To select a screen refresh rate

From the NVIDIA Control Panel navigation tree pane, under Display, click Change resolution to open the associated page.
If applicable, select the display for which you want to change the refresh rate.
From the Refresh rate list, click the refresh rate that you want to set.
For an analog display, the suggested setting is a minimum of 80 Hertz.
For a digital display, the suggested setting is a minimum of 75 Hertz.

Note: The refresh rate will be set automatically to the highest refresh rate for VRR-capable displays if VRR is enabled.