game performance with i5 6600k and gtx 1070

[Alex]

Is your monitor plugged into the motherboard instead of the GPU? If it is, then you're running off your processor's internal GPU instead of your 1070.

If it's not that, then maybe this is relevant?

I found that there are intel technologies in the BIOS called VT-d (some sort of "GPU passthrough") and HPET (High Precision Timer). These should theoritically improve overall performance working with Windows 10, but for some reason they limit GPU usage in certain applications, such as Witcher 3 and DOOM!
Having disabled them, now I get 60+ FPS in witcher, 90-99% gpu usage, and 70-150 fps in doom, at 95-99% usage.

https://linustechtips.com/main/topic...and-cpu-usage/