To be fair, that's really only one perspective, Cinebench...other tasks might stress the system differently, and different platforms could show different power numbers. So it's not the best test to examine CPU power consumption Again, Lostcircuits showed that a motherboard alone can add or subtract 10W for the Phenom II. As for the Intel chipsets, I read the TDP's on the x48/58 aren't actually that high.
TDP's: ( i didn't see x58 on the list, i'll look for it elsewhere)
X48: 26.5 W, 12.3 W idle, with 333 MHz FSB
P45: 22 W, 9 W idle, with 333 MHz FSB
edit: X58: 20-24W, 8W idle





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