The only game I remember to fully utilize my two cores was Gothic 3, Supreme Commander, Medieval 2 etc just use about one core, well they use two, but overall CPU usage stays around 50-60%. The new Mount&Blade also has Dual Core support it says but my impression so far was it uses about half of both cores. Another problem could be the graphics card though, if that is bottlenecking, the better CPU won't help a lot.
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