AMD fx-8320 vs. fx-6300?

AMD fx-8320 vs. fx-6300? I can't decide whether I should get the 8320 or 6300. Would the 8320 make a huge difference in gaming? The 8320 is $140 at Microcenter, but if I get it I'll also have to get a better power supply, which is another $30 or so. The 6

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