I'm selling my shader unlocked 6950. It's spent it's time at 810/1275 @ 1.057v when gaming/mining, so close to stock speeds and undervolted. I never tried to push it harder or further. It was stable so I left it at that. This card has the BIOS switch, so if for some reason you didn't want the shaders unlocked it would be easy to go back.
Card model is: PowerColor AX6950 2GBD5-2DH Radeon HD 6950 2GB
Price: 0.24
BTC + $10 shipping via paypal to US 48. I won't ship international or outside the US 48.
This particular miner is running headless, so excuse the poor resolution screenshot from VNC.
I know I have no rep here, but for those that are familiar with heatware:
http://www.heatware.com/eval.php?id=73397https://i.imgur.com/qwnjfFc.png