Well, i just upgraded from 970 to 1070 to improve image quality on my vive using super sampling, i tested raw data, i set SS to 1.4, and all graphics options at medium and it still lags as hell on some scenarios, is that game really demanding?, because it does not look like it requires such a monster PC to run properly.
I tried RD on a 1080 at the MS store. I have a 970 and to get RD to run smooth on it I have to make it fairly pixelated. The 1080 demo I tried was smooth, but res improvement was marginal at best. I was all in on getting a 1080 this holiday for the exact same reasons, to get some supersampling, but hardware is just not there yet. When a card comes out that can run Project Cars at 4k 90 fps, i will upgrade then.