What monitor are you using, what is its refresh rate and what cabling are you using? Is the monitor o/c'd? Are you using Vsync? Are you using a GPU O/S utility (Afterburner etc) and are you using some form of frame limiter? If so what do you have your FPS capped at?
Do you still get stuttering if you limit your FPS to 60FPS or below and turn Vsync off? Sorry for all the questions trying to get to the bottom of your problem:o