My IPS monitor supports a 75Hz refresh rate under Windows and I’ve no idea how to enable it under Linux.
In Linux nvidia-settings offers refresh rates only from interlaced 50Hz to 60Hz.
In Windows I just run NVIDIA control panel, click “Add a custom refresh rate”, specify 75Hz, hit apply and everything just works. Not so much in Linux.
I tried entering my monitor HorizSync and VertRefresh values into nvidia.conf but that didn’t help.