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I didn't know the P4's were doing it, but it makes sense. Anyone running P4 SMP with hyperthreading? Dual or Quad?
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P4 does not do SMP at all, that capability is reserved for the Xeon family (which are built on a P4 core, but are in the 603 pin packaging instead of the 478 pin)... P4's w/ hyperthreading enabled do not constitute SMP operation. hyperthreading doesn't benefit most of the tasks people here perform on PC's... video encoding, gaming, won't garner any benefit from hyperthreading, but things like chewing through large flat database's, working w/ huge datasets for molecular modelling, that is where hyperthreading really starts to add some benefit. fire up Mathematica or Reveal on a hyperthread-enabled machine, and you'll see the technology start to shine..