GTXJackBauer

If your GPU is stuttering like it was with your previous GPU, it could be something wrong with your PC's hardware and or software side.
 
Check your task manager and see if there's any load on the GPU while idle.

You didn't get the point, the stuttering has nothing to do with the GPU or Nvidia and I didn't really want to discuss the stuttering part here as it is distracting from the main topic.

It is a known problem of Microsoft DWM for ages.
Whenever you have multiple monitors that are running with refresh rates that are not integer multiplies of each other, the secondary display will stutter.

DWM is doing all the rendering stuff at 144 Hz of your primary display and forcing Vsync. If the secondary display is running at 72 Hz, all it needs to do is display just every second frame on it - > FINE.

At 60 Hz, it needs to display every 2.4th frame, which is not possible so it will have to skip frames - > stuttering.

At the moment it is technically impossible to have a 144/60 setup run without stuttering on one of two screens on windows desktop, because DWM can NOT render the desktop independently for both screens. It wants to be in Vsync for both displays simultaneously, which is only possible for setups like 120/60, 144/72.
If I connect my laptop (Intel GPU, 60Hz) to a 144 Hz monitor and extend the desktop, it's completely the same thing.


I already wrote in my main post, if I have it at 144/72, all stutter is completely gone! It's just a problem of the 2080 not running at idle clocks then, while the 970 was.