>>713343278No he doesn't need a 1000w PSU, full load hes probably not hitting 700w 1ms peaks, far less in a typical game
The autism of power factor for AC to DC conversion and PSU efficiency is something I'm not even going to address. Having a little bit of headroom is always good though. Don't think that the wattage rating of a PSU means its always drawing a ton, it just has the potential to handle more current at a certain level of efficiency.