Quote Originally Posted by TheFirstKel View Post
You cannot disable onboard graphics due to the integration-ness of Intel HD Graphics and nVidia Optimus.

You can use nVidia control panel to configure the application to use the appropriate GPU: http://www.howtogeek.com/136123/htg-...vidia-optimus/
It appears to be design specific. Some have figured out a way to disable it at the hardware or BIOS level. Intel HD is not even detected on my ASUS with an i7... only thing showing is nVidia.