My system:
Intel i7 4790K
8 GB DDR 3 RAM
GeForce GTX 760
The whole was under GeForce experience - very fluid Optimal quality with around 60 FPS, but I turn everything on high or ultra decreases the rate at ~ 40fps which results in a lower sense of speed. But as in any case a GeForce GTX 980 is planned, the end of the year running at maximum at the latest.
Graphic is anyway the best I've ever seen in a racing game, absolutely credible.
LG