Have you disabled Windows Aero? Aero forces some kind of vsync to the desktop, and instead of some tearing, you get some stutter. Disable it and try again.
CPU: Intel Core i5 4670k @ 4.4GHz
GPU: GAINWARD GeForce GTX 1080 Phoenix "GLH"
RAM: G.SKILL Ripjaws X DDR3 16GB 1600MHz CL7
OS: Windows 7 Ultimate x64
GPU: GAINWARD GeForce GTX 1080 Phoenix "GLH"
RAM: G.SKILL Ripjaws X DDR3 16GB 1600MHz CL7
OS: Windows 7 Ultimate x64
