Sapphire HD4850 Bios Modded, Core upper Limit to 850Mhz in CCC!

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08-03-2008, 10:06 PM
leonarderman

Sapphire HD4850 Bios Modded, Core upper Limit to 850Mhz in CCC!

I have modded sapphire Bios, GPU Core upper limit to 850MHz, memory upper limit to 1300MHz. You can download here. Try and Good luck! :D

I - HD4850 Bios (Modded by Leonarderman).

1. Sapphire HD4850 Hard Overclocked. DF Core 750MHz Mem 1100MHz Auto Cool Fan.
GPU Core upper Limit 850MHz
Memory Upper limit 1300MHz
Vcore Modded to 1.327V for higher Overclocking.

Sapphire HD4850 Hard Overclocked

2. Sapphire HD4850 Light Overclocked. DF Core 700MHz Mem 1000MHz Auto Cool Fan.
GPU Core upper Limit 850MHz
Memory Upper limit 1300MHz
Vcore DF 1.12V

Sapphire HD4850 light Overclocked

3. Asus HD4850 Light Overclocked. DF Core 700MHz Mem 1100MHz Auto Cool Fan.
GPU Core upper Limit 1200MHz
Memory Upper limit 1400MHz
Vcore DF 1.12V

Asus HD4850 Light Overclocked

4. Sapphire HD4850 Toxic. DF Core 675MHz Mem 1150MHz Auto Cool Fan.
GPU Core upper Limit 700MHz
Memory Upper limit 1200MHz
Vcore DF 1.12V

Sapphire HD4850 Toxic

You should create an USB Bootable to Dos. You can make it from the guide here:

http://www.thepcspy.com/read/bootable_usb_flash_drive

Then you have to copy ATIFlash programs 3.6 (download below) or newer (Dos) and Bios file to USB Disk. Try it done! :D

http://www.techpowerup.com/downloads...lash_3.60.html

Please note: Updating by ATIFlash 3.6 or newer (Dos), don't try to use ATI WinFlash, because I found the problem from bios file maked by RBE1.12! :)
08-03-2008, 10:25 PM
GAR

do you actually get 1.327 from bios mod???
08-04-2008, 12:24 AM
gurusan

how did you change the CCC limit?
08-04-2008, 01:17 AM
leonarderman

Quote:

Originally Posted by gurusan

how did you change the CCC limit?

I had modified Bios by Hexeditor! :D

@ GAR: Yes! It work good!
08-04-2008, 03:38 AM
gurusan

atiflash tells me its an invalid bios image....
08-04-2008, 04:26 AM
purecain

well i hope this voltage increase through the bios is accurate... should inspire some research into getting the 4870 volts up aswell...

everyone has been saying that upping the voltage through the bios doesnt work...
08-04-2008, 07:54 AM
GAR

can someone check with a DMM to see if the voltage change actually works??? if it does that would be amazing.
08-04-2008, 09:21 AM
Kinshou Kuma

Ok am willing to fry a 4850 when I get home.
Anyone else trying these.
08-04-2008, 09:47 AM
HousERaT

Voltage above 1.2v via bios? I'm not buying it till I see some proof.

Is this bios from a card with Samsung memory?
08-04-2008, 10:56 AM
GAR

I tried this bios with no luck, 750 locked up COD4 within 1 minute, i dont think 1.3v through bios is possible. We need some hard proof with a pic of a dmm showing 1.3v
08-04-2008, 11:28 AM
HousERaT

Quote:

Originally Posted by GAR

I tried this bios with no luck, 750 locked up COD4 within 1 minute, i dont think 1.3v through bios is possible. We need some hard proof with a pic of a dmm showing 1.3v

Does the bios allow for the extended range in CCC? Got a screenshot?
08-04-2008, 12:18 PM
jimmyz

Quote:

Originally Posted by HousERaT

Does the bios allow for the extended range in CCC? Got a screenshot?

I have a working unlocked bios, right now i have a 4870 and a 4850 bios both with the limits raised. I will need some testing (flashing back to stock and reflashing etc). so far it works fine in XP Pro and Vista 64bit ultimate. so stay tuned.

as to the voltage, the bios can only raise 4850's to around 1.21 the controllers physical limit, IMO not worth the effort. there are many pages in the volt mod thread to show how to get steady reliable voltage as high as 1.6+. and also several pencil mods to get a nice bump over stock if soldering is not your thing.

