Thanks Jaf. I just did that with the newest driver 391.35. I have an Aten switch with a connector (blue, digital I guess), if that's what you mean.
I'll try this out for a while, and if I encounter problems go back to driver 378.66.
But what would you guys recommend as settings for 3D and such in the Nvidia control panel? Lots of stuff that can be changed. For me only TG and software like PS, Lightwave, ZBrush... no games.