Today i tested G960 MSI 4GB version in Yosemite i Hackingtosh - Z68 intel chipset board, with Nvidia last - f3 driver and its working. Im using Chimera, but other loaders should also work.
I had non MacOS related issue with this card, i had to upgrade bios to proper boot, before upgrade it took 2 minutes to boot loader.
OpenGL - Steam games and Unigine heaven benchmark are working.
Only issue i have is that only one monitor is on, second is dead, and i dont know how to turn it on.
Working monitor is connected on DVI, not working on HDMI, i other OSes works both. I need somewho force monitor detection.
Yes GC have also DP outputs but i hate DP, because of its behavior in Win OSes so i would like to make HDMI working..