Lenovo Y700 graphics card?

So recently, I purchased a Lenovo Y700. Everything is great, however it defaults to using the integrated graphics instead of the Nvidia GTX960. I can bypass this by disabling the integrated graphics in the device manager, but this causes much less performance than I should be getting. For a short time today, my laptop was using the GTX960 with the integrated graphics still enabled, and the performance was excellent, but it soon went back to using the integrated only. I'm not sure what caused it to work and then stop. Does anybody know how to tell the laptop to use the graphics card without disabling the integrated graphics?