I have a 300W PS that I used in my older system which didn't lock up. I really only play Half-Life mods and Diablo 2. While playing my comp will completely freeze. If I alt+ctl+del the game is not listed in Task Manager and I get a blank white background. At this point I have to cold boot. I've had this card for several months but it's only been doing this for the last month or so. It seems to happen randomly. It could lock up after playing for 2 minutes or i can play 2 hours with out a problem. My system temps are stable, and I even tried leaving the case open just in case. Anyone else having problems like this with GTS cards?