Last week I began posting a number of AMD Radeon RX 580 Linux benchmarks but not covered so far has been the OpenCL compute performance considering the Clover-based compute stack isn't good enough for benchmarking and is basically unmaintained these days by AMD. Meanwhile, their ROCm stack is still being brought up and is not yet fully-opened nor optimized yet for performance. Thus for those with desktop cards looking for basic OpenCL support are left with the AMDGPU-PRO hybrid driver with its closed-source OpenCL driver. In this article are some fresh OpenCL benchmarks of AMDGPU-PRO on the RX 580 and other Radeon GPUs compared to NVIDIA with its Linux OpenCL driver.