Hmm,
Try setting
Vertical sync to "Adaptive" in the NVIDIA Control Panel "Managed 3D settings" menu and also change the setting in
power management mode from "Adaptive" to "Prefer maximum performance."
Run a game and report your results.
You could even try restoring your current power profile (high performance) back to defaults.
Run a game and report your results.
If those settings didn't fix your stuttering problem, please do the following test for GPU load spikes. I would suggest running an offline game for this test so as to not confuse high latency issues with load spiking.
Run GPU-Z (
http://www.techpowerup.com/downloads/SysInfo/GPU-Z/) and go to "Sensors" tab and check the box "Log to file" and save it to your desktop. Now run a game where stuttering is more frequent and play for a few minutes until you feel you gathered enough spikes. Next, ALT + F4 out of your game and close GPU-Z. Now open the log file with "Notepad" and locate on the top "GPU Load [%]." In that column scan through the numbers, you are looking for fluctuations (with consistency) of high (being 99) to low (below 90's) numbers.
In most current games the GPU load is usually steady around 98% or 99% but can drop to mid 90's depending on areas in game. You should have similar findings.
Report what you see in your log and if those settings above changed anything for you.