Stutter caused by G-SYNC (video demonstration)

[maul]

I've been having microstutter in certain games for some time now, and G-SYNC seems to partially be the culprit.

Here's an example in Portal 2 by rotating the camera around - first example is no G-SYNC, second is with G-SYNC:

https://www.youtube.com/watch?v=qT-tMPI9OLQ

As you can see, the frametimes are entirely smooth at first, then when G-SYNC is turned on there is fairly consistent stutter based on moving the camera. It's more random when walking around.

Note that it doesn't matter whether it's windowed/full screen, the result is the same. I just disabled it for windowed to make this video easier. Also, capping the framerate to a few frames below actually seems to make the stutters even more noticeable.

Using a 10900k/4090, Windows 10. What is the deal?

[jorimt]

1) frametime variances don't always = visible stutter, and 2) what you're seeing in this particular instance may be caused by reporting differences on the RTSS-side between the two scenarios, not G-SYNC.

Also to be clear right off, G-SYNC does not prevent system-side stutter, only sync stutter.

We'd need more details to determine anything in this particular instance; your complete system specs, key OS settings, NVCP settings, in-game settings, etc.

I have Portal 2 as well. What map were you on in the video, and what are you capping the framerate with (when you are capping it)? RTSS, Nvidia MFR, in-game?