Well, I went to xfx's website, and they have no power requirements for their cards that I could find, but I did find some for other manufacturers, and they all came back with minimum of 400 watt power supply. Paired with that high power munching processor your running there, I would definitely say your p/s is your problem. You can get 600 watt power supplies for under 100 bucks these days, and with the future systems only requiring more power it seems, I would definitely get yourself one. Of course, I could be wrong....
