I have a TT Purepower 480W PSU with 18A on the 12v rail, and I was wondering if it could handle a X1800XT? I'm currently running an A64 3000+ @ 2.2, 2 HDD's, 2 gigs of RAM, a DVD burner and various fans. I haven't noticed any stability issues so far, but I want to keep it that way, so would it be worth investing ~$100 on a better one? Thanks!