How to Modify Your HD2900 BIOS Clock Frequencies by Hex File

[MGreg]

Hey, I've been using the QuantumForce2900BiosEditor
and have adjusted my speeds to 850/900 for my cards in crossfire.
1.15V 3d

I was wondering if anyone can help me figure out how to change 2d voltage and possibly even lower then 1.15V 3d voltage.
Also where the 2d/3d clocks are in the bios, I have been trying to figure out why I can't find the same numbers in the bios as in posts in this thread.
My attempts haven't worked. I have 2 512MB XT's. So far the HIS bios works well for me.

http://www.techpowerup.com/vgabios/

[mossad]

Found it.
The 256 bit did look a bit differnt from the 512bits bioses.
(no 'D9-00-04-01' section)

RED is Core clock
GREEN is Mem clock
Blue is Vcore.

hi there again, that tool is that i tried that quantum blahblah but it have all the boxes with VIDs and GPU MEM freq. grey and i am unable to fill it with something, also there r no walues readed from bios so i think it dont really work with 256bit ;] (like Rabit bios editor - read only card name, vendor id, but no freq, etc)
and next point in your video bios guide i dont understand, what is kind of 01 FF, cause in 2d i c there is 1000 which is 1.0V and that is correct, but FF01 is 65281 which is relatively close to FFFF which is maximal walue for 4 byte string in dec it gives 65535 , but no sense to me how to edit this kind of value of voltage ;] my tinny brain dont accept this
and editing 2d voltage will be good but no such as good as 3d voltage... if there will be no way i can hard mod it like some 2900gt voltmod if there is something of this way?
this or that way i appreciate your help Roger.

[roger_h99.nor]

QantumForce bioseditor seems not to recognize the 256 bit bios. (I tried)
Rabit does not support the 2900 bioses (as yet).

FF01 seems to be a 'proxy' - pointing somewhere els in the bios-file to the 3d voltage. FF01 is safe to overwrite with the HEX value corresponding to the desired voltage.
How to do this is described earlier in this thread. (remeber to invert the hex numbers!)

[mossad]

had i to do something with bios CRC on asus P965 board or its only problem of dfi and some other brand as i readed here?

[Circaflex]

Hey guys I have a HIS 2900XT all im looking to do is change the voltage a tad bit, i have a few bios's but im running an abit board. I saw there were extra steps to take, if anyone is willing to help me out, maybe even create the file for me could you pm or post in here?

[Guz]

Okay, I've something interesting to share and was wondering if others could help explain this to me.
All my previous clocking on this were done with the Quantum editor using my stock BIOS and I've had a heck of a time getting good results from my OCing. Well, yesterday I decided to modify my BIOS using a Hex editor and took steps to correct the checksum as well. Now everything works great and I am now stable in 3DMark05/06 firefly test (which use to lock up @ 850MHz) and I am also getting better results in CF using WiC benchmark.



My current clocks are 850/900/1.25V. I ran WiC @ 1920x1200 w/ everything on high and AA/AF disabled.

Avg: 46
Min: 22
Max: 140

Can anyone explain why I'm getting much better results? Could the invalid checksum have caused conflicts with CF and Catalyst drivers? I can't think of any other reason why I am problem free at these clocks. I am sooooo happy right now.

Final question. What are the upper limits in regards to core/VRM temps for the HD2900XT? Is there a white paper out there some where? Right now my temps are GPU1/2: 87/85 VRM: 80/77 while running 7 consecutive benchmarks in WiC.

Thanks guys......

I did not overclock and have an equal increase in fps in Wic. Probably due to new catalyst 7.12 drivers or new patches. Current Wic version update i think is 1.005.

[mossad]

FF01 seems to be a 'proxy' - pointing somewhere els in the bios-file to the 3d voltage. FF01 is safe to overwrite with the HEX value corresponding to the desired voltage.
How to do this is described earlier in this thread. (remeber to invert the hex numbers!)

i just tried to mod my 2d, so now i am on 399/405 instead of 507/513 but i tried to modify voltages too, so my lines now seem this: DC 9B 00 34 9E 00 84 03
399 / 405 / 900 (0.9V) but rivatuner is stil reading 1V, first i tried 0.95 then i thinked its too small to be seen but either 0.9v isnt working, so can be voltages regulated at other place ?
i just not tested 3d voltages yet...

edit: i unpluged 2 ground cables from 8pin so now its only 6pin conected, so there isnt active overdrive in CCC, so now 0.9V for 2d normally works which is good... so there had to be only 6pin in 8pin cause other hand it seems that if overdrive is active CCC is controling voltages and 3d speeds more than bios...

[ZeRo4u]

i just tried to mod my 2d, so now i am on 399/405 instead of 507/513 but i tried to modify voltages too, so my lines now seem this: DC 9B 00 34 9E 00 84 03
399 / 405 / 900 (0.9V) but rivatuner is stil reading 1V, first i tried 0.95 then i thinked its too small to be seen but either 0.9v isnt working, so can be voltages regulated at other place ?
i just not tested 3d voltages yet...

edit: i unpluged 2 ground cables from 8pin so now its only 6pin conected, so there isnt active overdrive in CCC, so now 0.9V for 2d normally works which is good... so there had to be only 6pin in 8pin cause other hand it seems that if overdrive is active CCC is controling voltages and 3d speeds more than bios...

What planet do you come from?

here some bios tools: http://www.tinyurl.com/37t2h3

[roger_h99.nor]

@ZeRo4u
If you had taken the time to actually read mossad's post you would have noticed that he owns a 2900GT.

