Unexpected shutdown with GTX 280!
I was playing COD4 today for about 10 minutes when my computer just shut down. I was able to reboot with no problems, but this was totally unexpected. I have a 750W power supply, so that wasn't the problem. I did set dual-cards to "yes" in the graphics section. The next time I played, I set it to "no," and I played for an hour with no issues. Maybe that dual cards setting was the problem. COD4 plays great at 1920X1200 with 4X AA and AF set at max.
I also played Crysis for over an hour with no problems!