Same problem here. My specs are
Gigabyte Sniper x58 chipset
i7 930 running @ 4.2Ghz
2x gtx 580 sli
12GB 2000MHz DDR3 RAM
3TB +2TB + 1.5TB SATA ii 7200rpm HDD
1000W Corsair PSU
I have noticed that the game plays smoothly when the frame rate is at 60fps but noticed considerable stuttering when it dips to the low 40s. I have played many many other games at lower frame rates which appear much smoother than the stutter I am experiencing with this game, including need for speed the run, which initially when released had a cap of 30fps. Usually, an fps in the low 40s should appear silk smooth unless you have extraordinary eyesight which I dont think I have. The only other cause I can think of from the back of my head is that the same image is being refreshed multiple times. Usually, every time the monistor display is refreshed, a new image is displayed on the screen. However, in this game, I beileve the same image is being refreshed multiple times, hence the stutter at a relatively high framerate. Also, If vsync is internally enabled, for some reason, it is allowing the same frame to pass through and be displayed on the refreshed screen instead of waiting for a new frame to be generated. Otherwise there is no way I can get such stuttering at such a high framerate. I do hope they do fix it. Personally, i would not have released the pc version in such a state, but each to their own i guess.
l8r 🙂