9yes, those values can't be set by hand, even on a crt anymore, what you set is the refresh rate, from 50hz(really bad and old) to 120hz(very big and expensive high quality crt at specific resolution)
on lcd screens you can set it to work at 50, 60 and 75hz but honestly i never found any difference between those 3, everything looks the same, 60 is the default value
sometimes there is just 60 and 75 or just 60 so use 60hz and set it to the right resolution, the native one for that screen you have