ATI 4850/4870 voltmod thread

NBF, I talked with my friend Jaan (some of here might know him for his exteme Vmoding skills) atm. He gave some hints how to look right place. I'll do some measurements and report back. And it can be the BD-AF IC ;)

EDIT: I tried to figure something and here are my thoughts:
http://ceemic.pri.ee/hardware/hd4850_2/hd4850_02g.JPG
First bet would be "14" marked on my pic. Resistance to GND is ~1002 ohm (~1,0k ohm). If You have time maybe You can confirm it? 20k VR should be safe. There are many good soldering points. Sadly, I don't have time to try it next 2 days...

IT WORKS :D :cool:
http://ceemic.pri.ee/hardware/hd4850_2/hd4850_mod.JPG

So I used 20k VR and Vgpu rised pretty lot (I used ATi Tray Tools to adjust Vgpu and render 3D):

Before Vmod:
1,044@ATT -> 1,209V/1,322V (2D/3D)
1,158@ATT -> 1,339V/1,328V

After Vmod:
1,044@ATT -> 1,268V/1,386V
1,158@ATT -> 1,405V/1,392V


http://ceemic.pri.ee/hardware/hd4850...850_mod01v.jpg http://ceemic.pri.ee/hardware/hd4850...850_mod03v.jpg
http://ceemic.pri.ee/hardware/hd4850...850_mod04v.jpg http://ceemic.pri.ee/hardware/hd4850...850_mod05v.jpg
:cool:

EDIT: I recommend a switch for 24/7 use, because 20k VR rised Vgpu a little bit too much and it boosts GPU temp! PWM and PCB temp even more!

Quote:

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Originally Posted by ceemic

IT WORKS :D :cool:
http://ceemic.pri.ee/hardware/hd4850_2/hd4850_mod.JPG

So I used 20k VR and Vgpu rised pretty lot (I used ATi Tray Tools to adjust Vgpu and render 3D):

Before Vmod:
1,044@ATT -> 1,209V/1,322V (2D/3D)
1,158@ATT -> 1,339V/1,328V

After Vmod:
1,044@ATT -> 1,268V/1,386V
1,158@ATT -> 1,405V/1,392V

---

Awesome ceemic!!! Will try it tomorrow!

Do you have the 20kOhm VR set to max resistance in your test?

Quote:

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Originally Posted by NBF

Do you have the 20kOhm VR set to max resistance in your test?

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Max res ofcourse. I'm even thinking changing the 20k VR to 50k VR...

Btw, please measure the FB -> GND resistance and report back Your result.

Quote:

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Originally Posted by ceemic

Max res ofcourse. I'm even thinking changing the 20k VR to 50k VR...

Btw, please measure the FB -> GND resistance and report back Your result.

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I'll measure it and report back ;)

I think 50k VR will give better control. I dont have it at home so maybe I'll add a fixed 10k to a 20kVR to give some offset. :up:

20k has better (smoother) controll, but the first default jump is too big.

Quote:

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Originally Posted by ceemic

Max res ofcourse. I'm even thinking changing the 20k VR to 50k VR...

Btw, please measure the FB -> GND resistance and report back Your result.

---

FB -> GND resistance @ stock card is 1004 Ohm

Mod is working good!!! :up:

Thanks ceemic :clap:

NBF, nice to know :)
I had 1002ohm FB->GND. What VR You used and how much Vgpu changed?

Quote:

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Originally Posted by ceemic

NBF, nice to know :)
I had 1002ohm FB->GND. What VR You used and how much Vgpu changed?

---

Used same spot you did for soldering, ended up using 10k fixed + 10K VR, that is what I had in hand. It raised Voltages quite a bit, Reads 1.320V@idle and 1.398V@load with VR to max :rofl:

But I'm not happy with clock achieved yet, almost 1.4V and card is benchable only at 760.

I'll work on the cooling and then aim higher clocks.

NBF, my card isn't a good clocker also, ~1,55V@+10C ambient and hard to pass 900MHz :(

lol are you kidding me ? my 4850 needs 1.8V for 970Mhz lol

Quote:

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Originally Posted by Vatos_locos

lol are you kidding me ? my 4850 needs 1.8V for 970Mhz lol

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:eek: Isn't OVP somewhere@~1,6xV? :confused:
I had my friend's Sapphire reference PCB (2-phase PWM) HD4850 and it did 960+@1,57V :rolleyes:

nope no ovp for me :p: sapphire 4850 1Gb
the previous card clocked much better 1.4V for 870 but she died @ 1.5 :(

This week I'll try, what my card can do under LN2 :D

hello huys, could you be so kind and show me vmod for palit sonic 4850?)

and btw, all 1gb 4870 cards have hynix not qimonda?

