I have a MP4,1 flashed to 5,1, dual 5680s, 64gb ram, 500gb 850 Evo on pcie sata III card, 1tb storage drive, usb 3.0 pcie card. Mojave. I removed my GTX Titan and installed a reference RX 580 to regain acceleration. The 580 shows up as a 480 and there are no drivers installed. Image is crap and only has options for two low resolutions. I placed the 580 in a PC and confirmed it was a 580 and working properly. reinstalled in MP and same issue. I am not sure what the issue is here, any suggestions? I am trying to avoid having to do a fresh OSX install. Would that actually fix this? Has anyone else heard or seen this problem? I was under the impression the card would just work. So frustrating, after this whole nvidia driver fiasco. Thank you in advance for any assistance.