I'm thinking of tweaking my gaming PC and I'm after a few suggestions. I won't be spending any money on additional components, unless you count cooling. Specs are one of two choices but either one will have a Coolermaster Mystique 631, GTX 280 OC2 and an OCZ Stealth Xstream 650W. Only one hard drive. Choice 1 Phenom 620 ASUS M4A78LT-M LE 2x Kingston 1GB DDR3 1333MHz HyperX (7-7-7-20) Choice 2 Core 2 Quad Q6600 Gigabyte GA-G31MF-S2 2x 1GB DDR2 800MHz Crucial Ballistix (4-4-4-12) Which one should I use if I want to overclock for a nicer performance? Gaming only. Also, what would people recommend for a decent cooler? I'm after bang for the buck that can do the job for whichever one is chosen out of the two. Not overly bothered about sound, as long as it doesn't sound like an aircraft taking off.