Quote:

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Originally Posted by -DC-

hello huys, could you be so kind and show me vmod for palit sonic 4850?)

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Do a pic from Your card and tell what controller there is;)

Quote:

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Originally Posted by ceemic

Yes, You can use all these points:
http://ceemic.pri.ee/hardware/hd4850gs/hd4850gs_04m.jpg
I soldered over the two point marked with blue lines :)

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could you please describe what you did exactly? you´ve soldered one wire to to point above 1 of C11 and R from R34, that wire goes to one side of the 100k VR (base contact?) and the other side goes to that big joint on the other side of pcb... but what is that third wire (yellow) for coming from the VR? or is it just the insulation for the red wire?

kind regards

Quote:

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Originally Posted by ceemic

Do a pic from Your card and tell what controller there is;)

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i don't have it atm) my friend asked to help him) ok, i'll ask to make some pics

leinad78, You mean this: http://ceemic.pri.ee/hardware/hd4850gs/hd4850gs_09.jpg ? It's just insulation (thermoshrinkable cover).

thanks, i will try that at the weekend :up:

whats that brown single connector for?

leinad78, Vgpu monitoring for DMM. http://ceemic.pri.ee/hardware/hd4850gs/hd4850gs_16.jpg

so i could use that connection at the resistor to measure Vgpu against 0v?

so, done Vmod to my reference Powercolor 4850 two days ago. Runs with new bios @ 1,37V load with 825mhz 30 minutes renamed Furmark stable. Mem does 1120 Mhz without VMod yet.
May i try 1,4V to push the card to 850+? I tryed 1,41 V but the red led followed a black screen ;) - is there a volt limit on 4850? Or are the phases getting to hot? The cooler on the phases has around 40°C after 30 minutes furmark. GPU temperature shown in Furmark is 40°C / 100°F load.

I messaured 1,37 V @ 850 Mhz, Furmark load, then the driver restarted after Furmark error, system keept running. But when i messaured load again, voltage dropped about 0,03V - and with the second error in furmark, the voltage dropped 0,03 V again! This is serious. Someboy may be able to explain this "feature"...
After reboot, voltages were @ 1,37V again. So i have to reboot after every furmark error.

Thanks for help.

I think I got the worst mem clocking 4850 ever...

A Powercolor that comes with 650/950 stock clocks, card can't even do the regular 1000 on memory without artifacts. :rofl:

If you see something that looks like that.... just run as fast as you can :ROTF:
http://img511.imageshack.us/img511/4881/imagemxq5.jpg


Oh well, Ill try modding Vmem to see if gets any better.

try an other Bios ;)

Quote:

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Originally Posted by Vatos_locos

try an other Bios ;)

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Will try, thx for the tip ;)

does anybody have the problem that 3 to 5 trys are needed to boot a system with an OC HD4850?

When my sytem was off for a few hours, i can turn it on but screen stays black. Can do this several times. Sometimes i need to disconnect PSU and connect it again. Board is an P5K-E with 480 FSB. PSU has 1200 W Silverstone, 28A on 12V per rail.
Tried some newer P5K-E bios versions, nothing helped. Any ideas?

So I have a couple quick questions before attempting this mod after reading virtually the whole thread. I just want to be clear on what I need to do:

This will be for a Visiontek 4850 under water cooling. Current temps are 32c idle and 37c load with ambient of 25-27c.

1 - Theta stated earlier that if you want a specific voltage you could use a fixed resistor:

10 ohm fixed ~ 1.566v
15 ohm fixed ~ 1.465v
22 ohm fixed ~ 1.400v
27 ohm fixed ~ 1.375v
33 ohm fixed ~ 1.355v

Does this still hold true?

2 - Where do you measure the voltage to see if it worked or not? On the card while it is turned on? In windows? Can you just connect a 12v PSU to it and power it on to see the voltage without having it installed on a MB?

3- Where am I measuring resistance at, between the two solder points?

4 - I grabbed this pic from earlier in the thread showing where to solder for both GPU and Mem voltages. Is it correct?

http://img205.imageshack.us/img205/4303/picxz4.jpg
By utnorris at 2008-11-08

Voltmod http://www.powercolor.com/Global/pro...ProductID=2355 confirmed working. 10 Ohm fixed and a 50 Ohm in series.

This card is benchable around 880 gpu w/o mod. Expect at least 950 after mod. Testing about to commence :)

I have an Asus EAH 4870 512mb non-reference card.

http://www.techpowerup.com/img/08-09-02/51b.jpg

My thoughts about it can be read in this post. The card does really weak on the core overclocking. Perhaps i might do a mod and see if that helps. Unfortunately i don't seem to find any info on voltmodding this card. Any help would be appreciated.

Thanks!

Quote:

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Originally Posted by roger_h99.nor

Voltmod http://www.powercolor.com/Global/pro...ProductID=2355 confirmed working. 10 Ohm fixed and a 50 Ohm in series.

This card is benchable around 880 gpu w/o mod. Expect at least 950 after mod. Testing about to commence :)

---

nice..

can you confirm the 3x 47uf poscap on your 4870

http://www.edc.sanyo.com/english/pdf/poscap/E42.pdf

thanks

trez0r some hight res. pic's of the card would be helpful :)

Quote:

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Originally Posted by NapalmV5

nice..

can you confirm the 3x 47uf poscap on your 4870

http://www.edc.sanyo.com/english/pdf/poscap/E42.pdf

thanks

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Hi, can not recall to have seen caps similar to those in the pdf, but if you could suggest where to look for them, I'll sure have a closer peek.

Quote:

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Originally Posted by Vatos_locos

try an other Bios ;)

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Tried 5 different BIOSes, none worked :(

I guess ill need one from a Powercolor/Club3D 4850 with DVI-HDMI-DisplayPort, which I couldnt find.

I would be tankfull if somebody that have one of this cards could upload a copy.

Hi friends. I received my 4870 sapphire from rma.... but... this 4870 have blue pcb and i would like to do a vmod. Someone know if the vmod is the same , like 4870 with red pcb?

kur¡, is the layout same? Same IC?

Quote:

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Originally Posted by ceemic

NBF, I talked with my friend Jaan (some of here might know him for his exteme Vmoding skills) atm. He gave some hints how to look right place. I'll do some measurements and report back. And it can be the BD-AF IC ;)

EDIT: I tried to figure something and here are my thoughts:
http://ceemic.pri.ee/hardware/hd4850_2/hd4850_02g.JPG
First bet would be "14" marked on my pic. Resistance to GND is ~1002 ohm (~1,0k ohm). If You have time maybe You can confirm it? 20k VR should be safe. There are many good soldering points. Sadly, I don't have time to try it next 2 days...

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my friend has the same card as you

How can he make pencil-mod for vcore ??
thanks in advance

Duniek, I'm not that confident on pencil moding. I don't like pencil mods, because they are not that reliable and it's bigger possibility to kill the card. I don't see there any SMD resistor that could be pencil-moded. The only point where GND is other spot:
http://ceemic.pri.ee/hardware/hd4850...50_mod_pen.JPG

Quote:

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Originally Posted by ceemic

Duniek, I'm not that confident on pencil moding. I don't like pencil mods, because they are not that reliable and it's bigger possibility to kill the card. I don't see there any SMD resistor that could be pencil-moded. The only point where GND is other spot:
http://ceemic.pri.ee/hardware/hd4850...50_mod_pen.JPG

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I have done on that exact spot, I did it for a friend that didn't want soldering on the card.

It works fine, just have to be very carefull with the pencil.

Lowering #14 -> gnd resistance to ~950ohm give around 1.4V on the GPU.

NBF, tnx! Yep, it should work. It's vital to measure resistance drop after every pencil stripe...

Quote:

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Originally Posted by ceemic

Duniek, I'm not that confident on pencil moding. I don't like pencil mods, because they are not that reliable and it's bigger possibility to kill the card. I don't see there any SMD resistor that could be pencil-moded. The only point where GND is other spot:
http://ceemic.pri.ee/hardware/hd4850...50_mod_pen.JPG

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thank you:up:
it works, but one more question I hope last
where he can measure vcore on gpu, I mean which point or points I should check?

