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[hibikir0984]

The Q6600 is actually 2.40GHz, however in recent times clock speed stopped being the primary measure for the power of a CPU. The Q6600 is 4 very powerful cores running at 2.40 GHz and should be enough power for the best games for next couple of years. If you're particurlarly daring its possible to overclock it up to 3.0GHz.

You're going to need a motherboard, power supply (definitely don't skimp), and probably a Creative X-fi for gaming. You'll also need to consider the drives you want: optical, hard drive, floppy (if you need it).