Question / Help OBS preview and source projector stuttering


New Member
So I am trying to stream 1080p 60fps. I have a dual PC setup, and am using an acer x34P 120hz 3440x1440 monitor and an elgato 4k60 pro capture card.

Im having one of two issues:


If I clone the display and capture card, setting them both to 3440x1440 100hz, then the stream is "smooth" but has pretty awful tearing. Using vsync fixes this mostly, but ends up with a single, slow tear moving down the screen every now and then.

If I use this method:

Then the stream is smooth most of the time, BUT, when the gpu is under heavy load, the obs preview and source projector will stutter/reduce the apparent framerate. Which then shows on stream.

You can see this here:
At first its fine and smooth, then at about 1:28 when I enter the town the game capture starts stuttering.

This is NOT an encoding issue, there are no dropped frames on my encoding rig, and I can see the preview stuttering on the 2nd monitor of my gaming rig.
Setting OBS process priority to "realtime" doesn't help.
I've also tried disabling preview and just using the right click -> source projector

Is there anything I can do to make the OBS preview/game capture stay smooth?


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