I've recently upgraded my computer, and among other things went from 2 8800GTS 640MB to 2 radeon 5850's. I've read in a number of places where people could apply a patch to use an ATI card for rendering and an Nvidia card for Physx. My question is will this work in crossfire? I'm using Windows 7 ultimate 64 bit with an MSI 790FX GD-70 motherboard. Also I have the power supply to run the 2 5850's and a single 8800GTS.