I have a 9 month old Antec 300w power supply that came with my case that says it has 15A to the 12v rail. I currently have an Asus mobo, Barton 2800+, eVGA 6600GT, and an 80 gig HD in there. Runs perfect. I'm upgrading to an ASRock Dual SATA2, Opteron 146, ATI X800 GTO modded to 16 pipes. Do...