Catalyst 11.1a
I stumbled across this today didn't see it posted yet thought you all would like it. It works well on my unlocked 6950
http://www.techpowerup.com/downloads/1929/AMD_Catalyst_11.1a_Hotfix.html
You can add another successful Sapphire 6950 to 6970 Asus bios flash to the list.
Currently running 915Core 1375 Ram. I ran Heaven benchmark about halfway through at 940 core but it crashed, going to plug in the extra 4 pin power to my board tonight and try again.