I don't know what the deal is...I thought this PSU was plenty for this card but ever since I've switched from ATI to Nvidia it's been nothing but TROUBLE. Every ATI card I've ever had played almost flawlessly.
Anyway I'm on a 9800GT right now and a 450W BFG tech. I can play most games but when I run on higher settings on let's say L4D2 the game freezes up and eventually the computer reboots and I can see some infinite loop error in windows system logs.
According to all the power supply calcs I use this PSU is plenty but I wanted a second opinion.
No, see the little voltage switch? That's one of the older BFG PSUs, that weren't all that great. I didn't find a review of that specific model, but I did find a thread that didn't speak too kindly about it: http://hardforum.com/showthread.php?p=1033757509 The LS models are good, but not the older GS ones.
This sounds more like a driver problem though. When you removed the previous [ATi] card, did you completely remove the old drivers?