[ndarwincorn]

Those are pretty old cards though (I've had amdgpu support for my six year old 7970 since kernel 4.9, and I think they've extended it back to a generation or two older architectures now), and you can use the open source radeon drivers with any kernel.

I think the folks using Catalyst for better 3D acceleration have probably moved on to cards supported by amdgpu by now.