Today I added 2 gtx 1060s to my 2 gtx 1080 ti. Somehow the system got so slow and won't run properly.

With the original 2 gtx 1080 ti my system runs very smoothly.
With the 2 gtx 1060s, when  I typed "top" , All I see the CPU working on is nvidia-smi / and nvidia-settings.

http://take.ms/H5na0
Does the nvOC use a lot more resources when different NV cards are being used?

Here's my system config:

Mobo: MSI z270-SLI Plus
CPU: Celeron G3900
Ram: DDR4, 4GB
USB/HDD: 32GB USB thumb stick
GPUs: 2 x 1080 ti, 2 x 1060