nvidia-smi
Wed May  3 10:25:41 2017
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 375.39                 Driver Version: 375.39                    |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  Quadro K620         Off  | 0000:03:00.0      On |                  N/A |
| 34%   43C    P8     1W /  30W |    201MiB /  1991MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+
|   1  GeForce GTX 1070    Off  | 0000:04:00.0     Off |                  N/A |
|  0%   45C    P8     8W / 151W |      1MiB /  8114MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID  Type  Process name                               Usage      |
|=============================================================================|
|    0      1146    G   /usr/lib/xorg/Xorg                             156MiB |
|    0      2634    G   compiz                                          43MiB |
+-----------------------------------------------------------------------------+