dave@Mobius:~$ dpkg -l | grep nvidia
ii  nvidia-331                                           331.113-0ubuntu0.1                       amd64        NVIDIA binary driver - version 331.113
ii  nvidia-331-uvm                                       331.113-0ubuntu0.1                       amd64        NVIDIA Unified Memory kernel module
ii  nvidia-opencl-icd-331                                331.113-0ubuntu0.1                       amd64        NVIDIA OpenCL ICD
ii  nvidia-prime                                         0.6.7                                    amd64        Tools to enable NVIDIA's Prime
ii  nvidia-settings                                      331.20-0ubuntu8                          amd64        Tool for configuring the NVIDIA graphics driver
dave@Mobius:~$