AMDGPU-PRO vs. NVIDIA OpenCL Performance With ArrayFire Using 18 GPUs
In a few tests, the AMDGPU-PRO driver even reported to do better than NVIDIA.
Though some of the ArrayFire tests seem rather sensitive and appear to have issues of some sort, such as when the GTX 1080 loses out to older NVIDIA cards.
So once diving deeper into the results, there are at least cases where the AMDGPU-PRO OpenCL stack is doing very well.