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Flashing 6950 to 6970 question

post #1 of 5
Thread Starter 
Hello everyone biggrin.gif.
Ok this isn't a how-to question, I'm asking how that theoretically could be done? I mean, the 6950 got extra shaders from the bios flash. How was that possible?
Does the bios flash unlock like " virtual shaders "? Or the 6950 is basically a 6970 with disabled shaders? i.e, the 6950 physically has those shaders but they are disabled by AMD?
Thanks biggrin.gif.
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post #2 of 5
AMD initially used the same PCB and Cayman GPU for the 6950 and 6970, meaning they were identical except shaders were locked on the 6950. AMD locked the shaders via the BIOS (they could've done it on fuses inside the GPU or substrate, which would've been irreversible), hence if you flash a 6970 BIOS to the 6950 it would unlock the shaders. A lot of non reference cards aren't able to be unlocked if they use a different PCB or the locked shaders were bad.
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post #3 of 5
Quote:
Originally Posted by Skorpian View Post

Hello everyone biggrin.gif.
Ok this isn't a how-to question, I'm asking how that theoretically could be done? I mean, the 6950 got extra shaders from the bios flash. How was that possible?
Does the bios flash unlock like " virtual shaders "? Or the 6950 is basically a 6970 with disabled shaders? i.e, the 6950 physically has those shaders but they are disabled by AMD?
Thanks biggrin.gif.


Both 6950s and 6970s come from the same wafer, same die,same chip. AMD disabled the shaders via a bios lock. Towards teh end of the cycle life, they cut the shaders disabling unlocks. The chips are also binned for shaders, so you'll come across some unlockable 6950s that have errors when running unlocked. AMD didn't make this same mistake with Tahiti.
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post #4 of 5
Thread Starter 
Thanks biggrin.gif.
So in same sense, the 7950 is same as 7970 but the shaders are physically locked via the fuses or whatever method it is?
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post #5 of 5
Quote:
Originally Posted by Skorpian View Post

Thanks biggrin.gif.
So in same sense, the 7950 is same as 7970 but the shaders are physically locked via the fuses or whatever method it is?

Yes. Like I said, AMD didn't make the same mistake twice. You won't find an unlocked 7950.
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