ebaugh :
Im gonna build an awsome gaming computer, i just need to know, should i get a 2.4 GHZ q6600 core 2 quad or a 3.16 GHz e8500 core 2 duo?
He's right in that this question is asked on these forums every single day.
Generally though, most folks agree that the high GHZ Dual-Core CPUS beat out the Q6600 in overall gaming performance (for now at least). an E8500 or even E8400 can OC well, and beat on any game.
The Q6600 gives you a lot more versatility for multi-tasking. As future pieces of software are designed for multi-core processors, the Quad Cores may eventually beat out the dual-cores.
Q6600's are known to OC to 3-3.2Ghz pretty easily on air cooling.