This M12-II is enough for powering any reasonably configured computer. I got a C2Q Q9550, 4GB RAM, GeForce GTS 250 and two harddrives. This PSU handles it with utter ease. Measured pull from the wall socket is about 250W under normal use. With about 85% efficiency, that's 215+ watts from the PSU DC side. And people get 1000W PSUs when they don't need one.