i7 4 cores will run 8 threads, my i7 990X is 6 cores and runs 12 threads (though Vue is limited to 8 threads max). Overclocking helps. All threads are equally fast, speed is temperature-driven (higher temp=lower speed). TMonitor (freebie on the net) can tell how speedy your individual threads are at runtime. Speccy (freebie on the net too) can tell you about the temp of the individual cores.

Why run 7 or 11 threads? Just manage your priority settings. This is how: http://www.book.artbeeweb.nl/?p=162 

have fun

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though