If you're asking, I can give you hints (beware I translate menus from french)Originally Posted by Munsu
Nvidia Control Panel>Manage Personal(User) Resolutions
Then create
You have a popup asking for basic info and you have an Advanced option.
Then the popup unfolds and you can put the settings there.
Validate test and you should have the new mode available for the screen.
Should it not work -drivers are full of surprises...- PowerStrip is a more advanced solution that will also give you precise tuning. As it's more powerful, I'll let you find tutorials (eventhough it can be pretty straightforward)