A monitor driver, at least in the form most people remember dealing with on Win32 systems, wasn't even a piece of software. It was just a .INF file containing the Windows equivalent to X modelines describing what modes and was only necessary if you either didn't have working EDID for whatever reason or wanted to go outside the range the monitor advertised working at.
Before these "drivers" had to be signed it was common for various graphics tweak tools to provide a method for building your own custom INF to "overclock" a monitor that only officially supported 60 Hz or whatever.
Before these "drivers" had to be signed it was common for various graphics tweak tools to provide a method for building your own custom INF to "overclock" a monitor that only officially supported 60 Hz or whatever.