 2D@1,24, 3D @1,33..cheksum's already equal.
didnt change the clocks, u can try to modifiy them if u like, 0s008 have the guide and tools for bios mod here :)

Quote:

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Originally Posted by os008

Can you please point at the post that he posted that BIOS, i'll compare it to the original and try to figure out the differences, cause i also want to know how to get Overdrive to work with a modded BIOS!

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I think it is due to the voltage-lookup tables that ATI uses with the 38xx series (that's why voltage cannot be changed as easily in software like with X19xx series). I heard that when overclocking, Overdrive slightly bumps the voltage by miniscule amounts that hardly help at all, like by 0.005v increments or something like that (cant remember where I got the info..). For all 3850 cards, there is a specific voltage to be expected by the drivers and if they do not match, it wont work, as I have recently confirmed.

However, Rivatuner still works with overclocking, which is a big :up: .

With HIS default bios, CCC allows me to slide it all the way to 900 MHz core and insane memory speeds. So here it is again, with a different filename this time.. It "should" be overclockable using CCC since this bios is default and unchanged. Also, the official speed in the hex editor is 736/982, not 735/980.

Description:
HIS Radeon HD 3850 IceQ3 TurboX 512MB 736/982 default clocks
ATI's CCC sliders maximum of 900MHz core and 1100 MHz memory
DEFAULT BIOS

And here is the modded bios from the same one in my last post, but with 3870 voltages. It is the same as the one that the-strokes edited for me, but I fixed the checksum so that it's exactly the same as default (no need to 'force' flash).

(Keep in mind that it does not allow for overclocking within CCC but can be overclocked just fine using Rivatuner). This one gave me a 50Mhz stable core boost over the default one.

Description:
HIS Radeon HD 3850 IceQ3 TurboX 512MB 736/982 default clocks
MODDED BIOS WITH 3870 voltage (2-D: 1.241v, 3-D: 1.327v)

Quote:

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Originally Posted by the-strokes

os008, bo_fox, spectrum : thx for sharing ur bios..:toast:

heres sapphire 3850 512, 2D@1,24, 3D @1,33..cheksum's already equal.
didnt change the clocks, u can try to modifiy them if u like, 0s008 have the guide and tools for bios mod here :)

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i can't thank you enough mate:up: :worship:

i'm going to try and test it now:)

:( no go mate, the multimeter still says 1.22v 3d:(

also 0s088's guide doesn't explain anything, just gives examples
for instance, how do i know which are the values for mem clocks and how many of these values shoul i change:confused:

edited: i'm an idiot and in need of sleep, sorry for the spam:(

Quote:

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Originally Posted by Bo_Fox

With HIS default bios, CCC allows me to slide it all the way to 900 MHz core and insane memory speeds. So here it is again, with a different filename this time..

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I found the part that changes the Overdrive limits, when i changed it, CCC didn't recognise my card, as if i didn't install a driver!

anyone know why atiwinflash doesn't want to flash the mod bios?

i load the file, but it says 'VBIOS image not found':shrug:

i tried renaming it, i even made a copy with the new voltages myself but it won't flash it

Use atiflash from USB drive, I cant get aitwinflash to work either.

Quote:

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Originally Posted by Eldonko

Use atiflash from USB drive, I cant get aitwinflash to work either.

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works perfect for me. but i don't force flash so the bios needs to be compatible or i get the same message

Wow haven't checked up on 3850 related bios info and see all that has been happening here...

question can you change the default fan speed from bios on 512mb HD3850s ?

Quote:

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Originally Posted by the-strokes

heres sapphire 3850 512, 2D@1,24, 3D @1,33..cheksum's already equal.
didnt change the clocks, u can try to modifiy them if u like, 0s008 have the guide and tools for bios mod here :)

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Got me 32 extra Mhz on core, thanks! :up:

There is no senese for using 1.24V for 300MHz in 2D. It's much better to use 0.974V for lower temp in Idle.