How to Modify Your HD2900 BIOS Clock Frequencies by Hex File

[Truckchase!]

Seems odd that it gives a 500mhz boost in memory clocks

weird.... there are some very minor differences between the bioses that I can't account for...

[keenan]

What is your max memory clocks with your bios..?

[Truckchase!]

What is your max memory clocks with your bios..?

About 920 in most games, with the weird exception of Splinter Cell: Chaos Theory and BF2142. In those two games I have to take it down to 900.

After I finish testing Pro vs. XT BIOS, I'm going to move on to trying your BIOS.

[roger_h99.nor]

@Martin.
Could you please explain what we could learn from those 2 links you provided?

Regards.

[Truckchase!]

Strange thing tho, with my default bios, I can get 875/2490 dont know if this is max memory, but that is as high as rivatuner goes

But with your bios I can only do 900/2000. Anything above 900mhz core and my pc would freeze and anything above 2000mhz on the memory gives nice red artifacts

So, does my bios relax the memory timings or does it have a higher voltage on the memory..?

Seems odd that it gives a 500mhz boost in memory clocks

I tried your bios and did a benchmark suite at the same speeds as my modded bios. Any differences were within a 1% margin of error, so I don't believe memory timings are different. I'm going to see how high I can take the memory tonight.

[keenan]

Thanx for all this effort, I look forward to your findings...

[003]

Hey could anyone make some new volt modded bioses for the 2900pro 1gb that have the "checksum fix" detailed right here:
http://www.xtremesystems.org/forums/...56#post2580556

Here is the stock bios:
http://www.techpowerup.com/vgabios/9...24.070809.html

Could someone do this and have 4 different versions, 1.20v, 1.25v, 1.30v and 1.35v? This would be really great because otherwise me and everybody else with an abit motherboard can't flash our bios

[EXPANDER]

My 2X 2900PRO-XT MOD CF MODE 1000mhz gpu Test 3DMARK2006: http://expander.blogcu.com/

[GLENBOY]

nice one expander how you getting the 1.4 volt everyone seems stuck at 1.35volt

[Truckchase!]

nice one expander how you getting the 1.4 volt everyone seems stuck at 1.35volt

He's gotta be using ATI Tool or something...

[Truckchase!]

I tried your bios and did a benchmark suite at the same speeds as my modded bios. Any differences were within a 1% margin of error, so I don't believe memory timings are different. I'm going to see how high I can take the memory tonight.

No luck, my memory still sucks. I don't know why my BIOS negatively impacted your clocks... your BIOS didn't positively impact mine, so I don't have much to correlate.

[ZenEffect]

this topic mostly pertains to abit users, and how when hex editing the bios of our 2900xt's we get no video output. the root of this problem is that the file checksum changes. i.e. a unmodified, true bios file checksum would have 0xD200 (when checked with atiflash -cf filename.bin) after modding it the checksum becomes 0xD201. i took the easy route and changed my clock values with the quantumforce 2000xtbios tool then opened a hex editor. i looked for data that could be expendable (pick below, look to the right and ive changed some text that i will never ever ever see) and changed its values until the checksum
matched the genuine bios. (kept going back and forth between hex editor and atiflash -cf, though there are hex editors that can give checksum) when they did match, i flashed my 2nd card and viola! i get device id info, product name etc... just as if i flashed with a legit bios. so then i flashed my 1st card with the same bios and crossed my fingers then rebooted. I HAVE VIDEO W00T! bios' took and all is running well. hope you guys understand my babbling and pass on the word. here is a sc of what i did in the hex, the top window is the origional and the bottom is modified. look to the right to see what "expendable data" im talking about to get a good checksum some garbage about how you are a noob and you didnt connect the power cables





apparently only abit users need to go this extra step. im sure there is a more elegant solution based on what i did but whatever, it worked for me!

here is the bios, i believe its a 870/990 bios with 1.25 volts 512MB. took the origional from techpowerup BIOS database and is the Hynix 1.1 club3d bios (i made about 50 different ones and im a stoner with no real good labeling system)
at fan locked in at 100% i barely hit 73c with stock hsf



this really really works and wont brick your card

i use an abit ip-35 pro w/ 2 2900pro/xt bios in cf. i tested on 2nd card first to see if i got the blank info or not. blank info = no video for abit

[keenan]

Which bios has better performance, the Pro ot XT...?

Can I flash my XT with a Pro bios..?

[Truckchase!]

Which bios has better performance, the Pro ot XT...?