[IMG]http://img212.imageshack.us/img212/7...biosmodda2.jpg[/IMG]
08-04-2008, 01:37 PM
HousERaT

I look forward to your bios Jimmyz :)
08-04-2008, 04:23 PM
Mysterfix

Quote:

Originally Posted by HousERaT

I look forward to your bios Jimmyz :)

Me too, the one's at the top of the page work ok but the CCC limit is 850mhz on the core.
08-04-2008, 06:09 PM
awdrifter

Will this bios work for the Asus version of the 4850? Thanks in advance.
08-04-2008, 06:48 PM
leonarderman

Quote:

Originally Posted by GAR

I tried this bios with no luck, 750 locked up COD4 within 1 minute, i dont think 1.3v through bios is possible. We need some hard proof with a pic of a dmm showing 1.3v

Well! I'm sorry! I have test Hard overclocked Bios with HD4850 + Zalman VF900, it work good, but I don't care about your HD4850.

I think you should try light Overclocked Bios to get another result! Good luck! ;)
08-04-2008, 06:53 PM
leonarderman

Quote:

Originally Posted by Mysterfix

Me too, the one's at the top of the page work ok but the CCC limit is 850mhz on the core.

I can modify Upper limit to over 1000MHz, but I think it's no needed because you have to mod Vcore to 1,6V to get GPU core over 1000MHz. It's hard modded! :rolleyes:

If you want, I'll send to you new Bios Upper limit to 1500MHz :D
08-04-2008, 07:49 PM
Mysterfix

Quote:

Originally Posted by leonarderman

I can modify Upper limit to over 1000MHz, but I think it's no needed because you have to mod Vcore to 1,6V to get GPU core over 1000MHz. It's hard modded! :rolleyes:

If you want, I'll send to you new Bios Upper limit to 1500MHz :D

That would be nice since I already have the cards hard modded with vr's for the voltage. Just waiting on another waterblock before I really start to push them.
08-05-2008, 01:38 AM
AgentGOD

Anyone try the "Hard overclocked" BIOS on the stock cooler yet? I'm hesitant to flash it since I have a Visiontek card, and I'm on the stock cooler.
08-05-2008, 04:41 AM
ultimate11

Quote:

Originally Posted by awdrifter

Will this bios work for the Asus version of the 4850? Thanks in advance.

dont even think about it :)
08-05-2008, 07:00 AM
regenade

so no guinea pigs to test the Toxic 4850 bios on the reference Quimonda memory based HD 4850s :P
08-05-2008, 07:34 AM
MadMikeSS

Well, I tried the hard overclock bios and now the light. My HIS 4850 seems to have a limit on the core which is why I dropped to the light clocked bios. I wasn't able to step back down from 750 through CCC with the hard clocked version. I am also running into a problem with drivers. I have tried to install the 8.8 betas that came out and it doesn't recognize that I have a valid ATI card. 8.7's seem to be fine though having also the upper limits as stated for the bios.
08-05-2008, 07:36 AM
MadMikeSS

Quote:

Originally Posted by regenade

so no guinea pigs to test the Toxic 4850 bios on the reference Quimonda memory based HD 4850s :P

Send it. :) I'd try it.
08-05-2008, 09:28 AM
AgentGOD

Quote:

Originally Posted by AgentGOD

Anyone try the "Hard overclocked" BIOS on the stock cooler yet? I'm hesitant to flash it since I have a Visiontek card, and I'm on the stock cooler.

?????????
08-05-2008, 09:54 AM
leonarderman

I have updated new Bios. You can try another Bios to get more Result! Good luck! :D
08-05-2008, 09:55 AM
MadMikeSS

Anyone wanna mod my HIS HD4850 bios to increase my upper limit to around 800/1300?

This is a capture of my stock bios: HIS 4850 Stock Bios
08-05-2008, 10:09 AM
sarmat

Hi.

As I see, there is a possibility to raise Overdrive limits in BIOS. Why do you modifying old BIOSes (1.0003)? Please, raise up limits to 800/1300 in new 1.0004 BIOS from PowerColor/Sapphire and release it with checksum fixed if that's possible. Please don't change anything else (including fan settings) - only limits. I need this BIOS in this form. Thanks in advance.

Regards,
sarmat.
08-05-2008, 11:12 AM
leonarderman

Quote:

Originally Posted by sarmat

Hi.

As I see, there is a possibility to raise Overdrive limits in BIOS. Why do you modifying old BIOSes (1.0003)? Please, raise up limits to 800/1300 in new 1.0004 BIOS from PowerColor/Sapphire and release it with checksum fixed if that's possible. Please don't change anything else (including fan settings) - only limits. I need this BIOS in this form. Thanks in advance.

Regards,
sarmat.

Here is your Bios: Power Color

I have changed Core upper limit to 1250MHz and memory upper limit 1450MHz
And I don't change anything else!

Good luck! ;)
08-05-2008, 12:03 PM
MadMikeSS

Quote:

Originally Posted by leonarderman

Here is your Bios: Power Color

I have changed Core upper limit to 1250MHz and memory upper limit 1450MHz
And I don't change anything else!

Good luck! ;)

leonarderman, you think you can mod my HIS bios just for increased upper limit of around 800/1300.
08-05-2008, 12:09 PM
Azh_fx

any chance of modding the bios Power Color and making it so 3d clocks = 1.2v 700/1000

have you tried using powerplay settings 160/500 in 2d? or is that a bit complicated

cheers :welcome:
08-05-2008, 12:33 PM
gurusan

Quote:

Originally Posted by leonarderman

Here is your Bios: Power Color

I have changed Core upper limit to 1250MHz and memory upper limit 1450MHz
And I don't change anything else!

Good luck! ;)

All of these bioses say invalid bios image when I try to flash with atiflash?
08-05-2008, 12:51 PM
Mysterfix

Quote:

Originally Posted by gurusan

All of these bioses say invalid bios image when I try to flash with atiflash?

Have you tried renamimg the files to .rom instead .bin?
08-05-2008, 01:03 PM
gurusan

just tried that and no worky.

Also just tried using winflash and it says vbios not found.

leonarderman are you sure you got the checksums right?
08-05-2008, 01:12 PM
Mysterfix

It works for me on vista 64, are you using XP, because if you are you have to change the file extension so it shows up as a rom file and not a bin file.
08-05-2008, 01:13 PM
MadMikeSS

I was able to flash his bios' no problem, but the one problem I have run into so far is that if I try to install the CAT 8.8 betas it won't recognize my card as a valid ATI card. The CAT 8.7's work fine though and didn't give me a problem. Which is why I'd like to have my own card's bios modded just slightly without messing with the checksums.
08-05-2008, 01:18 PM
MadMikeSS

Quote:

Originally Posted by gurusan

just tried that and no worky.

Also just tried using winflash and it says vbios not found.

leonarderman are you sure you got the checksums right?

Have you tried atiflash from dos with -p -f 0 [bios.bin]?
08-05-2008, 01:44 PM
gurusan

Quote:

Originally Posted by MadMikeSS

Have you tried atiflash from dos with -p -f 0 [bios.bin]?

yeah that was it, i just had to force it. :/

thanks
08-05-2008, 01:45 PM
MadMikeSS

Cool, good that that worked out. Hope you don't run into the driver issues like I have.
08-05-2008, 02:19 PM
regenade

Same issue with catalyst 8.8 beta in my XP install....the catalyst 8.7 on my Vista worked fine :(
Its like a similar issue with 8.7 beta where modded bios didn't work...any ideas guys?
08-05-2008, 02:31 PM
Mysterfix

Well I tried both the asus and the powercolor but neither one are working with my cards. After I reboot I get no signal from either card with these bios. Had to go back to my original, the saphire one's work but I couldn't change any of the overdrive settings for some reason. Anybody else having this problem?

Edit: I've got a Diamond and a Powercolor
08-05-2008, 03:05 PM
H3llSp4wN

hello.

when i flash my gigabyte card with the powercolor bios, it sais that doesn't recognizes it. :confused:

can anybody please change the CCC limits on my gigabyte bios file?

Here it is -> http://rapidshare.com/files/13513562...e4850.rom.html

Sorry for my bad english.

thank's
08-05-2008, 05:44 PM
awdrifter

Quote:

Originally Posted by ultimate11

dont even think about it :)

Does anyone have a modded Asus 4850 bios then?
08-06-2008, 12:20 AM
leonarderman

Quote:

Originally Posted by awdrifter

Does anyone have a modded Asus 4850 bios then?

