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Generally speaking, dual core's are better for gaming. This is not always true, but usually. I would go with the E8400 and overclock it. My reasoning behind this is it has a high clock and a higher FSB.
It depends how much you overclock it. If you're just adjusting the fsb and not doing any voltage changing, you'll probably be alright. It's a good idea to buy some Arctic Silver 5 thermal paste and use it instead of the crummy thermal paste that already comes on the processor.
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