Can I flash my XT with a Pro bios..?

I think the BIOS has tighter mem timings. I flashed mine, but my mem was no longer stable at the same speeds that it's stable at today. Even if it's faster clock for clock, I figured it would be a wash when you figure in that it won't scale as high. You can give it a try if you want, however... I saw no ill effects from doing so. You'll just have to let the drivers re-initialize since your PC will think you changed graphics cards.

[ZenEffect]

I think the BIOS has tighter mem timings. I flashed mine, but my mem was no longer stable at the same speeds that it's stable at today. Even if it's faster clock for clock, I figured it would be a wash when you figure in that it won't scale as high. You can give it a try if you want, however... I saw no ill effects from doing so. You'll just have to let the drivers re-initialize since your PC will think you changed graphics cards.

^ all stated above is true, the 2900PRO will NOT clock as high as an XT (coming from a PRO owner)

[003]

*borat voice* GREAT SUCCESS!!

This has been said twice now but there is a fix for abit users! Once you do the volt mods to the bios in the hex editor, you then have to change some values so that the checksum (using the command "atitool -cf filename.bin") of the volt modded bios is the same as the checksum of the stock bios. The checksum of the stock 2900Pro 1GB bios is 0x7000.

All I changed to make the checksums match were some letters in the warning about something not being connected that is coded in the bios (very close to the top).

I volt modded the bios to 1.25v in 3D mode. Here it is if you want to use it:
http://www.mediafire.com/?0ldd0gdjxjn

EDIT:
Oh yeah, forgot to mention, I tested it (using it now) and it works great!

[cepoi]

hello guys..im new to this forum..im using Abit AW9D-MAX mobo and need to do some extra step to my modded bios..now after chechsum bot original n mod bios, what should i do next?? im still confuse here

[cepoi]

atlast..both checksums are equal.. , but the sentence "YOU HAVE NOT ..bla bla bla" looks so terrible

[003]

All I had to do was modify three letters in the word connected. Just add a bunch of Z's, and check your checksum, it should be higher than you need. Then remove Z's and to tweak, take one of the remaining Z's and experiment with letters earlier in the alphabet.

EDIT:
Oh here's a great freeware hex editor:
http://www.chmaas.handshake.de/delph...vi32/xvi32.htm

That is the one I used, it works great.

[Martin.v.r]

where he got this bios tool from ?
http://www.iax-tech.com/video/3800biosmod/01.htm

[super dank]

The program's icon would seem to indicate an AMD tool...

(as you probably saw)

At first I thought those iax tech ones were done manually.

[TouGe]

So I moded the shroud covering my HD2900XT's yesterday. I took a dremil and cut a rectangular hole from just behind the 1st crossfire link all the up to were the curvature ends for the fan shroud--exposing the two heatpipes on the heat sink. I then placed a 120mm fan right in fornt of the opening and I also have a case fan blowing inwards as well.

Previously @ 1.2V I could barely get 840/1150 stable and the core temp maxed out @ 84 degrees while playing CoD4. Now I am at 860/1000 @ 1.25V and the core temp maxed out @ 82 degrees playing CoD4 for an hour. I was also able to pass multiple3 loops of 3DMark05/06 w/o any freezes.

I have not tried to max out 1.25V yet but I will try 880 later on this weekend.

Just thought I'd share.

[Don Quichote]

^^^^ A ludicrous suggestion; don't try it. This will easily brick your card, and youl'll need another adapter to re-flash.

I think most ppl are using the editor now anyway.

[cepoi]

why overdrive cannot be use in crossfire.?

[Guz]

So I moded the shroud covering my HD2900XT's yesterday. I took a dremil and cut a rectangular hole from just behind the 1st crossfire link all the up to were the curvature ends for the fan shroud--exposing the two heatpipes on the heat sink. I then placed a 120mm fan right in fornt of the opening and I also have a case fan blowing inwards as well.

Previously @ 1.2V I could barely get 840/1150 stable and the core temp maxed out @ 84 degrees while playing CoD4. Now I am at 860/1000 @ 1.25V and the core temp maxed out @ 82 degrees playing CoD4 for an hour. I was also able to pass multiple3 loops of 3DMark05/06 w/o any freezes.

I have not tried to max out 1.25V yet but I will try 880 later on this weekend.

Just thought I'd share.

Touge have you been able to perceive any improvements in benches. Like in 3dmark or crysis??

I say so, cause in my case overclocking does not yield ANY improvement in benches or fps.