Oculus + Gtx 970 SLI + VR preview = PC crashing


I have some serious issues working with Oculus DK2 and my new GTX 970 SLI.

I heard that UE4 is not dealing well with SLI but in editor I can see big boost of FPS. However, after clicking “VR preview”, my whole PC is going black and the only way to fix it is to restart my PC.
In a normal (not VR) game mode, everything is fine.

Could please anyone tell me what causes this problem and how to solve this? I need my second GPU only for working in Unreal, without it is useless for me :frowning: