You shoudn`t have problem with around 520W quality (OCZ... PC&PCP or something like that... Zippy...)... Me and Bigtoe were talking about that at CeBIT. 420W was enough to run a 6800U, 1Gb of ram, FX55, DFI NF4, 2x raptor, etc.... IIRC that are the correct spec, sorry Tony if that are not the actual part.