Well, seeing as how I have a 400 watt PSU and I have all pci slots filled, agp Radeon 9600 Pro, 3 HDD's, 2 Optical drives, floppy drive, 4 light up case fans, cpu fan, northbridge fan, Hardcano Harddrive cooler with fan, 3 Laser Projection LED's, UV Light and Floppy drive with no problems and...