The graphics card is powerful, but I suppose it isn't design to run on a constant basis because it is designed for a laptop. Apparently, Nvidia is not very well supporting this card under Linux. You can get the drivers to install it from this location:
http://bumblebee-project.org/install.html
https://github.com/Bumblebee-Project/Bumblebee/wiki/Install-and-usage
After installing you run 3D on a per-program basis. As an example, to run glxgears with the card, type:
optirun glxgears
To run nvidia-settings: optirun nvidia-settings -c :8
On my system, glxgears runs at about 50fps with the default Intel graphics, and at about 450fps with Nvidia graphics. So it's a pretty excellent increase.
PRO: Good graphics power.
CON: A little bit tricky to setup and run your programs with.
More information
http://bumblebee-project.org/index.html
https://github.com/Bumblebee-Project/Bumblebee/wiki/Troubleshooting
