Sapphire Radeon 7950 Mac Edition on MaPro 5,1 macOs Sierra

I moved my Sapphire Radeon to my MacPro 5,1 over a year ago and everything has been fine. I have no glitch and things are smooth. I wish I could upgrade to a Sapphire RX580 8GB and get more power with FCPX, Premiere, Resolve, Motion and After Effects - my staple apps.

Apple has announced some support for external GPUs in masOc High Sierra, and the Radeon 580X is one of the few card that seem to be supported. Although as a single GPU in a MacPro we probably wouldn't see the splash screen at startup. The card is hard to come by though. I am still on Sierra, and I might wait until the end of the year to upgrade os + GPU. We'll see.

The card has seen a lot of usage, and has been working flawlessly, so I'm not complaining. I read on the internet that the 7950 glitches happened in a single monitor configuration. Might be why I have been immune on my station since I am using two monitors. My previous post about this problem was back in 2014 in a MacPro 3,1: https://humanuser.blogspot.com/2014/02/radeon-7950-mac-edition-on-macpro-31.html