19K is right about where it should be. Additional cores aren't going to be perfectly linear. You generally see about 6% reduction going from 2 to 4. Seeing a further 13% going from 4 to 6 isn't terrible. Nehalems seem to lose about 8% going 2 to 4 and a further 10% going 4 to 6 (Of course, the combination of Turbo and HT makes and kind of consistent/sensible comparison, even within the family, very hard.)



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