Secondary displays stuttering

[WhatsAComputer]

Monitors:
Main: 27" Samsung OLED 360hz
Secondary: 27" Acer LCD 144hz
Secondary: 42" LG C2 OLED 120hz

PC Specs:
AMD 7800x3d
3080 TI
64 Gb RAM

Context:
When playing multiplayer games use the 27" OLED as my main screen set to 360hz. I use the 42" monitor which sits above main monitor as a twitch, youtube, movie monitor while playing games. I then have the secondary 27" Acer monitor as a discord, browser, and oldschool runescape monitor. With my use case I almost play exclusively in borderless fullscreen when gaming.

When playing most games on the 27" OLED at 360hz my secondary monitors will have severe lagging/stuttering. I have tried disabling hardware/graphics acceleration on all apps, browsers, etc. I also tried using GSYNC but this doesnt appear to resolve the issue. I am also very sensitive to the flickering caused by GSYNC so I prefer it off. Within the NVIDIA control panel it also has options for 240 and 120hz. I tried 240hz and experienced the same issue. I tried 120hz and that appeared to resolve the issue. I obviously dont want to play at 120hz with this expensive monitor. Also, doesnt running monitors at a lower refresh rate than its native cause frame issues?

I am not knowledgeable at all when it comes to monitors. I usually make my decision based on reviews from RTINGS and youtubers since I do not have a good place to see monitors in person and wouldnt know what to test/look for. I was struggling to find info until I came across a video where they mentioned issues with multiple different framerates but didnt expand on it much. I figured this may a good place to get additional information.

Luckily, I am still able to return the monitor if this is something that cannot be resolved. If thats the case, do I need to stick with something around 170hz as a new monitor?

[WhatsAComputer]

I just tested 120hz again on the main monitor while playing Path of Exile 2 and my secondary monitors are still stuttering with a stream and Old School RuneScape. So maybe my theory of setting the main monitor to 120hz to be close to the refresh rate of the secondary monitors isnt the fix and was specific to one game.

[Dalek]

If you have multiple monitors at different refresh rates, then this is most likely the cause of why your other display(s) are stuttering. Benchmark tools, RGB software running in the background can also cause stutter.

Assuming that this is because of your monitors being at different refresh rates, there are a few solutions to this, but they're not ideal.

1. Keep one monitor plugged in, solely for gaming. Sticking to a single monitor setup with high refresh rates helps with getting rid of stuttering and other oddities.

2. Keep all monitors at the same refresh rate. This of course isn't ideal at all since all of your monitors max out at different refresh rates.

3. Plug the 144hz and/or 120hz monitor into your motherboard on board display as a workaround and see if that helps. You might not be able to push them to as high of a refresh rate since the on-board isn't as powerful (that being said you might be able to push it to 120hz or 144hz if you're lucky), but it should stop the stuttering.

Hope this helps.