alberto@Alberto:~$ dpkg -l | grep nvidia
ii  bumblebee-nvidia                                      3.2.1-5                                             amd64        NVIDIA Optimus support using the proprietary NVIDIA driver
ii  nvidia-331-updates                                    331.113-0ubuntu0.0.4                                amd64        NVIDIA binary driver - version 331.113
ii  nvidia-331-updates-dev                                331.113-0ubuntu0.0.4                                amd64        NVIDIA binary Xorg driver development files
ii  nvidia-331-updates-uvm                                331.113-0ubuntu0.0.4                                amd64        NVIDIA Unified Memory kernel module
ii  nvidia-libopencl1-331-updates                         331.113-0ubuntu0.0.4                                amd64        NVIDIA OpenCL Driver and ICD Loader library
ii  nvidia-opencl-icd-331-updates                         331.113-0ubuntu0.0.4                                amd64        NVIDIA OpenCL ICD
ii  nvidia-settings                                       331.20-0ubuntu8                                     amd64        Tool for configuring the NVIDIA graphics driver