I'm pretty sure the 520 is the gpu built into the processor. You won't get much out of it. All you can do is go into your bios and make sure it has as much memory dedicated to it as possible.
For those with Nvidia GTX 950-980M processors you still might have a problem if your laptop has the built in GPU turned on. Best bet, if your model of laptop will let you, turn off the integrated GPU and use the Nvidia for everything. In my case, I have no option to turn of the integrated GPU. I had to go into the Nvidia control panel and change it from auto to always use the GTX card for every program that supports it. I did that and now my 960m kicked in and the game looks nice and is playable. That dual video card for power saving thing does not always work as advertised.
http://www.geforce.com/hardware/technology/optimus/technology