SLI 460s at 1680x1050 will completely max out almost anything at great frame rates. Let the cards' automatic fan speed control do its thing.
That sound's promising mate . The next series of Nvidia and ATI cards would be out by the time i build my new rig . So, i guess i should wait to see if i would be better off with an SLI setup or a single card . Anyways thanks for the information on dedicated physx cards