Just today received a Sapphire Pulse RX 580 and replaced the GTX 1070 that I had in the machine. The 1070 was ok but was tired of the slower exports and having to wait for the new Nvidia webdrivers every time there is an update like this not to mention the extra issues of a major update like I'm sure there will be with the Mojave update. Took out the NvidiaGraphicsFixup.kext and the Lilu.kext and did not install the WhateverGreen.kext. Uninstalled the Nvidia driver and shutdown and installed the new RX580 card and my Hackintosh booted up without a hitch.
Perfect timing on getting the update notice for macOS High Sierra 10.13.6 right after installing the RX 580. I get to see how an update goes with the new card. Installed from the App Store and it installed without a hitch. Did the BruceX test in FCPX and went from the GTX 1070 export time of 29 seconds to 18 seconds with the RX 580. I do a lot of 2 hour or more event videos and this is really going to add up.
I think I'm going to be more then happy with the new video card.