Here is your Bios: :D

3. Asus HD4850 Light Overclocked. DF Core 700MHz Mem 1100MHz Auto Cool Fan.
GPU Core upper Limit 1200MHz
Memory Upper limit 1400MHz
Vcore DF 1.12V no modded

Asus HD4850 Light Overclocked
08-06-2008, 12:26 AM
leonarderman

Quote:

Originally Posted by H3llSp4wN

hello.

when i flash my gigabyte card with the powercolor bios, it sais that doesn't recognizes it. :confused:

can anybody please change the CCC limits on my gigabyte bios file?

Here it is -> http://rapidshare.com/files/13513562...e4850.rom.html

Sorry for my bad english.

thank's

Your Gigabyte HD4850 Bios here: Gigabyte HD4850 Bios Modded

Core upper Limit 950MHz
Memory Upper limit 1400Mhz

Please update with Atiflash 3.6 or newer (Dos)

Try to Done! :rolleyes:
08-06-2008, 02:47 AM
ken

Quote:

Originally Posted by leonarderman

Here is your Bios: :D

3. Asus HD4850 Light Overclocked. DF Core 700MHz Mem 1100MHz Auto Cool Fan.
GPU Core upper Limit 1200MHz
Memory Upper limit 1400MHz
Vcore DF 1.12V no modded

Asus HD4850 Light Overclocked

can you do this with the vmod applied? my card needs more than the default voltage to get 700Mhz stable :p
08-06-2008, 03:28 AM
leonarderman

Quote:

Originally Posted by ken

can you do this with the vmod applied? my card needs more than the default voltage to get 700Mhz stable :p

With the Bios default:
Idle: 1.12V
Fulload: 1.263V

Bios Modded able to change Vcore max to 1.327V. Mod more Volt take no effect!

But I think the card HD4850 is easy stable at core 700Mhz with vcore df. With my Sapphire HD4850, I can overclock core to 750Mhz stable easily! Try again or mod Vcore by Pencil to get more result! ;)
08-06-2008, 03:35 AM
ken

Quote:

Originally Posted by leonarderman

With the Bios default:
Idle: 1.12V
Fulload: 1.263V

Bios Modded able to change Vcore max to 1.327V. Mod more Volt take no effect!

But I think the card HD4850 is easy stable at core 700Mhz with vcore df. With my Sapphire HD4850, I can overclock core to 750Mhz stable easily! Try again or mod Vcore by Pencil to get more result! ;)

now im confused :p Does it bios come with the soft-vmod applied (to get around 1.2v underload) or not? the default voltage for the HD4850 is around 1.13v underload :)

p/s: nevermind, I opened the bios file in RBE, it seems that soft-vmod is not applied then :)
08-06-2008, 05:56 AM
MadMikeSS

Quote:

Originally Posted by leonarderman

With the Bios default:
Idle: 1.12V
Fulload: 1.263V

Bios Modded able to change Vcore max to 1.327V. Mod more Volt take no effect!

But I think the card HD4850 is easy stable at core 700Mhz with vcore df. With my Sapphire HD4850, I can overclock core to 750Mhz stable easily! Try again or mod Vcore by Pencil to get more result! ;)

leonarderman, do you think you could mod my HIS bios? I have it linked in a post at the beginning of page 2.
Thanks.
08-06-2008, 05:56 AM
Mysterfix

Can you mod my original bios and change only the upper limits please? DiamondHD4850.bin :up:
08-06-2008, 06:26 AM
drizzt5

Quote:

Originally Posted by leonarderman

Here is your Bios: :D

3. Asus HD4850 Light Overclocked. DF Core 700MHz Mem 1100MHz Auto Cool Fan.
GPU Core upper Limit 1200MHz
Memory Upper limit 1400MHz
Vcore DF 1.12V no modded

Asus HD4850 Light Overclocked

Quote:

Originally Posted by leonarderman

With the Bios default:
Idle: 1.12V
Fulload: 1.263V

Bios Modded able to change Vcore max to 1.327V. Mod more Volt take no effect!

