Originally Posted by Brtnboarder495
Quad won't improve your performance in gaming unless the game supports multi-core CPUs, otherwise OCing a cheaper dual-core will provide the most bang for buck.
Considering the price difference between a q6600 and a dual core, its definately worth it for a quad core. Most games coming out from this point on DO support multithreading, so the quad core is going to come into its own very soon.
As far as SLI GT's go, do it. Fear my 18500 3dmark06 score with the rig in my sig.