[jolan]

The RX480 w/AMDGPU-PRO works pretty well in most cases for desktop/gaming/OpenCL use.

AMD's Linux team is in the middle of a big push to modernize the driver and software stack. It seems they consider it a mostly working preliminary version.

You can choose-your-own-adventure with the totally open amdgpu+mesa stack or use the proprietary AMDGPU-PRO. You can follow development of the open source parts on this mailing list:

https://lists.freedesktop.org/archives/amd-gfx/

I do agree with others that NVIDIA is a better choice if you want something that just works and you don't care about proprietary vs. open source.