Please see this other thread for problem.http://www.tomshardware.co.uk/forum/page-262660_12_0.html
I have been straining the psu for a few years with all these cards I added.
A graphics card - Ati Sappire x1600, an ok one. Sound card - Herculese Digifire 2.7, pretty good one. Network card -wired. Card reader- loads of different cards adapters. And two dvd rom writer drives.