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Anybody with enough cash to throw at the problem can build "the ultimate gaming PC". It's just a matter of finding the highest-end parts you can, surfing over to your favorite parts retailer's website, and mortgaging an arm, a leg, and both kidneys. A more interesting challenge is trying to build a gaming PC with budget constraints. Building the best PC you can for say, $750, is somewhat difficult. You have to make hard decisions about the critical components: video card, motherboard, RAM, and CPU. In an effort to make the CPU part of the decision a bit easier, AMD offers a broad selection of CPUs, most in the sub-$200 range. Clocking in at $119 MSRP, the Athlon II X4 645 promises an improvement on the already solid performance of the X4 640, at a price just over half of Intel's nearest equivalent, the i5 750. Stick with us while we put this pony through its paces.