I recently purchased a Zowie XL2411P 24in. monitor with a 144hz refresh rate. I was trying to make custom resolutions for gaming (specifically 1440x1080), and whenever I tried to change the refresh rate in the custom resolution settings from 60 to 144 it would tell me that the monitor doesn't support the settings. Below are screenshots of the settings I have been trying to achieve, (The same settings as my previous 1440x1080 resolution on a 60 hz monitor, barring the Refresh Rate and G.Refresh Rate), and the error message.
Any help is appreciated!
Try changing resolution in amd to 1440x1080 and the refresh rate to 60 and than change it in right click on desctop >display settings>advanced display settings>display adapter properties for display 1>monitor>switch to 144hz(for windows 10 it worked for me).