I remember something like this from many years ago.
Do you notice the stutter if you look away from the screen and use your peripheral vision? I seem to recall that some people are more sensitive to it than others, and that it tended to disappear as scene complexity grew.
Also, are you sure your monitor is at 60hz? Many run at 59 *or* 60 (my Dell can be set to 29, 30, 59 or 60) - perhaps there is a hardware mismatch somewhere.