I'm building a new computer on the AM2 socketing and am planning to use a PSU that i got from my cousin, which came with an Aspire case and that he gave to me when he replaced this one. It is 500W, and has 2 12V rails rated 18A and 16A. The rig I'm planning to build has a 3500 Orleans (which will be overclocked), an eVGA 7900 KO, and a 74 gig raptor (i don't know if sata devices go on the 5V or the 12V). Thanks if any1 knows.