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Using a Core 2 Duo E8500 we can see how Civilization V takes full advantage of the two available cores this processor has at its disposal.
With four processing threads available, overall per-core usage levels out using ~50% of each core. As you will see on our CPU performance tests it's a balance of this, clock speeds, and architecture efficiency that pushes performance on Civ V. The only hexa-core CPU we tested failed to deliver better performance, so it appears this game's usage maxes out at four cores.