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Looking at the results it obviously comes down to which games you are playing, and plan to play, that will dictate how many cores you are going to need. As a rule of thumb we suggest all gamers look at making the transition to a quad-core processor, as we found more than half the games we tested with saw significant gains when going from two to four cores.
The biggest issue we found when playing games that could properly utilize four cores was that a considerable amount of performance was lost when using a dual-core processor. Take the Core 2 Duo vs. Core 2 Quad debate for a moment.
When comparing equally clocked processors the Core 2 Duo was on average 19% slower when testing with Battlefield Bad Company 2, Far Cry 2, Supreme Commander 2, Splinter Cell Conviction, Mass Effect 2 and World in Conflict. Furthermore, the minimum frame rate was 23% lower, which is a massive difference for the processor to make and will certainly be noticed in-game.