Nvidia Multi-GPU technology (Quadro K2000 and Geforce GTX660)

I want to know good information or some advices from experienced people about “Nvidia Multi-GPU technology”.
My machine is HP Z400 (6 dimm slots).
I am using Nvidia Quadro K2000 on Z400 as a graphic card.  
Additionally I own another graphic card Gigabyte GV-N660OC-2GD (NVIDIA GeForce GTX 660 GPU).
If possible, I would like to try these two graphic cards by “multi-gpu”.
Any suggestions are welcome!



Nvidia explains something for HP workstation users like this - “Where to buy multi-GPU (Certified Multi-GPU Technology OEM Systems)” (http://www.nvidia.com/object/multi-gpu-technology.html)

In Japanese Nvidia website provide information of three HP machines.
Here:
http://www.nvidia.co.jp/object/buy-multi-gpu-technology-jp.html
Click left “HP” and you can see three:
HP Z420, HP Z620 and HP Z820

(When I checked English site of theirs, I can not find anything on “HP”.)
http://www.nvidia.com/object/buy-multi-gpu-technology.html



Thank you!
2017-08-20