Runs just fine on my modest rig
i5 2500k (no clock atm)
8GB DDRIII 1600Mhz
GF 560GTX (non ti)
Even though i can't have everything maxed, it still looks just great even on medium settings, vsync off and locked to 58fps (cures input lag). And make sure you have the "maximum prerendered frames" in your graphics profiler turned to 1 for even less of input lag. Funny thing is, I can't run pCars on any acceptable visual settings without fps dropping below 58, can't drive a sim below that, sorry.
After some laps, I'd say this feels, looks and sounds (engine sounds cannot be judged by a 1.8 i4 engine) just great. Can't wait to take out the E30 around the Nordschleife now (even if the it doesn't come officially).