I have been searching for enabling CUDA rendering for Blender Cycles for several days, finally I found the solution.
- you need nVidia latest driver for your specific MacOS version
- you need latest CUDA driver for your MacOS
In fact nVidia released new driver for every version for the MacOS, but I don’t know why you can’t search it on its website.
you just can search on Google, for keyword like :
nvidia quadro & geforce macos driver release 10.13.6
The 10.13.6 is your specific MacOS version, it must match yours
Then click link https://www.nvidia.com/download/driverResults.aspx/136062/en-us to go to download page
Then you go to CUDA site to download latest CUDA driver for your mac.