For CUDA you need at least CUDA 9.0 RC driver! Thats first driver can handle
pascal gpus.
Its only available by dev download and its only to have complete with dev sdk = 1,3 GB DL at CUDA dev zone.
But i can say its runs well on Sierra
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I am very happy with my Gigabyte GT 1030!
Its so fast compared to my not slow GTX 650 (in CUDA / OpenCL up to 4 times faster, Metal up to 2 times) before - and takes so less power.
No sleep problem, some other have. I would recommend to compare the company of those GT 1030 have slepp/wake up problems. Perhaps they all (i think rare!) have same sleep/wake problem -maybe their BIOS of GPU isnt good for OS X. In the past some BIOS of GPUs made problems...