Duniek, http://ceemic.pri.ee/hardware/hd4850..._mod01_mon.jpg ;)

Will the 4830 mod in the same way as the 4850 do you think?

I'm thinking of saving a few £££ and going for a 4830 and using good old modding and overclocking to get more bang out of it.

Hopefully not the bad, electrical, flashy kind of bang though :rolleyes:

Jimbo Mahoney, You have to know what PWM controller there is. Do some macro close-up's from IC and PWM.

Quote:

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Originally Posted by largon

Asus EAH4850/HTDI/512M has 3 phases.
Both EAH4850/TOP/HTDI/512M and EAH4850/HTDI/1G have just 2 phases, not 4 (inductors ≠ phases).

What did you ask from Diamond? To help with a vmod?
:clap:

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But u told that 4850Ics can handle only up to 2 phases? What about Gigabyte Blue UD and Gainward GS 4850? Both looks like an 4+1 design...

Barr3l Rid3r,they have other ICs which can operate with more phases? :rolleyes:

How do I explain why I get black screen with the Core over 835MHz?

locked bios maybe ? try one from the Internet

8800's@over, save the BIOS with GPU-Z and then open it with newer RBE. So You'll see the max limit and can edit it too...

anyone with oc'ed 4850 800+mhz core 1150+mhz mems that works on newer catalyst driver?

i can't get my 4850 870/1200 to work on newer catalyst. it only works with catalyst 8.7 :(
any tips to make it work on a newer driver?

thanks in advance ;)

DJSUB, same problem here with 4850 and 4870. The problem occurs when I change max clock limits with RBE...

same things happens to me even without changing the max clock slider in RBE.

recently i tried changing the max clock slider to 950/1350 without hash. i could boot to windows but it didnt install the driver correctly.

last month i tried flashing the original bios (stock core & mems speed) of my gecube then install the newer driver.
then i tried ocing the card to 725/1000+mhz mem clock using CCC. it work flawlessly in that speed.
from what i saw, you can oc'ed your vc to ccc's limit. you can also set that max clock in RBE without problem.
i only use stock fan that time. i will try to do that again but this time i will try higher coreclock in ccc :)

I also have the Asus 4850 custom pcb.
Because i didn't understant where i have to do the pencil mod, can i have some confirmation?
I measured the resistance and is indeed 1kΩ.
http://e.imagehost.org/t/0773/pencilmod.jpg
Where i have brown colour, i need to shade with the pencil? in between ?

leoy, yes, You are right ;)

Quote:

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Originally Posted by ceemic

leoy, yes, You are right ;)

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Did it and it works nicely...
Took the resistance down to .96 and now i am 1.38 by ddm full load at furmark(almost 60 degrres temp)... Seems stable at 750..:D
I have a scythe musashi cooler...
Should i go for more?? Or it would be a bad move?

For 24/7 I wouldn't recommend...

I just tested 1.42 load( took the resistance down to .925) .
Stable 800(too bad ccc stops there :( )
Temps max at 60's....
Something that worries me is that deafult i was reading 1.31 with the dmm at load.1.26 idle. Is it because it is asus custom?

And i took it down to 1.39v is this safe with temps under 60?

my 4850 read 1.18v at load at defaulr resistance of 1.85kohm ,reduced it to 1.22 vcore went up to 1.30-1.31max with clock speed max
stable at around 765mhz .anything above that causes catalyst 8.11 to crash or game crash. overdrive takes it ip to 790mhz stable.well i am not able to increase voltage in bios above 1.158(max in RBE) as it causes windows to not able to boot upto desktop screen.Anything for that and how much is safe resistance (and voltage)that can be dropped upto for safe use.

Quote:

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Originally Posted by rahul5

my 4850 read 1.18v at load at defaulr resistance of 1.85kohm ,reduced it to 1.22 vcore went up to 1.30-1.31max with clock speed max
stable at around 765mhz .anything above that causes catalyst 8.11 to crash or game crash. overdrive takes it ip to 790mhz stable.well i am not able to increase voltage in bios above 1.158(max in RBE) as it causes windows to not able to boot upto desktop screen.Anything for that and how much is safe resistance (and voltage)that can be dropped upto for safe use.

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supports 3dMark 2006???