But I think the card HD4850 is easy stable at core 700Mhz with vcore df. With my Sapphire HD4850, I can overclock core to 750Mhz stable easily! Try again or mod Vcore by Pencil to get more result! ;)

So wait... If I flash my asus 4850 with this. It will be default clocks of 700/1100, but it will have a vcore max of 1.327v's? Meaning I could quite possibly with the proper cooling get it to 800 core? :/
08-06-2008, 06:50 AM
Mysterfix

Quote:

Originally Posted by drizzt5

So wait... If I flash my asus 4850 with this. It will be default clocks of 700/1100, but it will have a vcore max of 1.327v's? Meaning I could quite possibly with the proper cooling get it to 800 core? :/

Yes, if the voltage is able to go up to the max of 1.327v set in bios then you could get the core upto around 850mhz.
08-06-2008, 08:32 AM
drizzt5

With just a bios flash.... wow....

Now I really really need to read up on it. Do I need a multimeter for a bios flash like I need for a pencil mod or volt mod? Because I don't have one on hand.
08-06-2008, 09:27 AM
Mysterfix

To be honest I don't know if the 1.327v bios mod actually works, my cards are hard modded so you'll have to waite for Leonarderman to chime in.
08-06-2008, 09:31 AM
drizzt5

Oh, it kind of sounds too easy to be true :/
08-06-2008, 09:56 AM
awdrifter

Quote:

Originally Posted by leonarderman

Here is your Bios: :D

3. Asus HD4850 Light Overclocked. DF Core 700MHz Mem 1100MHz Auto Cool Fan.
GPU Core upper Limit 1200MHz
Memory Upper limit 1400MHz
Vcore DF 1.12V no modded

Asus HD4850 Light Overclocked

Thank you, the card should be here tonight, I will definitely try it out. :up:
08-06-2008, 10:35 AM
ken

Quote:

Originally Posted by drizzt5

So wait... If I flash my asus 4850 with this. It will be default clocks of 700/1100, but it will have a vcore max of 1.327v's? Meaning I could quite possibly with the proper cooling get it to 800 core? :/

nah, you would get around 1.2v at best. anything higher than that would need pencil/hardmod.

my Asus HD4850 needs around 1.28v to do 800MHz stable btw :)
08-06-2008, 11:10 AM
drizzt5

oh, so is it not worth doing a bios mod?
08-06-2008, 11:14 AM
ken

Quote:

Originally Posted by drizzt5

oh, so is it not worth doing a bios mod?

it still worth it if you want the higher limit in the CCC Overdrive and little extra voltage (1.13v => 1.2v-ish) for overclocking. Im not sure if the one from leonarderman already has the soft-mod done though :p
08-06-2008, 11:23 AM
drizzt5

Ok, what I will do is OC as high as I can with no mod's. I need to be told how to do the rest of this stuff afterwards though :P
http://www.xtremesystems.org/forums/...68#post3195868
Could you help me out please?
08-06-2008, 07:08 PM
leonarderman

Please note: Don't try to use Pencil mod if you don't have a better cooler (Water cooling is best for use). Because pencil mod can give vcore 1,4V - it'll make your HD4850 card too hot. I tried with my Sapphire HD4850 Toxic + Zalman VF900, it's so hot that I can't Overclock GPU core more than 815MHz.

Quote:

leonarderman, do you think you could mod my HIS bios? I have it linked in a post at the beginning of page 2.
Thanks.

Here's your HIS HD4850 Bios file: HIS HD4850 Bios Modded
Core Upper limit 800MHz
Mem upper limit 1300MHz

Quote:

Can you mod my original bios and change only the upper limits please? DiamondHD4850.bin

Here's your Diamond HD4850 Bios file: HIS HD4850 Bios Modded
Core Upper limit 950MHz
Mem upper limit 1400MHz
08-06-2008, 07:12 PM
Mysterfix

Thanks bro.
08-06-2008, 07:19 PM
leonarderman

You should create an USB Bootable to Dos. You can make it from the guide here:

http://www.thepcspy.com/read/bootable_usb_flash_drive

Then you have to copy ATIFlash programs 3.6 (download below) or newer (Dos) and Bios file to USB Disk. Try it done! :D

http://www.techpowerup.com/downloads...lash_3.60.html

Please note: Updating by ATIFlash 3.6 or newer (Dos), don't try to use ATI WinFlash, because I found the problem from bios file maked by RBE1.12 - ATI Winflash can't open bios file maked by RBE1.12! :)
08-06-2008, 07:48 PM
MadMikeSS

Quote:

