Nvidia PhysX pack due shortly
bit-techFuture driver releases will allow assigning of PhysX to a separate GPU - so if you upgrade from a GeForce 8800 GT to GTX 260 for example, the GT can work on PhysX data only. We double checked and you do not need an SLI board to do this - just one with multiple PCI-Express slots - great news for those with X38, P45 or even P35 boards - we can't imagine PhysX needs that much bandwidth if previous hardware used a PCI interface!