So I've just set up a new rig with Windows 10 64-bit and running NVIDIA GTX 1070s. I'm getting 2.5MH/s. I am sure I have seen something like this before but I can't remember how it was resolved.
I've updated Windows, and I am running the recommended driver (I think 368.81).
Any idea how to resolve this?
EDIT: I'm reading how this could be fixed by downloading the Windows 10 Creators update. Not sure what that is but I'll try in the morning.