Originally Posted by leonarderman

Here's your HIS HD4850 Bios file: HIS HD4850 Bios Modded
Core Upper limit 800MHz
Mem upper limit 1300MHz

Thanks bud, you are the man.
08-06-2008, 09:37 PM
BulldogPO

Please, do one for MSI HD4850 also :)
08-06-2008, 09:51 PM
Factotum

leonarderman
May be You can write "How to" with pictures for All, pls
08-06-2008, 11:11 PM
Factotum

yes, i'm do it. I convert in calcularor 70000 (Dec)-> 11170 (Hex)
open bios in winhex end find hex value 701101 - i'm find a value
edit 701101 (700MHz) -> 187301 (950MHz), check checksum and save bios
RBE say what clock upper limit set to 950MHz :rehab: :rehab: :rehab:
i'm flashing the bios nice, but catalist 8.8 don'd work with bios :down:
08-06-2008, 11:18 PM
leonarderman

Quote:

Originally Posted by Factotum

yes, i'm do it. I convert in calcularor 70000 (Dec)-> 11170 (Hex)
open bios in winhex end find hex value 701101 - i'm find a value
edit 701101 (700MHz) -> 187301 (950MHz), check checksum and save bios
RBE say what clock upper limit set to 950MHz :rehab: :rehab: :rehab:
i'm flashing the bios nice, but catalist 8.8 don'd work with bios :down:

Yes! Catalyst 8.8 can't Overclock card with ATI Overdrive, you should OC with AMD GPU Tool. :D
08-06-2008, 11:27 PM
STEvil

Why so many different limits and versions?

Just open them up to a high value (1200 core+) but leave the volts/clocks at default.
08-06-2008, 11:31 PM
leonarderman

Quote:

Originally Posted by BulldogPO

Please, do one for MSI HD4850 also :)

Your MSI Bios modded here

Core upper limit 950Mhz
Mem upper limit 1400MHz

And I don't change anything else! :D

@ STEvil : do you thing you can overclock GPU HD4800 more than 1200MHz? The WR is 1050MHz with hard modded! I thing 950Mhz are enough! :D
08-06-2008, 11:33 PM
Factotum

Quote:

Originally Posted by leonarderman

Yes! Catalyst 8.8 can't Overclock card with ATI Overdrive, you should OC with AMD GPU Tool. :D

Catalist 8.7:
http://images.people.overclockers.ru/preview/162441.jpg
08-07-2008, 04:50 AM
drizzt5

I think my S1 + 120mm fan should be enough to get me a decent overclock.
08-07-2008, 06:45 AM
STEvil

Quote:

Originally Posted by leonarderman

Your MSI Bios modded here

Core upper limit 950Mhz
Mem upper limit 1400MHz

And I don't change anything else! :D

@ STEvil : do you thing you can overclock GPU HD4800 more than 1200MHz? The WR is 1050MHz with hard modded! I thing 950Mhz are enough! :D

If the WR is 1050 then 950 is not enough.

Edit - and i'm sure i've seen some at 1100.
08-07-2008, 08:54 AM
stingush

can some1 link me to the pencil mod?
08-07-2008, 09:32 AM
leonarderman

Quote:

Originally Posted by stingush

can some1 link me to the pencil mod?

It can be found here!
http://www.techpowerup.com/articles/...g/voltmods/151

@ STEvil: That's so good! Try to top WR. Good luck! :D

I could just overclock my to 815MHz with pencil Vcore modded. The card is so hot that I couldnot overclock more than that! Here is my result 3DMark Vantage Performace.

http://thienloipc.com/leonarderman/s...vantageoc3.jpg
08-07-2008, 09:52 AM
drizzt5

Thanks man, you used your bios mod + your pencil mod right?
08-07-2008, 09:59 AM
stingush

looks very good, think i'll use it next week :D
08-07-2008, 10:51 AM
Factotum

to leonarderman
what value you are looking for editing core voltage limit in bios?
1158 max voltage in bios, if it up - protection kick voltage. I want find value for protection
08-07-2008, 09:06 PM
jdrom

I just figured out how to do this myself. Not overly difficult but it took CanadaRox and I a bit to figure the number conversion.

Basically you take the decimal number you want, multiply it by 100 then convert it to hexadecimal. You then invert the hex and then enter it into the BIOS using a hex editor. I use UltraEdit myself.

