March 30th, 2015, 11:02
Surely it's a matter of arithmetic? Some sites have calculators where you can enter motherboard model, processor, memory, HDs, video card etc and it spits out a power requirement. If your kit needs 500W you'd be daft to get a 400W PSU! Type computer power calculator in Google and you'll get a bunch of hits. Then get a decent-quality one of the needed size.