iraiguana said:the seasonic 600W psu is excellent if a tad overkill.
also the cpu you could always replace with a opteron 165 or 170 as these can then be overclocked further than the X2's and are not too much more. hope i have not made it much more confusing (also they work on both the boards you have suggested).
They can't. Current stepping Opterons do not clock as high as current stepping X2s