Try go through your monitor settings on your actual monitor and see anything on their for response rates / resolutions etc, also check the NVIDIA control panel and try that, if not consult to emailing your monitor company.
** UPDATE **
CONTROL PANEL SOLOUTION
Go to your desktop screen, right click anywhere and click control panel, then click advanced settings, then click monitor and you should see screen refresh rate and it may say something along the lines of 60 Hertz, click on it and see if you can increase that.
NVIDIA CONTROL PANEL SOLUTION
Go to desktop, right click anywhere then click on NVIDIA Control panel, then click change resoloution then click refresh rate on the right hand side and try increase to 144Hz