Imac Radeon Pro 580x. No compatible GPU found I just bought a new iMac with Radeon Pro 580X GPU which supports OpenCL but neither Blender 2.8 nor 2.79 can, for some reason, utilise it with Cycles render engine. The program just says that "No compatible GPU found". I have read that others have managed to use Cycles with GPUs with their Macs so I have no clue what's wrong here. 

Can anyone try to help me out here?
I was facing the same problem in Linux. When you install your GPU drivers try to put the following additional options: --opencl=pal,legacy,rocm.

I found this answer here and it worked for me after two weeks with this problem.