How to Modify Your HD2900 BIOS Clock Frequencies by Hex File

[Martin.v.r]

Praimm
try a:atiflash -f -p 0 name.rom

[askimo]

I somehow agree with Guz that it is not tangible or significant improvement in the fps when you overclock the GPU.

Must be something to do with the timings of the memory because I cannot feel the games running faster with my naked eyes

For sure the GPU runs hotter with the new bios (currently at 830/950), which confirms the increased speed in the GPU.

Can somebody post results pre and post bios mod? No 3Dmarks please

[andre X_X]

could someone help me modified this bios to 1.25v and 1.3v 850/920 just perfect. i'm using Abit X38 mobo and never success to make the correct checksum, always black screen after reboot

thanks....

[TouGe]

I somehow agree with Guz that it is not tangible or significant improvement in the fps when you overclock the GPU.

Must be something to do with the timings of the memory because I cannot feel the games running faster with my naked eyes

For sure the GPU runs hotter with the new bios (currently at 830/950), which confirms the increased speed in the GPU.

Can somebody post results pre and post bios mod? No 3Dmarks please

I ran the World in Conflict benchmark and I did not see any improvement in framerates with my card overclocked, in fact, gameplay was more jerky w/ my GPU OC'd.

Benchmark test was run @ 1920x1200 w/ settings on high w/ the exception of World Distance set at medium.
850/1000/1.25V: 32/14/73
840/1000/1.25V: 32/14/73
820/1050/1.20V: 33/14/86
800/1100/1.20V: 34/12/88
780/1050/1.20V: 33/15/84 <-- Stock Settings

I'm not sure how GPU bound the WiC benchmark is but this game has been a biatch to get running smoothly so I've been spending alot of time trying to get this going more smoothly. It would help if ATi could get CF running......

[askimo]

I ran the World in Conflict benchmark and I did not see any improvement in framerates with my card overclocked, in fact, gameplay was more jerky w/ my GPU OC'd.

Benchmark test was run @ 1920x1200 w/ settings on high w/ the exception of World Distance set at medium.
850/1000/1.25V: 32/14/73
840/1000/1.25V: 32/14/73
820/1050/1.20V: 33/14/86
800/1100/1.20V: 34/12/88
780/1050/1.20V: 33/15/84 <-- Stock Settings

I'm not sure how GPU bound the WiC benchmark is but this game has been a biatch to get running smoothly so I've been spending alot of time trying to get this going more smoothly. It would help if ATi could get CF running......

Thanks for the benchies TouGe

You confirmed my theory that is no improvement in running this card overclocked. The increase in speed doesn't translate in more fps just more heat and noise, but what is the real reason for this behavior? Are really the table timings affecting the performance of this card?

[roger_h99.nor]

Can confirm that at least Crysis scales very well with higher clock on GPU.

[Guz]

Can confirm that at least Crysis scales very well with higher clock on GPU.

How well is "very well" ?? For me an overclock of 820/950 only meant going from 31 fps timebench at stock speeds all the way to a mere 34 fps. That's like a ten percent increase but really gameplay-wise i consider that mediocre at best.

[roger_h99.nor]

31 fps --> 34 fps = 10%
743Mhz --> 820 Mhz = 10%

I seldom see games respond to OC as well as this.

To compare (my results):
743 core gives 40-42 in Crysis
900 core gives 50-55 in Crysis.

Settings:
x6800 @ 3,5
Crysis: 1680 x 1050, everything at 'Medium', No AA.

Regards

[Guz]

I ran the World in Conflict benchmark and I did not see any improvement in framerates with my card overclocked, in fact, gameplay was more jerky w/ my GPU OC'd.

Benchmark test was run @ 1920x1200 w/ settings on high w/ the exception of World Distance set at medium.
850/1000/1.25V: 32/14/73
840/1000/1.25V: 32/14/73
820/1050/1.20V: 33/14/86
800/1100/1.20V: 34/12/88
780/1050/1.20V: 33/15/84 <-- Stock Settings

I'm not sure how GPU bound the WiC benchmark is but this game has been a biatch to get running smoothly so I've been spending alot of time trying to get this going more smoothly. It would help if ATi could get CF running......

I'm pretty sure CF is running in Wic, i get almost the same numbers as you do Touge. If memory serves me right, benching with one card gives lower results. Just to make sure turn off CF and do another run.

[TouGe]

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.

I ran the World in Conflict benchmark and I did not see any improvement in framerates with my card overclocked, in fact, gameplay was more jerky w/ my GPU OC'd.

Benchmark test was run @ 1920x1200 w/ settings on high w/ the exception of World Distance set at medium.
850/1000/1.25V: 32/14/73
840/1000/1.25V: 32/14/73
820/1050/1.20V: 33/14/86
800/1100/1.20V: 34/12/88
780/1050/1.20V: 33/15/84 <-- Stock Settings

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......

[mossad]

hi there, is there any1 with modded bios for sapphire 2900pro 512mb gddr3 256bit? after install of 7.12 cat my rivatuner oc is useless cause it hold the oc via rivatuner but when runing 3d mark 06 , in last 2 test cards not OCed like had to be 770/1100 but only for stock 600/800 for 3d.
ok and here we go, i readed all blahblah about bios editing and tried my doing i found there is frequencies on many places in the bios so i am deep in sh...
also this card has 1V 2d and 1.08V 3d which hold my core on 770mhz...
can any1 advice how to find which numbers are the correct one if they r on many places? cause all normal tools which edit 2900xt bioses are unable to work for my card as it uses pcb from 2900gt i think, cause its 256bit, only one 8pin conector for power... my 2d is 506/513 and 3d 600/800... seting 3d voltage to 1.2-1.25V can boost my oc well i think if there is no danger in power circuits as it been designed for lower power draw...
any advice welcome...

http://img222.imageshack.us/my.php?image=ocge3.jpg

[roger_h99.nor]

Welcome to the forum

Post your bios here, If it's similar to the 512bits bios it's easy to mod it.

Have you tried the Foxconn-tool yet?

Regrads.

[mossad]

this is my original sapphire bios : http://www.mediafire.com/?7bgddxsjnlh
as u wish ;]
also i tried some util especialy for 2900xt bios edit oc but i dunno if it was that from foxconn but it wont work for my 256bit card cause there were no frequencies in the boxes where they had to be

[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.