Heya everyone, I'm seeing a 0.5 - 1 second periodic stutter occur when playing 60fps videos at 120hz/60hz, it happens at regular intervals. It occurs when a video is being played via youtube in any web browser (with and without video hardware acceleration) and it also occurs in software video players such as Vlc media player and Media player classic. The period between stutters changes depending whether or not Gsync is enabled in NVCP. The stutter is not baked into the video itself. Here is a video recording showing the issue, recorded using my phone. I'm using a stopwatch app to monitor the stutters (which happen roughly every 7 seconds). In the video you can see that the screen shakes horizontally every 7-8 seconds. In this example, the monitor is set to 60hz and Gsync is enabled. Monitor - Acer xb271hu (native 144hz). https://streamable.com/o0d85o Edit - Using a program called Rtss Blank status, I am able to see the refresh rate of the monitor whilst Gsync is enabled. There seems to be a correlation between the stuttering and the refresh rate changing. The intervals between stutters and intervals between refresh rate fluctuations seem to match. In the video below, notice how the refresh rate changes from 60hz to 59hz roughly every 7-8 seconds, which is the exact amount of time between the video stutters. Note : Rtss Blank Status application is not causing the stuttering. Watch this video and make of it what you will.. https://streamable.com/q4jv1j Got a couple of minutes spare? Please download this 60fps video (roughly 29MB), its the same video used in the example above ^, it's a popular youtube video - https://www.dropbox.com/s/wcryr0yqsq3p0d5/videoplaybacktest.webm?dl=0 Please do this quick test and get back to me, I appreciate it. If you have a Gsync monitor to test with, it's even better. - Set your monitors refresh rate to 60hz or 120hz - Vsync enabled/disabled, it doesn't matter - Open the video file in any app of your choice. Vlc/Media player classic/Films & tv etc.. - Can you confirm whether or not - - The video stutters once approx every 17-18 seconds if Gsync is disabled/you don't have a gsync monitor - The video stutters once approx every 7-8 seconds if Gsync is Enabled (You must have a Gsync compatible monitor and it needs to be enabled in the Nvidia control panel, fullscreen only) Things I have tried so far.. - I ran through the above steps on 3 different pc's, both intel and amd platforms, and could reproduce it on all 3. - Each pc has its own Nvidia Graphics Card installed (different Nvidia card in each.) - Each pc connected to a single monitor. - Tested two different monitors, a Gsync monitor and one non gsync monitor. - Tried both Displayport and Hdmi to rule out the port, I switched the cables over too. - I have so far tested 3 different versions of Windows 10, v20h2, v1909 and v1709 to rule out the OS version. - I have tested many different Nvidia drivers including Windows 10 default v432.00 to no avail - I tested without a graphics card installed, and used onboard only, and the periodic stutter does not occur. - I tested with and without Vsync enabled (forced via application profiles/globally.) - I tested using Vlc media player, Media player classic, Windows media player and films & tv (zune video) and also tried disabling hardware acceleration if the option was available. - I set NVCP global profile to prefer maximum performance. What I find really strange is testing without a Nvidia card installed, using intel onboard graphics, monitor set to 60hz/120hz, I did not see the same periodic stutter (every 7-8 seconds), it only seems to happen when using one of my Nvidia cards, hence why I'm asking here. :/ Edit - I asked a friend to see if they could reproduce it on their i7, 980ti rig with non Gsync 60hz monitor and they saw the exact same thing. When the monitor was set to its native 60hz refresh rate, they confirmed the 60fps video above ^ stuttered every 17-18 seconds in Vlc media player. Please do this test before commenting. Thanks a lot for your feedback.