I'm thinking about getting second 6950. Unfortunately I can't find Twin Frozr III in my country to pair with mine, so I decided to go with XFX, Sapphire or HIS (maybe reference MSI :? ). I have a question, does any of these refference cards have a BIOS switch and can be flashed to 6970? I just unlocked shaders on my Twin Frozr III so I'm not sure if I will flash the second card to full 6970. Probably only unlocking shaders too. I hope my PSU will handle two 6950.