The time came to upgrade my trusty MacPro3,1 to macOS Sierra. As many know, El Cap is the latest build of OS X macOS that supports this platform. How to a MacPro3,1 on Sierra is well-documented, nevertheless this blog is half just a diary that I use to re-trace my steps later.
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.