I've got a 1.33ghz AMD on an ASUS A7m266, 512mg DDR, 2x 7200 rpm 40 gig maxtors, geforce3, floppy, 12x10x10 lite on cdrw, 12x toshiba DVD (I think), and a s*load of peripherals usb'd, and a Hercules Gametheater XP with Rack, all in an Antec 1030SX case with 300 watt powersupply...
NO problems...