The eXtremePower 650W is a rebadged older model Seventeam 500W, with +12V@30A and reasonably low efficiency. While it's still a reasonably good quality unit, make sure it's priced appropriately for that, and don't expect it to provide 650W. Coolermaster's Real Power Pro series is better, and there are more recommendations at http://www.computerforum.com/90117-ceewi1-s-psu-recommendations.html