Use Registry to modify 2K/XP default refresh rate _ registry

The modification method described below includes only edits to the Windows registry, so you do not need to run any third-party applications that are not of an unknown origin.

In theory, this modification will have nothing to do with the display driver/adapter because it modifies the display's setting value instead of the driver/adapter itself.

Important: Before modifying, make sure your monitor supports the refresh rate you want to use at the resolution! The consequences of conceit!

Assuming you have installed your monitor correctly (the display driver supports the vertical refresh rate you want, in this case 75Hz), and your "normal" system (no multi-monitor support is enabled, etc.), please do the following:

Open Registry Editor to find this key:
[Hkey_local_machine\\system\\curentcontrolset\\control\\class]. Expand the class key, and you will see a group of similar {1113e534-eaf87542 ...} The key.

If you select one of these, you will see a number of values, that is a string named "Default" or "Class", or both. They are used to identify the device, such as "Modem", "keyboard", and so on. Find the key for "Class" with the value "Monitor".

Expand the key, which should contain at least one subkey, usually "0000". If you have more than one subkey, you must see which one is currently in use, and then modify it individually.

Expand the "0000" key, which should contain the subkey "MODES" below, and then expand it, and you should see a subkey named after the maximum resolution of your display. Now, if you want to set a 1024x768 resolution of the vertical refresh rate of 75Hz, then you can add a subkey "1024,768" under the "MODES" key, adding 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 select the only refresh rate of 75Hz. Of course, the prerequisite is that the "0000" key is the key currently in use, and the "Hide mode not displayed by this monitor" option is selected. Repeat the above modification process to add all the refresh rate/resolution combinations you want to use.

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

Essentially, this modification is to set the minimum refresh rate that your monitor supports to the refresh rate you want to use. All games will now run at the specified refresh rate, regardless of whether they are using Direct3D or OpenGL.