AMD Athlon II x4 620 ggabyte GA-MA785GMT-UD2H 785gchip ATI Radeon HD 5850 GSKill ddr3-1333 4gb RAM Western Digital 1Tb Caviar Black 7200rpm windows home premium 64bt coolermaster extreme power plus 600W ATX 12v Antec 900 SO had ncix build me a 1200 gaming rig, and in order to get the 5850(waiting on it), had to compromise on the processor to stay on budget. Will it slow me down? Can I overclock with stock cooling? Comments in general?