It was time to upgrade my secondary video card on my trusty MacPro3,1. I first goofed considerably with a Radeon 5250. I even went so far as to bust out my old firmware editing tools to change the vendor id in a feeble attempt to get OS X to use it without needing to modify kexts. Then I heard that more recent nvidia cards are supported by NVIDIA’s “web” OS X drivers. I swapped the 5250 (with its firmware restored) for a GeForce GT 720.