How to Modify Your HD2900 BIOS Clock Frequencies by Hex File

[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.

[Guz]

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

Sounds good and all but at least in my case i cannot get the cards stable past 850 on the core. Increasing vgpu does completely nill to the setup's stability. Furthermore some games get artefacts past a certain overclock. Also heat is not on issue since both cards are watercooled. I guess for me a ten percent increase is not really worth it.

[Truckchase!]

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

The 2900 is nearly completely GPU bound. Too much memory bandwidth for it's own good.

[Triccio]

hi guys i'm am not able to modify the hex code so i prey if you will make for me this bios mod for my Sapphire 2900pro 1GB

Gpu 850@1.25v better if 1.275
Gddr4 1000@1.7v better if 1.75 (i would take 1200mhz or 1100 with agressive timings)

at stock voltage (1.1v) my 2900 get stable 850/1050 in game and bench 880/1100 max.

Thanks in advanced

[MTP04]

Looks like DFI board are affect by the checksum mismatch aswell, atleast my LP P35 is. I don't know much anything about hex but I sorta understand what needs to be done to fix the checksum. But when I look at my modded bios (which is only raised volts to 1.3v) the area where everyone is making the corrections is already fine the way it is.

So where else can I make the correction?

EDIT FIXED: I figure it out, just played with a few different letters in the word "CONNECTED" till I got the checksum I was looking for.

[Triccio]

Looks like DFI board are affect by the checksum mismatch aswell, atleast my LP P35 is. I don't know much anything about hex but I sorta understand what needs to be done to fix the checksum. But when I look at my modded bios (which is only raised volts to 1.3v) the area where everyone is making the corrections is already fine the way it is.

So where else can I make the correction?

so the checksum mismatch is the cause of my black screen after flash a moded bios ?

I have dfi infiniti dark p965s

[MTP04]

so the checksum mismatch is the cause of my black screen after flash a moded bios ?

I have dfi infiniti dark p965s

I have a different DFI motherboard than you but I think your in the same situation as me.

[Triccio]

I have a different DFI motherboard than you but I think your in the same situation as me.

if you fix the checksum does it function??

when i flashed modified bios with quantum force without fixing checksum i had black screen .... so i tried to reflash the original but nothing to do!!

i resolved flashing the orginal XT bios and this is strange because it has a different checksum of 2900pro bios.

So i have a little panic to reflash the original bios but maybe if i try ones of techpowerup maybe it can work well.

In these forum i have noticed that a memeber have attached a 2900pro bios modified @1.25v with fixed checksum. Can i flash it if i have now the original XT bios with different checksum?

Thanks

[MTP04]

Triccio, I am not 100% sure but I think each card has a different checksum in their bios or at least most are different...so flashing your card with bioses from techpowerup or wherever might not solve your problem unless these bioses have the checksum you need.

[Triccio]

Triccio, I am not 100% sure but I think each card has a different checksum in their bios or at least most are different...so flashing your card with bioses from techpowerup or wherever might not solve your problem unless these bioses have the checksum you need.

i can't explain to myself how it can be possible do a correct flash from pro to xt orginal bios if the pro bios has cheksum 0x700 and xt bios 0xC00.
Also in the case checksum are different but flashing works.

Maybe both checksum are accepted because 2900pro doesn't differ from XT excepted for frequencies.

If i do the bios mod on a different motherboard (ex. Asus) can i resolve the problem?

[003]

The 1gb pro is 0x700. The 512mb pro is different. I made a checksum corrected 1.25 vgpu bios for the 2900pro 1gb earlier in this thread, here is the link:
http://www.mediafire.com/?0ldd0gdjxjn

And, the math behind the checksum has been cracked:

about us abit users and our checksum fixing.

ive figured out the math behind it, its rather simple actually.

#1 there are numbers and letters in order from least to greatest is 0-9 then A-F (representing 10, 11, 12, 13, 14, 15) then it loops back to 0

#2 when this numbering system is taken into account you can compare the checksums to see what the difference (#) between a modified and unmodified bios checkums... i.e. (just did this 1 in 1 try) unmodified bios is 0xD200 and the modified bios is 0xD1D1.. thus the checksum numbers are ordered as follows... 0xD200 > 0xD1D1.

so to find the difference between them (an actual numerical value) you can count/calculate it. for example the difference between 0xD1D1 and 0xD1D2 = +1, 0xD1D3= +2... 0xD1DF= +14... 0xD1E0= +15... 0xD200 = 47.

so the numerical difference between 0xD1D1 and 0xD200 is 47

47 converted to hex is 2F

so what do we do? we insert the calculated checksum difference in hex (2F) in 2 00's in the no power cord message to get matching checksums.

finally, no more guesswork!

[Triccio]

The 1gb pro is 0x700. The 512mb pro is different. I made a checksum corrected 1.25 vgpu bios for the 2900pro 1gb earlier in this thread, here is the link:
http://www.mediafire.com/?0ldd0gdjxjn

And, the math behind the checksum has been cracked:

i have a sapphire 2900pro 1gb flashed to xt

can you think that your modified fixed bios could work on mine even if now i have Xt orginal bios with a different checksum?'

This mod is only for abit user or can works also for dfi one?

[ZenEffect]

i have a sapphire 2900pro 1gb flashed to xt

can you think that your modified fixed bios could work on mine even if now i have Xt orginal bios with a different checksum?'

This mod is only for abit user or can works also for dfi one?

wont know till you try now wont we?

[MTP04]

If i do the bios mod on a different motherboard (ex. Asus) can i resolve the problem?

Nope, I tired that with a Asus P5k-E and didn't work.

[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

[roger_h99.nor]

Thanks - will have a look at it.

Tried this tool?
http://rapidshare.com/files/71500253...IOS_Editor.zip

[roger_h99.nor]

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.