A friend just picked up a Sapphire Dirt 3 6950, it showed up on Monday. He played some BF3 with it on Monday night / Tuesday morning with it for quite a few hours with no issues, running 11.3 Preview 3 drivers. Then I had a BF3 LAN Party on Tuesday night, he came over and when he started it up right away and it looked like a bad PSU. He start bar split and the top icons would shift over, then some purple/blueish boxes appeared. So he turned it off. We tried his 6950 in my comp, it worked great. I tried my 6950 in his comp and it worked great, also tried a 5850 in his comp without any issue. Tried a different PSU with a bit more wattage, but a bit less amps with his 6950 and that had no problem as well. At this point I was confused as everything worked, just in different locations. He had a 5770 before and my advice to him was to do a complete driver sweep and try the Dirt 3 6950 again. But he tossed back in his card (this was at about 3pm Tuesday) and it worked fine. So he didn't bother doing drivers, we then played BF3 till 4am this morning (Wensday), so over 12 hours of BF3 straight. And his computer didn't throw a single fit. So he packed up and took it home, but when he started it there this morning, the problem is back. My guess is PSU or Videocard, Videocard is 2 days old, PSU is 3 weeks old, and both seem to work fine with other hardware? He is also running a Athlon II setup.