This is a bit (or a lot) of a necro but a lot of people in here have said they've seen no noticeable improvement going to the 10x series of cards from nVidia in VR. This has been a very different experience for me. I have a 980Ti and performance in VR (i7 @ 4.2 ghz) was less than ideal. It was playable for sure but a lot of ghosting artifacts from low FPS on the Vive.
I'm running a 1080Ti now and it's smooth as butter, with no noticeable ghosting or stuttering, even in DCS 2.0. I'm also running 2.0 pixel density, although shadows are off as I haven't tried turning them back on after the upgrade.
Other than the video card my only change was an overclock from 4.2GHz to 4.3GHz, but such a small overclock couldn't have a huge impact.. perhaps a bit though. DCS does seem to be a CPU heavy game so some of you could maybe do well buying a cheap but effective water cooler (Corsair are nice) and boost your CPU a bit. I think they run for like $30-$40.