I've got a 1080 and have played around with a lot of debug and in-game SS settings, as well as GFX quality settings. There are too many variables to list, but I've found you can greatly increase the image quality of the cockpit interior, text, other ships, stations, & stars, but at the sacrifice of FPS. I can maintain 90FPS most of the time, but I take a severe FPS hit in a RES while in combat (not when just flying around asteroids). The odd thing is, it doesn't really seem that noticeable when the FPS drops and it doesn't bother me at all. An FPS drop in the SRV is more of a problem (for my eyes and my stomach), so I tend to pick settings that are a little lower so I can maintain a decent FPS in the SRV - but still not 90FPS. I also start at High GFX quality and turn a few things down. Still, it is a vast improvement over Ultra at 1.0 in-game SS with no debug tool.
So IMHO, even a GTX 1080 does not have enough grunt to get the most out of VR, but I gotta imagine it is a lot better the 9xx series cards.