250 watts is ok! I was able to get an Athlon 1.33ghz, 2 hds, vid card, modem, floppy, sound card, and a network card to run on a 100 watt power supply. Look at the list of approved AMD power supplies! These people here are quoting that AMD generally recommends 300 watt supplies, but that is not true! They approve 250 watt supplies also!