Example:
1000MHz = 100000
100000 = 01 86 A0 (Hex)
Invert = A0 86 01
So you'd enter in A0 86 01 to get a 1000MHz limit.

To find the limit in the BIOS, you'd have to convert the limit to "inverted" hex and then search for it.

RBE shows the limit as being correctly increased but I've yet to flash the BIOS.

I did this to my HD4850 BIOS though the same principles apply to the HD4870 as well which CanadaRox has.

EDIT: Well I got 1000/1400 limits seemingly working, however CanadaRox is having problems with his HD4870. The core limit seemed to work but the memory appears to be an issue.
http://i85.photobucket.com/albums/k7...mit-raised.png
08-08-2008, 06:05 AM
HousERaT

Can someone with the skills put out a generic 4850 bios with high CCC limits (1200/1400) which also has a proper checksum?
08-08-2008, 12:58 PM
chri5g

leonarderman did NOT do checksum
Only WHQL driver work next 8.8 beta DID NOT work
08-08-2008, 04:08 PM
Factotum

2 Attachment(s)

I moded Sapphire HD4850 bios:
1. Upper limit GPU set to 950MHz
2. moded powerplay: in 3D set 1.158=1.21V (monitoring) - it's max value for Vgpu in bios. If value more than 1.158 - overprotection kick voltage to 1.1V in monitoring :(
http://images.people.overclockers.ru/162710.gif
3. fix a bios checksum. original bios
get it here
My bios work great with Catalist 8.7 in Windows XP and Vista x64, and don't work with catalist 8.8beta
Enjoy
08-08-2008, 06:58 PM
awdrifter

Quote:

Originally Posted by awdrifter

Thank you, the card should be here tonight, I will definitely try it out. :up:

I tried to flash the modded bios with Atiwinflash, but it gives me an error saying "VBIOS image not found" Anyone else have this problem? TIA.
08-08-2008, 08:58 PM
Mysterfix

Quote:

Originally Posted by awdrifter

I tried to flash the modded bios with Atiwinflash, but it gives me an error saying "VBIOS image not found" Anyone else have this problem? TIA.

Try renaming the file to something shorter like 4850.rom.
08-08-2008, 09:00 PM
leonarderman

Quote:

Originally Posted by chri5g

leonarderman did NOT do checksum
Only WHQL driver work next 8.8 beta DID NOT work

I'm sorry! I forgot to do it! I'll it it later. Now I'm very busy.
08-08-2008, 09:06 PM
leonarderman

Quote:

Originally Posted by awdrifter

I tried to flash the modded bios with Atiwinflash, but it gives me an error saying "VBIOS image not found" Anyone else have this problem? TIA.

Please note: I found the problem in ATI WinFlash with bios file maked by RBE1.12. Don't use ATI Winflash, please using ATIFlash 3.6 or newer (Dos)
08-08-2008, 09:18 PM
awdrifter

Ok, I will give that a try, thanks.

Edit: Just noticed that ATIflash is on dos, I think I'm going to wait for ATI Tools or ATI Tray Tools to support this card, last time I flashed a bios using floppy disk it ididn't end well. Did anyone tried the renaming trick with ATIwinflash? Did that work? But then I'm at 700/1100 with CCC Overdrive and fan mod, so I'm ok for now.

w00t, post 777!
08-09-2008, 07:22 AM
HKPolice

Quote:

Originally Posted by Factotum

I moded Sapphire HD4850 bios:
1. Upper limit GPU set to 950MHz
2. moded powerplay: in 3D set 1.158=1.21V (monitoring) - it's max value for Vgpu in bios. If value more than 1.158 - overprotection kick voltage to 1.1V in monitoring :(
3. fix a bios checksum. original bios
get it here or here
My bios work great with Catalist 8.7 in Windows XP and Vista x64, and don't work with catalist 8.8beta
Enjoy

This works GREAT for my gigabyte 4850! I could only get 750mhz ATiTool stable /w Accelero S1 though :(

Is that normal for this voltage and high end air? It full loads at only 46C.
08-09-2008, 10:21 AM
Factotum

Quote:

Originally Posted by HKPolice

stable /w Accelero
Is that normal for this voltage and high end air? It full loads at only 46C

