Quote Originally Posted by tool_462 View Post
Doesn't matter as long as it is a reference card BIOS. You can choose from the stock 6970 BIOS or use the 6950 BIOS with unlocked shaders with the tool available from Techpowerup.
I'll have to take a look at the 6950 bios with unlocked shaders. I have heard that is more preferred than flashing to a 6970 bios because the latter increases the voltage and this may damage the memory.

Not sure if it is true, but I don't want to risk damaging the card.