No offence meant but I do not believe this!. have you actually checked your fps in stations and asteroid belts?.
PS you do know you are in the VR forum right? I assume you are not meaning 1920x1080 on a monitor which is a completely different beast to VR
I'm not obsessed with looking at FPS. I just go by what my brain tells me. I'm not going to fork out £300-£400 for a card upgrade just so I can see some numbers go up. The 760 works fine in the Rift, in stations and in Asteroids. It feels very smooth and lag free. I can dogfight and have an amazing overall gaming experience.
If you don't believe me I don't know what to say. Maybe your PC isn't as good as mine - its not always all about the video card.