Possible to prevent X11 from using Nvidia's resources with hybrid (2) GPU setup?

I have an integrated Intel card and an Nvidia card. I’d like to be able to use 100% of the Nvidia card’s resources for CUDA, but Ubuntu/Nvidia-Optimus automatically direct the Nvidia’s card resources to X11. I’ve tried modifying the xorg.conf file in a few different ways, including changing the accelmethod option, with no success.

Does anyone have any ideas? I know the Intel card can handle the display/X11 because I can turn off the Nvidia card, but I haven’t found a way to free the Nvidia card from X11 without turning it off.