Yes. I have S1+Noctua P12-1300 with voltmod 1.33V and 825MHz for GPU - full stable, max 60C
08-09-2008, 11:58 AM
stingush

Quote:

Originally Posted by HKPolice

This works GREAT for my gigabyte 4850! I could only get 750mhz ATiTool stable /w Accelero S1 though :(

Is that normal for this voltage and high end air? It full loads at only 46C.

i'm also working with this bios and it works great but i get only idle 1.05V and 1.16V at load...
is there any soft-modded way to get more than that on the VGPU?
08-09-2008, 12:35 PM
HKPolice

Actually after more usage, it's no longer idling at 160Mhz 2D mode, it's back to 500Mhz for some reason even when I'm not doing UVD decoding. Any idea? Driver bug or what? I'm using the newest 8.7 Cats.
08-09-2008, 12:44 PM
Factotum

Quote:

Originally Posted by stingush

i'm also working with this bios and it works great but i get only idle 1.05V and 1.16V at load...
is there any soft-modded way to get more than that on the VGPU?

kick ccc.exe in Task Manager and DElit all profiles: c:\Documents and Settings\<USER>\Local Settings\Application Data\ATI\
or push "Defaults" in ATI Overdrive
08-09-2008, 12:50 PM
Factotum

Quote:

Originally Posted by HKPolice

Actually after more usage, it's no longer idling at 160Mhz 2D mode, it's back to 500Mhz for some reason even when I'm not doing UVD decoding. Any idea? Driver bug or what? I'm using the newest 8.7 Cats.

see up, i have 160MHz in 2D
08-09-2008, 01:23 PM
HKPolice

Quote:

Originally Posted by Factotum

see up, i have 160MHz in 2D

Yes, I see 160Mhz after my first reboot of freshly installed drivers. But if I reboot again, it goes back to 500Mhz!!
08-09-2008, 01:51 PM
HKPolice

Ok I've figured it out. If you overclock too much and VPU recovery kicks in, it changes your CCC profile so that 2D clock gets switched to the 'medium' 500Mhz setting and your 3D voltage is also LOWERED by about 0.02v.

I was at around 1.17v with this bios in 3D before, after VPU recover + 500Mhz 2D switch, it dropped down to 1.15v.

Always delete the CCC profile files after a VPU recovery!!!

Stupid ATi drivers :down:
08-09-2008, 02:01 PM
drizzt5

I'm so happy it worked
http://img.photobucket.com/albums/v5.../BIOSFLASH.jpg
ty :P
08-10-2008, 03:32 AM
BAGZZlash

RBE v1.13 is out now!

It has not many, but powerful new features.
From the changelog:

v1.13
- Added the checksum calculation method WinFlash uses because for some files, the checksums differ. See built-in-FAQ for more on this.
- Improved checksum balancing algorithm to capture this. This is a completely new method, so there might be some minor bugs, but it is guaranteed to not corrupt any file. Notify me on any strange behaviour.
- Added one-click update functionality for some 48x0 cards which corrects a well known "spin-up bug" and improves powerplay (power saving functionality).
- Added method for overdrive limit increasing. Still experimental, read built-in help text before using this. Power users only!
- Fixed bug with not properly displayed overdrive limits.

Have fun and please give me some feedback! :)
08-10-2008, 05:56 AM
Factotum

update my bios pls
fix powerplay (THX for RBE1.13, but For all Fix use HEX by me)
08-10-2008, 07:13 AM
HousERaT

Quote:

Originally Posted by Factotum

I moded Sapphire HD4850 bios:
1. Upper limit GPU set to 950MHz
2. moded powerplay: in 3D set 1.158=1.21V (monitoring) - it's max value for Vgpu in bios. If value more than 1.158 - overprotection kick voltage to 1.1V in monitoring :(

Enjoy

Bios tested & works great, I flashed it with atiflash in windows. Now all I need is a Overdrive limit 1200/1400 version modded just like your first one. :D
08-10-2008, 10:25 AM
Mysterfix

Quote:

Originally Posted by Factotum

update my bios pls
fix powerplay (THX for RBE1.13, but For all Fix use HEX by me)

Link doesn't work. :down:
08-10-2008, 10:36 AM
HousERaT

Quote:

Originally Posted by Mysterfix

Link doesn't work. :down:

it just goes to the earlier post in this thread.

http://www.xtremesystems.org/forums/...6&postcount=81

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