To apply Coordinated Video Timing - Reduced Blanking (CVT-RB) settings to my display

From the NVIDIA Control Panel navigation tree pane, under Display, click Change resolution.
Click the image that represents the display you want to affect.
Click Customize, then from the Customize dialog box, click Create Custom Resolution.
(Quadro and NVS products only) In the Select displays section of the Create Custom Resolution dialog box, select any additional connected displays to which you want to apply the change.
Click the Timing Standard list arrow and select CVT reduced blank.

CVT reduced blank improves on the CVT standard. CVT-RB offers reduced horizontal and vertical blanking periods and allows a lower pixel clock rate and higher frame rates.
Click Test, then if the test passes and you want to save the new mode, click Save.