Operating system: Mac OSX Catalina 10.15.1
Graphics card: AMD Radeon RX 5700 XT
Short description of error
Plugged in an external GPU the Razer Core X to my 2017 iMac. The Mac operating system recognizes the EGPU and is displaying correctly, but in Blender system preferences it is not recognized as a rendering device with CUDA or Open GL.
Exact steps for others to reproduce the error
Buy Razer Core X and AMD Radeon RX 5700 XT and use in Blender 2.8 on Mac OSX Catalina.