Hm, would you think a Seasonic SS-401HT (400W) would suffice? 29A in total, and I will only be using one DVD drive, a single core CPU and one, maybe two HDs. I heard a lot of good stuff about this PSU and it's been highly recommended in some German silencing forum, which is usually quite reliable (but those guys don't use GeForce 8800s

)
OUTPUT +3.3V +5V +12V1 +12V2 -12V +5Vsb
30A 30A 14A 15A 0.8A 2A
PS: My brother's X1900 XT runs fine in my system, been testing is for a couple of hours now. It draws 9-10A in Flight Simulator X, and more than 20A and up to 30A in the ATI Tool "Scan for Artifacts"? Is it really drawing that much power?