thats odd i have a 350watt enermax thats running my 1800+ @2.4ghz w/3 harddrives,5 case fans,tt smartfan2,floppy,cdrw,dvd,crytal orb,gf3 ti200,asus a7n8x deluxe2.0 and i'm running 32hrs prime95 stable.plus i have other cool glow mod in the case :)
so i can almost say it's not your psu