I had a perfectly running system using a GTX 560 Ti on macOS Sierra 10.12.1 using Clover bootloader from a usb thumb drive with no additional settings, drivers or kernel extensions.
(thumb drive because I wanted to separate clean macOS install from bootloader)
After I replaced the old graphics card with a GTX 960 macOS started with a resolution of 1280 x 1024 and very slow UI animations.
Knowing that the 960 Ti isn't supported my macOS I installed the NVIDIA Web Driver.
(tried both ...f01 and ...f03 build)
I selected NVIDIA Web driver in the NVIDIA Driver Manager preference pane. After restart OS X the Default Graphics Driver is selected again in the pref pane and the resolution is still poor.
System Information says that my graphics card is 'Display 5 MB'.
What can I do to make the graphics card identified correctly and the NVIDIA Web Driver driver working.