I mentioned the nvidia because it's showing up with the highest dpc in your image. Mine runs about half that, which is still higher than I'd like. When I disable it in device manager I can get it down around 100.
Dedicated GPU is 99.999% not necessary for audio work. Unless of course your motherboard has no video ports.
I take it you're still having issues?
Another thing you can try is to ensure Reaper is the only thing using the audio device. If you right click the speaker icon on your taskbar and go to sound devices, you can set Windows to default to the motherboard audio. Fully disabling ;there any unused audio like hdmi can help as well.
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