Hi! Im new, so probably you answered this question before, have mercy with that and my bad english. I've got this 8600GT, and isnt the best thing to play Assassins Creed or my future Clear Sky, so im planning to upgrade to a ATi 4850. But that isnt the point. The point is that I like nVidia GPU acelerated physics. So, i can plug a 4850 in my first PCIe 16x slot, plug the 8600 on the second PCIe 4x slot and install PhysiX driver? It depends on the GeForce nVidia drivers? What should i do to get nVidia PhysiX on the 8600 and the ATi 4850 as main GPU to work perfectly?