I currently have a GTX 295 in this system that I recently built. The GTX 295 replaced my 9800 GTX+. I have been reading and seeing people use BOTH cards and use the 9800GTX for dedicated physx?!?! how do I set that up? Do I need a special cable to connect the two cards, or just plug my 9800 GTX+ into one of the free PCI-E slots, hook it up with power and go?