Regards

very much

Not game stable at all, off course. Can play Warhead at 950 though.
Memory freaks out before 1 Ghz.
VGPU at 'only' 1.35. Will try to push it to 1.40.
I'm not particulary skilled at OC, so this card must be awsome :D

any pics on modding gainward HD4870 GS 1024mb (with 2x2phase design) ?

help appreciated...

Quote:

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Originally Posted by ceemic

I haven't got time to mod my Asus, but friend of mine gave me his two Gainward HD4850 512MB Golden Sample :p:
http://ceemic.pri.ee/hardware/hd4850...4850gs_05v.jpg http://ceemic.pri.ee/hardware/hd4850...4850gs_07v.jpg
http://ceemic.pri.ee/hardware/hd4850...4850gs_09v.jpg http://ceemic.pri.ee/hardware/hd4850...4850gs_10v.jpg
http://ceemic.pri.ee/hardware/hd4850...4850gs_13v.jpg http://ceemic.pri.ee/hardware/hd4850...4850gs_14v.jpg
http://ceemic.pri.ee/hardware/hd4850...4850gs_15v.jpg http://ceemic.pri.ee/hardware/hd4850...4850gs_17v.jpg
Other pics: http://ceemic.pri.ee/hardware/hd4850gs/

Def Vgpu changed (idle/load) 1,194V/1,214V -> 1,207V/1,221V
:)

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Greetings. I have Palit 4850 sonic. The PCB looks identical to this gainward card. I need help to do a pencil mod on it. Is this possible at all? Thanks.

JimmyH, not sure. Try to search GND points other side resistors marked with green: http://ceemic.pri.ee/hardware/hd4850gs/hd4850gs_04m.jpg

is there a 4850 bios compatible with newer drivers that has >800Mhz overdrive limits? currently overclocking with ati tray tools and the gains from oc aren't much better than with CCC and lower clocks. :(

Hi,
Ok thanks. How do i comfirm a point is ground? check resistance to the 8pin connector ground on the other side???

JimmyH, Yes.

What are the current clock limits of the Cat8.11 with 4850?

Quote:

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Originally Posted by raibemunn

What are the current clock limits of the Cat8.11 with 4850?

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well persomally i cant even overclock my 4850 with the newer catalyst drivers :(:( i've tryed every ocing software that i know still no go.. swiched back to the 8.10 and im able overclock it normally..weird thing :shakes:

Quote:

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Originally Posted by Solarfall

well persomally i cant even overclock my 4850 with the newer catalyst drivers :(:( i've tryed every ocing software that i know still no go.. swiched back to the 8.10 and im able overclock it normally..weird thing :shakes:

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what's your highest overclock in catalyst 8.10?

thanks! :)

Quote:

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Originally Posted by DJSUB

what's your highest overclock in catalyst 8.10?

thanks! :)

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im still testing the highest possible clocks :D but so far with 1.5v i've able to get the gpu to 940mhz (3d stable) :yepp:

lol, well, thats way above what im trying to achieve.
can i start with 100k vr with gigabyte 4850?:)

Quote:

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Originally Posted by Solarfall

im still testing the highest possible clocks :D but so far with 1.5v i've able to get the gpu to 940mhz (3d stable) :yepp:

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is it hardmodded? what cooling do you use?

thanks! :)

Quote:

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Originally Posted by DJSUB

is it hardmodded? what cooling do you use?

thanks! :)

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yep its hard modded i used just a simple watercooling rig.. my temps stay around 35c under load

Quote:

---

Originally Posted by raibemunn

lol, well, thats way above what im trying to achieve.
can i start with 100k vr with gigabyte 4850?:)

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yes i also have gigabyte card that i volt modded :D and i also used 100vr like the many guides suggest :up:

Quote:

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Originally Posted by Solarfall

yep its hard modded i used just a simple watercooling rig.. my temps stay around 35c under load




yes i also have gigabyte card that i volt modded :D and i also used 100vr like the many guides suggest :up:

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wow thats great! :)
what are the things i need for watercooling the vc?
i'm sorry very noob about that :D

thanks

Quote:

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Originally Posted by DJSUB

wow thats great! :)
what are the things i need for watercooling the vc?
i'm sorry very noob about that :D

thanks

---

well i personally have a eheim 1250 pump.. tube like reservoir ( cant remember whos the manufacturer is ) D-tek fusion gpu block, and 240mm rad+ i use 12mm tubing

thanks brotha! i will write it down to my slambook :rofl:

First off, thanks in advance for any/all help I am about to receive....

