I have a Mac Pro 4,1 with 5,1 firmware to get Sierra installed without any hacks. It currently has a flashed Radeon HD5870. I'm looking to upgrade the video card and want the best bang for buck route that I don't have to deal with constantly (if possible). I've read Sierra natively supports Polaris cards now so I was looking at an RX480, but I read that the last update killed it. nVidia cards I've never dealt with but I think require a web driver install after every OS update? Just looking for some advice on best route to get a "user friendly" less hassle - work like it should setup. Any help is appreciated.