OBS is killing GPU usage in MSFS 2020, can't figure this out

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flyinion

New Member
Was trying to verify everything is working for a planned MSFS 2020 stream later tonight.....I regularly stream WoW with zero issues..........and I'm having some weird behavior with OBS that I can't figure out. Running the latest release on the latest version of Win10 Pro. Tried running OBS as admin and not. Basically I can be in the game with normal GPU usage of 70-90%+ and as soon as I fire up OBS but not start a stream or local recording GPU usage drops at least 10-15%. Then, once I start the recording, doesn't matter X264 or the new NVENC encoder (using a 2080 Super on a 3700X with 32GB of DDR4-3600) things get really weird. After a couple minutes, or less, GPU usage tanks. Like all of a sudden I'm using like 15-20% GPU and of course FPS tanks because of it. CPU usage never gets above 40's.

I run the sim at 3440x1440 and normal stream setup is a 2560x1440 canvas with the sim captured via game capture and sized into that canvas along with overlay elements and the canvas itself is set to output scale on the video tab to 1920x1080 and a CBR 3500 bitrate. However I have tried with my original setup as well from before I created overlays of a 3440x1440 canvas set to scale to 2580x1080 (I'm running an ultrawide monitor) and it only has the game capture and a webcam stuck in the bottom corner of the game and get the same behavior.

Sometimes the behavior will improve back to the slight loss if I stop the stream. Other times I just have to exit out of OBS altogether. As soon as I do, the sim starts behaving again.
 
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flyinion

New Member
Small extra note. I randomly tried shutting off preview, and that brought back the GPU usage from the low teens while I was testing recording/streaming. Weirdly I could then re-enable it and it didn't drop again. Forgot to mention I use a dual monitor setup. LG ultrawide and Asus regular 16:9. Both are 1440p and 144Hz.
 
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flyinion

New Member
And the preview thing doesn't seem to always work
carlmmii said:
Please post a log with your issue! Here's how...

Also, if you're not on windows 10 update 2004 or later, you will run into issues running multiple monitors at different refresh rates.
Click to expand...

Thanks, yes I'm on the latest fall update 20H1 or whatever they named it. However I think I finally figured it out. I was really confused because I've also streamed this sim in the past with no issues. Turns out it took a super high quality freeware addon to cause it. I was running the sim with "Texture Resolution" on Ultra and that combo with the addon seems to have been too much for my 8GB 2080 Super and causing it to choke. I tried multiple other things before such as turning off Hardware Accelerated GPU Scheduling etc. but once I lowered the texture resolution in the sim to High it's now running a stream test to Twitch with zero FPS or other issues. The utilization is still down but that must be a feature of HAGS as when I disabled it the GPU was running flat out at 99% all the time but still having issues after a few minutes of test streams.
 
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