Sometimes I need to change the Video Refresh Frequency but I only have a Remote Desktop connection to the server.
So I searched a lot into registry and found the correct key:
HKEY_LOCAL_MACHINE\ SYSTEM\ CurrentControlSet\ Hardware Profiles\ Current\ System\ CurrentControlSet\ Control\ VIDEO\ {classid}\ 0000\ DefaultSettings.VRefresh
The value is stored as a REG_DWORD in hexidecimal form, so if you want to use a 60Hz Frequency, you must set 3C as value.
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