[mossad]

actualy 2900 gt PCB with R600 320 stream core , which is super imba hybrid, now i can say, card has only 1 8pin, so there must be only 1 6pin conetor to have overdrive in CCC disabled, then all bios modifications are visible, if there is 8pin CCC overdrive bios settings... so roger, your table works great
now i am on 0.9V 2d 399/405 and 1.15V 3d 750/950 instead of 1V 506/513 2d and 1.08V 600/800 3d... 750/950 couse it was max stable with 1.08v, now i got tested that 800/1000 is stable, 830/1000 isnt, but now i got only stock cooler so there is not so many room to oc and i am happy with what i got ...

[ZenEffect]

anyone else having problems with catalyst 7.12 and modded bios in cf? i had to downgrade back to 7.11 because i get a black screen with the new drivers

[ZenEffect]

i see a bunch of 1.25 volt bios'... but i could swear that mine stock is 1.15... raising up to 1.2 yeilds 860/999 100% stable on both cards

mabye i just got 2 good samples iduno.

[TouGe]

anyone else having problems with catalyst 7.12 and modded bios in cf? i had to downgrade back to 7.11 because i get a black screen with the new drivers

Yeah, I had issues w/ the new drivers as well. Actually, my problems where w/ CCC.
After just installing the driver and ATi Tray tool all my corruption issues were gone.

[Truckchase!]

With the modded BIOS and the new 7.12 drivers my card won't go into 3d mode; it just stays at 2d clocks and voltages. Just installing the driver without CCC doesn't help. I'm looking for a solution, but haven't found one as of yet.

Anyone else with issues?

[ZenEffect]

im having issues with the 7.12 drivers as well. i dont have time to come up with a fix at the moment as im busy trying to get my q6600 to 4ghz

mabye in a few days ill post back with a fix if i can get it working.

[roger_h99.nor]

Guys, need some help on this one, my 2900 pro/xt is temporary out of action.

Did a bios edit (as many times before) and tried to edit the 2D voltage from 1.00 to 0.850. (Yes, I did it the right way)

Got an error (which I don't remember). After reboot it was silence and darkness.

Well, no problem, I'll just do a blindflash. Well, this did not work - cause there is no sign of pc booting (no beeps, no nothing).

Any ideas, before I get myself a cheap PCI card? Thanks.

[ZenEffect]

borrow one from your little sister?

[ZenEffect]

http://service.futuremark.com/compare?3dm06=4414800

any good guys? this is after 1 full day of tweaking on the new mobo

[dsturner]

Well guys I have been modding my card ( HD2900XT) with several Bios's and have even made my own custom one from 1.2volts to 3.5 volts from stock speeds to 900/1000 and after 14 hours of this I thought I found the sweet spot as it had the highest benchmark and totaly stable ...so life is good....NO!!!! I thought for a joke I would try the New 7.12 driver and use the overdrive to see just how far I left it in the dust......Guess what it benched 5 (only 5) marks higher...what the hell!!!!

Conclusion: Some how they are modding drivers without doing all the stuff like voltages and so on. There seems to be much more benefit to customizing the drivers than the bios period....hard to believe and I wouldn't have untill now.

So flash your PRO to XT and use ATI Overdrive for a simple but effective O/C

Totaly blew me away!!!

[super dank]

http://service.futuremark.com/compare?3dm06=4414800

any good guys? this is after 1 full day of tweaking on the new mobo

Very good I would say

About 300pts short of my '06

[ZenEffect]

Very good I would say

About 300pts short of my '06

my cpu + gpu arent clocked nearly as high as yours


hey i used to go to va beach all the time for soccer matches!

[ZenEffect]

Well guys I have been modding my card ( HD2900XT) with several Bios's and have even made my own custom one from 1.2volts to 3.5 volts from stock speeds to 900/1000 and after 14 hours of this I thought I found the sweet spot as it had the highest benchmark and totaly stable ...so life is good....NO!!!! I thought for a joke I would try the New 7.12 driver and use the overdrive to see just how far I left it in the dust......Guess what it benched 5 (only 5) marks higher...what the hell!!!!

Conclusion: Some how they are modding drivers without doing all the stuff like voltages and so on. There seems to be much more benefit to customizing the drivers than the bios period....hard to believe and I wouldn't have untill now.

So flash your PRO to XT and use ATI Overdrive for a simple but effective O/C

Totaly blew me away!!!

7.12 drivers dont work with my modded bios' and ati overdrive only lets me clock mem to 900

7.11 modded bios blew away my 7.12 stock bios with overdrive by like 1000 pts

[s0lid]

Could some body fix this bios files Checksum from 0DA0F to 0BD00

I'll try fix that by myself but it might take loong time ^^

[s0lid]

Ok checksum is now 0BD00 but could somebody check does these mods kill my 2900 pro ?

That is modified 2900 XT bios where i've changed device ids and bios version infos to pros Just in hope than with modded XT bios i get better OC
for exsample XT is 602-103 and Pro 605-100

is important than my radeon 2900 pro is still pro even when i flash that bios
I get more points as Pro in hwbot ^^

[Manicdan]

i have a 2900xt by asus, stalker version, on a msi k9a2-cf board running visat 32bit. and i simply want to have my volts raised from 1.2 in 3d to 1.35. my card is fully watercooled and modded to cool even better. my load temps are 40c, so im not scared of heat issues. and i can OC just fine using amdgpuclocktool, as it saves the 3d settings as it goes between 2d/3d but it has no voltage control, and ati tool dosnt work for crap for me, i just use to monitor things. my current limit is about 860/999, and i never get artifacts, just lockups when i push it to hard.

ive read everything in this thread and many of the threads you guys have linked and im just looking for a very small change, and the rest ill change on my own. i just want to know whats the safest way to increase my volts and how i should go about doing it,