how to use blender display on my monitor 4k and enable CUDA on my MacOS preferences - system? I just downloaded the latest blander- 2.92.0 on my MacOS, and the render time was extremely long , so I bought a monitor LG ultra fine that comes with precision 3240 and Nvidia.
if you want to use CUDA cores, you need to have an Nvidia Graphics card. If your mac has an AMD graphics card, use OpenCL in the preferences rather than CUDA. As far as I know, you cannot render on your monitor, monitor is just used to display the image that your computer outputted. Check your Mac specs, what graphics card does it have?