Modify the 2k/XP default refresh rate with the registry

The modification method described below only includes editing of the Windows registry, so there is no need to run any third-party applications of unknown origin.

In theory, this modification method will be independent of the display driver/adapter because it modifies the display's settings, not the display driver/adapter itself.

Important: Before making changes, please make sure your monitor supports the refresh rate at the resolution you wish to use! The consequences are at your own risk!

Suppose you have installed your monitor correctly (the display driver supports the vertical refresh rate you want, in this case 75Hz), and your "normal" system (not enabled) Multi-monitor support, etc., please do as follows:

Open the Registry Editor and look for this key:
[HKEY_LOCAL_MacHINE\\\\system\\\\CurentControlSet\\\\Control\\\\Class]. Expand the Class key and you will see a set of keys similar to {1113E534-EAF87542.....}.

If you select one of them, you will see some values, which are a string named "Default" or "Class", or both. They are used to identify devices like "modems", "keyboards" and more. Look for the key for the "Class" value of "Monitor".

Expand the key, which should contain at least one subkey, usually "0000". If you have multiple subkeys, you must look at which one is currently in use and then modify them one by one.

Expand the "0000" key, which should contain the subkey "MODES" below, then expand it, then you should see a subkey named after the maximum resolution of your monitor. Now, if you want to set the vertical refresh rate to 75Hz at 1024X768 resolution, add a subkey "1024,768" under the "MODES" button and add the string value "Mode1"="75-75,75- 75”.

Now if you open the "Display Properties" (right click on your desktop), click on the "Advanced" button and go to the "Monitor" tab, you will be able to choose a unique refresh rate of 75Hz. Of course, the precondition is that the "0000" key is the one currently in use, and the "Hide the mode that the display cannot display" option has been selected. Repeat the above modification process to add all the refresh rate/resolution combinations you want to use.

Finally, go to "Display Properties -> Advanced -> Monitor" and select the refresh rate, here select 75Hz.

Essentially, this modification is to set the minimum refresh rate supported by your monitor to the refresh rate you wish to use. Now all games will run at the specified refresh rate, regardless of whether they are using Direct3D or OpenGL.