GTX 970 high power draw at idle with multiple monitors enabled

Graphics / Linux Linux
1

I noticed that my GTX 970 draws ~50W at idle whenever I have dual-monitor setup (3840 x 1200). Whenever I use xrandr to disable one of them, power usage drops significantly.

Is this expected behavior?

Note that it consumes ~50W even in clean WM (awesome WM, no OGL or anything like that running).

[Album] imgur.com 
tomas@tpnb ~ % xrandr
Screen 0: minimum 8 x 8, current 3840 x 1200, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected primary 1920x1080+1920+0 (normal left inverted right x axis y axis) 531mm x 298mm
   1920x1080     60.00 + 144.00*  119.98    99.93  
   1440x900     119.85  
   1280x1024    119.96    75.02    60.02  
   1024x768     119.99    75.03    60.00  
   800x600      119.97    75.00    60.32  
   640x480      120.01    75.00    59.94  
HDMI-0 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 546mm x 352mm
   1920x1200     59.95*+
   1920x1080     60.00  
   1680x1050     59.95  
   1600x1200     60.00  
   1440x900      59.89  
   1280x1024     60.02  
   1280x960      60.00  
   1024x768      60.00  
   800x600       60.32  
   640x480       59.94  
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)

Sun Dec 11 18:16:03 2016       
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 375.20                 Driver Version: 375.20                    |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce GTX 970     Off  | 0000:01:00.0      On |                  N/A |
| 33%   62C    P0    43W / 158W |    158MiB /  4059MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+
                                                                               
+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID  Type  Process name                               Usage      |
|=============================================================================|
|    0       365    G   X                                              115MiB |
|    0     23049    G   ...omas/.local/share/Steam/ubuntu12_32/steam    12MiB |
|    0     25841    G   firefox                                         29MiB |
+-----------------------------------------------------------------------------+

Please lemme know if bug report script output is needed and I will provide it.