I bought the ASUS TOP 512 4850 from NE. It came in a TOP box, and has TOP factory clocks (680/1050). However, the design of my PCG is the 3 phase design of the non-TOP, as opposed to the 2 phase design of the TOP. I have an Accelero S1 on it, with copper sinks on all the RAM, all 3 chokes (the gray ones), and all 9 vregs (the little black ones). I also have a Yate Loon SL 120mm strapped to the Accelero, and PLENTY of case cooling and airflow. Now, here are my issues:

1) Temps

According to GPU-Z, even at stock clocks (680/1050), when stressing my GPU for a bit and the temps level out, they are:
GPU: 48C
RAM: 98C
SHAD: 74C

My RAM and SHADER temps seem WAAAYYYYY high (98C = ~204F). I touched the sinks on the RAM, choke and vreg and they're all warm, but not overly hot (certainly not hot enough to indicate 98C). To me, this means that there is somethign seriosuly wrong with the transfer of heat from the chips to the sinks, or GPU-Z is not reading these temps right. I'm also able to OC this card to 760/1175 stable in games on stock volts. It seems to me that its highly unlikely that my card would be able to OC that far AND be stable if the temps were that high. (a) So, does anyone know if there is some sort of issue with GPU-Z reading temps on the 3-phase card? (b) If so Is there a way around it? (c) Is there another program that can give me more accurate readings, or should I just not worry about it?


2) Volt modding this PCB

I read a bit back on pages 43-45 (i think) about NBF and Cermic talking abotu volt modding thsi PCG, but they were doing the hard mod. (d) Does anyone know if this can be pencil modded, and if so how? (e) Can I follow the guide on TechPowerUP? (f) Should I consider trying to return this card due to the 3 phase setup, even though it seems to be a good OCer on stock volts? (g) What is the difference and potential pros/cons between the 2 phase and 3 phase setups?


Here are pictures of what I'm talking about:

This is what my card should look like, the standard 2 phase setup:

http://img363.imageshack.us/img363/6...tdi512mwc0.jpg


And here is what my card actually looks like. It came in a TOP box and has TOP factory clocks (680/1050).
Problem is, its a different PCB and may not be able to be pencil modded :bang head:
As you can see, there are three chokes with 3 vregs behind each. I have a sink on each choke and each set of vregs.
http://img380.imageshack.us/img380/8...tdi512mla7.jpg


I know I'm asking a lot of questions here; this is the culmination of several threads over at OC Forums. Thanks again for all your help!!!

PS - Idk if posting links to other threads is allowed here, but if anyone is curious about reading a little more about this (and i know you probably don't; this is practically a novel already) PM me and I'll provide links.

If u have the above in the picture, which i also have,
Then
http://e.imagehost.org/view/0773/pencilmod.jpg

Just shade it!
I took it to 1.4v...
Default was 1.31 load.

Quote:

---

Originally Posted by leoy

If u have the above in the picture, which i also have,
Then
http://e.imagehost.org/view/0773/pencilmod.jpg

Just shade it!
I took it to 1.4v...
Default was 1.31 load.

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EDIT: I had posted a question about your picture, but then I read back a couple pages and found the answers... thanks!

Is anyone out there with the 3-phase PCB getting the same strange temp readings in GPU-Z as me (questions (a) (b) (c) )?

How about you Leoy, how are your MEMIO readings in GPU-Z under load?

Quote:

---

Originally Posted by sirrealist

EDIT: I had posted a question about your picture, but then I read back a couple pages and found the answers... thanks!

Is anyone out there with the 3-phase PCB getting the same strange temp readings in GPU-Z as me (questions (a) (b) (c) )?

How about you Leoy, how are your MEMIO readings in GPU-Z under load?

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No they are fine... 65 under load

Quote:

---

Originally Posted by trez0r

I have an Asus EAH 4870 512mb non-reference card.

http://www.techpowerup.com/img/08-09-02/51b.jpg

My thoughts about it can be read in this post. The card does really weak on the core overclocking. Perhaps i might do a mod and see if that helps. Unfortunately i don't seem to find any info on voltmodding this card. Any help would be appreciated.

Thanks!

