Never mind. I just noticed a GPU can't match a cpu on this algorithm.
Yes it can, but a lower end CPU.
300 H/s. That's the same speed as a newer mobile almost anything dual core. core i3 for example.
You need CUDA v 9.2 I believe. I used it on Linux and the
root@mac-mini:~# apt install nvidia-cuda-toolkit
was required.
Hashcat uses CUDA/OpenCL. The miner failed to start until I got hashcat to work.