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Skt 754 = non dual chanel, 130nanometer process
skt 939 = dual channel, 130 or 90 nm process.
90nm runs slightly cooler the 130 but to me it's not a big enough dif to pay the extra cash. As ric449 said, less volts doesn't always mean less heat(as in the case of Prescott pentiums), the problem there is the power leakage caused by the transitors being so small and the extended pipeline. I may be wrong in saying this part but i think the P4 northwoods run like 10 degrees hotter than northwoods. Well that's just an example.
As far as dual channel with Athlon 64s, it really makes no big difference because of the huge bandwidth of the processors.
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