---

Did this yesterday:

Default-vGPU: ~ 1,250 V (Idle)

@20 kOhm: ~ 1,300 V (Idle)

Pics:

http://www.awardfabrik.de/images/sto...70-vGPUMod.jpg

http://www.awardfabrik.de/images/sto...GPUmeasure.jpg

Maybe someone has a better measure point...

Was able to get 40 MHz ~ 50 MHz more GPU-clocks with 1,3 V under air...

Danke for the info stummerwinter! Will give it a try probably. Btw how far can you push your card now (atitool artifact free) and what did it do on stock?

They do very poor (I have two)...

With 1,3 V ~ 850 AM3 and 840 3D01...

Didn't test ATITOOL...

das nennst du geringe taktraten? meine macht gradma 775/1175 im artefact scan, DAS nenn ich wenig :p:

maybe you should try atitraytool and do a artefact scan, i´m definately interested in the difference between those :)

tested last night some 3d stability with the volt mod i made 930 seems to be the sweet spot for all 3marks (in xp).. i tried upping the voltage to 1.6v but adding more voltage didnt help so desided not to burn my card and just stick with these clocks, not bad for 1.5v imo :D aquamark was stable at 960mhz i forgot to snap a pic of that :p:

here is the evidence of those quick 3d runs

http://i163.photobucket.com/albums/t...s/01931mhz.jpg

http://i163.photobucket.com/albums/t...s/03931mhz.jpg

http://i163.photobucket.com/albums/t...s/05931mhz.jpg

http://i163.photobucket.com/albums/t...s/06928mhz.jpg

http://i163.photobucket.com/albums/t...pcmark9559.jpg

http://i163.photobucket.com/albums/t...s/DSCN1408.jpg

Woot..that's some crazy clock on the Core :)

hey guys, i know this might have been cover but i did look thru a fair few pages and didnt find an answer, i have 4870 in CF im using the asus top bios and can run 3dmark06 840/1100 no probs, tonight i voltmodded my cards and anything over 840 3dmark06 locksup the pc? any thoughts?
Regards Andrew

Anyone have any ideas regarding my abnormally high (and seemingly incorrect) RAM temp readings (please see post #1179)?

Quote:

---

Originally Posted by terroristone

hey guys, i know this might have been cover but i did look thru a fair few pages and didnt find an answer, i have 4870 in CF im using the asus top bios and can run 3dmark06 840/1100 no probs, tonight i voltmodded my cards and anything over 840 3dmark06 locksup the pc? any thoughts?
Regards Andrew

---

these cards are very very finiky with temps.... what voltage are you trying to run?

Quote:

---

Originally Posted by JamesBong420

these cards are very very finiky with temps.... what voltage are you trying to run?

---

I'm still running stock volts.

As i posted above, I've got an Accelero S1 w/ 120mm Fan blowing right on it, with Thermalright copper sinks on all the RAM, choke and vreg chips. None of them are overly hot to the touch @ load.

Load temps are (according to GPU-Z):
GPU: 48C
RAM: 98C
SHAD: 74C

The card OCs to 760/1175 stable (again, this is stock volts).

It seems to me that either:

1) There is something SERIOUSLY wrong with the heat transfer from the chips to the sinks, since if the transfer was as one would expect (and assuming the temp reads are correct), the copper should be SCORCHING hot and/or the thermal adhesive would probably be bubbling and such (98C ~= 208F). Would the card be stable at such a high OC on stock volts if the RAM and SHADER temps were really that high?

2) OR, the seemingly simpler is that the temp reads are just wrong. Any idea why that would be (i seem to be the only one with this problem; people with my exact card have "expected" RAM temp reads). Is there any other program or way to get some temp reads from RAM? Should I just forget about it and just start volt modding?

