I was looking at some benchmarks online at several different video cards including the 5670 and higher end cards. On a benchmark test of how much power the whole computer system took while playing Crysis, was only about 214 watts. So I think it might run, but I will definitely not keep it on a wattage this low in the long run. I will, as soon as the money comes my way, get a 500 watt+ psu. As for the name brand of the stock 305 watt psu...I have no idea. I cannot find any name for it on the Sony website or anywhere else. I am sure it is a name brand because it had to be made somewhere, right?