I shouldn't expect that nVidia can write drivers to work well in an aging mac running the newest macOS, but I had to remove my 750ti last night after repeated freezes and kernel panics. I need to move to an AMD card. I've read all the threads, is the final conclusion that the rx480 is working solid with Sierra, or is the rx470 the recommended route? Mac Pro 2009 flashed to 5,1. The usage is mainly in the mac realm: video rendering type of things with a 4k screen. Not much gaming.