:shrug:

when you guys change voltages, do you shut down the pc or do it on the fly in windows?


anyways, with Barr3l Rid3r's bios default clocks (400/750, 680/990), my voltages are like this: 2D 1.023V; 3D 1.300V
Thats weird because Barr3l Rid3r had his 2D clock running at the same voltage, but 3D was a whole .03 higher (1.33V) than mine.
huge pics

Quote:

---

Originally Posted by raibemunn

when you guys change voltages, do you shut down the pc or do it on the fly in windows?


anyways, with Barr3l Rid3r's bios default clocks (400/750, 680/990), my voltages are like this: 2D 1.023V; 3D 1.300V
Thats weird because Barr3l Rid3r had his 2D clock running at the same voltage, but 3D was a whole .03 higher (1.33V) than mine.
huge pics

---

Sweet, what about OC, does it gets any better using that bios I`ve maded?

well i just played crysis wars for half n hour with 750/993 artifact free. atitool looked artifact free too - though 760+ had yellow spots.
core temp had maximum value of 37*C degrees while playing , but shader and memIO hit almost 70*C (why's the difference so big, they are all under the same chip, right).
anyway no worries yet then :P

but idk if it got any better, i havent oc-d before with this card. first thing was applying the mod and then flashing the card with your bios.

edit.
k i think ill leave it at 1.066V/1.354. I wereng going extreme on this anyway. Since i got only 20MHz increase with extra 0.054V and shader/memIO are went to 90*C with fur, i think ill leave this for 24/7 use.


btw, is it safe for me to modify your bios 2D/3D clocks with RBE (again?) ?

Quote:

---

Originally Posted by JamesBong420

these cards are very very finiky with temps.... what voltage are you trying to run?

---

i have mcw60's on them so temps are low, im trying to run 1.4volts, im starting to think maybe i should start at a lower voltage, say 1.32?
Regards Andrew
i just tried @ 1.36 volts and 880 core still the same, also tried renaming 3dmark06.exe. im using the waterblocks with the stock heatsink for the rest of the card and the fan speed on 60...do you guys think that maybe the rest of the card is getting too hot?

Now I've found what I needed, fan mod that is CrossFire compatible, shifted from 70mm slim for 80mm slim fans (15mm tall)


@840Mhz/2000Mhz for Daily use @ 1.33v vgpu / 2.04v vmem

http://img512.imageshack.us/img512/1909/vga1rr1.jpg




http://i35.tinypic.com/35cn4td.jpg



http://i38.tinypic.com/2q2pbva.jpg




After Pencil Vmem (2150Mhz) 2.04V -> 2.12V (2400Mhz) nice gain!

http://i38.tinypic.com/or55ko.jpg



http://service.futuremark.com/compare?3dm06=9008177


@ 900Mhz (1.47v)/ 2400Mhz (2.12V)

Quote:

---

Originally Posted by terroristone

i have mcw60's on them so temps are low, im trying to run 1.4volts, im starting to think maybe i should start at a lower voltage, say 1.32?
Regards Andrew
i just tried @ 1.36 volts and 880 core still the same, also tried renaming 3dmark06.exe. im using the waterblocks with the stock heatsink for the rest of the card and the fan speed on 60...do you guys think that maybe the rest of the card is getting too hot?

---

both of my 4870s will not bench with 1.4v(load) at 900 mhz... but they will with 1.36v.. one is stock cooling the other an s1 with 2x120mm(130cfm each)..

also on a side note.. ZoLkoRn had stock volts and put some ln2 on the card and he went to 990mhz. i have found them to be finicky cards.. and i am wanting to tear them apart with more mods..
ZoLKoRns Thread

Hello there,

have a big Problem with my Powercolor HD4850. I edited my Bios with the newest ATI Bios Editor. First i changed clocks, flashed the new bios, no problems at 825/1120 with hardmod. Worked fine and is Furmark stable up to 850.

Yesterday i connected my LCD TV to my card. I use a DVI-HDMI, but a HDMI cable with the adapter makes no difference. First i saw a cloned view, but after a few seconds, screens turned green, Vista 64 PC reboots.
Reboot with connected cable causes bluescreen again...

I resetup Vista, intalled CCC 8.11, same problem. Reflashed the orginal bios, working fine with my TV. Problem must be in bios. Loaded the orginal bios, changed nothing, and flashed it.
TV makes problems again.

Can anyone test it? Does anybody have a HD 4850 and a LCD TV? Don't know where the problem is, but i hope this will be fixed with the next Version of RBE.

Thanks for help and sorry for bad english!

BTW - i flashed modded bios with winflash, the orginal with atiflash. But my P5K will notboot up from USB and I don't want to burn a msdos cd again and again...

Yeah I had the same issue with flashing my 4870 1gb. The RBE must not be reading writing somthing right with these BIOS or, just some of them for some reason. I ended up flahing to a PowerColor BIOS to get higher stock settings and higher CCC limit.