(account for PSU efficiency since it was measured from the wall 193*.9= ~174
a 760 uses ~170 watts [strike]so you're looking at
~344 watts.[/strike]
edit: oppsie forgot the 2 extra HDs - 8 watts each for
~360 watts
keeping the max load under 80% 360/.8=
450 watts as a minimum for the PSU.
FYI, it would not be wise to OC the 6350 with that motherboard since there are no heatsinks on the VRMs
the XFX 450 will be fine. (but the XFX 550 would be best if you can somehow). TBH, i would trust the XFX 450 over the EVGA 500, better quality components . .just saying.