A few things to remember:
1. That PSU is a no name brand.
2. W = A*V
3. We do not know the breakdown of the amps on the +12 rail or if the wattage rating is the MAX output.
OCZ OCZ StealthXStream 600W
This PSU is much better quality and has the needed amps on the +12 rail.
Get a quality PSU from Corsair, PC Power & Cooling, Antec, OCZ.