Good to know I'm not alone in this, I have looked briefly into this wprime stuff myself.
In Vista at stock speed my E8400 acctually had it's fastest wprime with 16!!! threads, consistently.
With a 4.5GHz OC it ran fastest with 4 and 6 threads. Couldn't really find any consistent winner, but optimal threadcount was much different than for stock speeds.
My point; the optimal thread count is different for different chip-architechture, and it changes with the overclock of the cpu. This bench needs a few runs at various threadcounts to establish where it will run best. Also keep in mind that you should run it at least 4 or 5 times. Sometimes run #2 or run #3 or run #4 will go considerably faster (~1/2 tenth of a second faster for a core2 duo?) that the others.
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