with your Mac, since it has a Nvidia GPU, and Nvidia has abandoned Mac OsX, you must install a frash copy of High Sierra, even on an external hdd:https://itunes.apple.com/us/app/macos-h ... 4741?mt=12
with CUDA 410.130:https://www.nvidia.com/object/macosx-cu ... river.html
upgrade to 10.13.6, installing also all the Apple Security Updates (several boots), and finally install the latest GPU drivers:https://www.nvidia.com/download/driverR ... 9341/en-us
Please, make sure to have disabled the **Synchronize on geo update** option, in Octane Settings / Others,. If enabled can cause instability issues under OsX:
And enable the Out-of-Core option too, since your GPU is quite old, and does not have too much VRAM memory (1GB), and power.
GTX 755M performs only ~14 in Octanebench, while we suggest a minimum of ~45 for a smooth experience:https://render.otoy.com/octanebench/sum ... x+GT+755M+