I have seen a lot of confusion on the forums about unlocking the shaders on a 6950. I have also seen a few people on the forums brick a non-reference or 1GB model by just flashing a 6970 bios. Even on a standard 2GB reference card there is a better way. This should even work on the 1Gb models and seems to work on non-reference cards, just be aware of the risk if your card doesn't have a dual bios.
What this will do is just modify the bios that shipped with your card. Of the three cards that I have used this on all three have been able to hit at least 6970 speeds while running cooler and more quietly than using a 6970 bios due to the lower voltage.
This will still take some common sense There really are some people that shouldn't be flashing a vga bios. I take no responsibility for any damage done. I find this to be the easiest way but if you are using a card with no dual bios I would flash with the dos version of Atiflash. Sure this will work but the chances of any issues popping up in the dos version are a bit lower.
I have never written a guide of any sort so I'll do my best. So here it goes.
Step 1
Download Gpu-z and use it to save the bios on your current 6950.
In gpuz hit this button and select "save to file". Save anywhere that you would like. It would be a good idea to keep this copy as a backup.
Step 2
Download the utility that will actually modify the bios HERE and extract the archive.
This is what you should see in the extracted folder.
Step 3
Now it is time to place a copy of the bios that you backed up into the folder that you just extracted. On the reference 6950 it should be named Cayman by default.
Step 4
Now you need to rename the bios to "original".
Step 5
Now you just need to run the batch file (.bat) named run and follow the directions on screen.
Now you have a shader unlocked bios. It should be named "modded".
From this point out you could just use the Techpowerup Guideand just use the bios that you just modded instead of the 6970 bios.
Step 6
Download the latest version of ATI Winflash from here and extract the archive.
Step 7
Run "AtiWinflash" as an administrator.
Step 8
Select "Load Image" and select the bios that you modified in step 5 named modded by default.
Step 8
Now select "Program" to flash the bios.
Step 9
If all goes well Atiwinflash will flash the bios and ask you to reboot the computer.
As stated in the Techpowerup Guide
I had to do this with one of my cards.If you get an error like ID mismatch or Could not erase ROM, then you'll have to do some extra work in a Windows command prompt (or DOS): Run atiwinflash -unlockrom 0 followed by atiwinflash -f -p 0 bios.bin where bios.bin is the path and filename of the HD 6970 BIOS you downloaded.
Step 10
Check GPUz to see your new shaders.
Overclocking
Download Sapphire Trixx. I found this to be the easiest way to overclock past the CCC limits. This utility will also allow you to modify the core voltage and set up a fan profile. Sure you can use Afterburner but you have to jump through some hoops to set everything up. You can also use Trixx to disable ULPS which is a necessity for crossfire. I still use Afterburner for the OSD though.
I hope that this guide helps someone. I would like to thank Wizzard from Techpowerup for the original guide, the bios modding script, Trixx, and GPUTool which I use to test my clocks.
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