Well i ran mine off my 120w from ebay. (but i didnt do that long because i was gettin noise from it through my speakers, but i think it was just because i didnt ground my motherboard). As for how you should power it I dont quite know yet I have few problems that ima work out. I went out tonight and on my way home i ran into these problems again. Ima put back on my psu tomorrow and see if that helps.