I just got the EVGA GTX 580 3GB as well as a used GT 120 for my 2008 3,1 Mac Pro. I have the 580 in slot 1, the Red Rocket in 2, ESata Card in 3, and the GT 120 in 4. I have an ATI Power Supply feeding power to the 580. For some reason I cannot see the 580 in the system profiler. I am running 10.7.4 and have the latest NVidia drivers installed. When I disconnect the power from the 580, all PCI cards show up, but when the 580 has power going to it, the 580 and RR don't appear in the profiler. Do you have any recommendations?