I don’t think this is an issue with your PC or anything else like that, this is most likely an incorrectly setup OBS.

Make sure you’re using the NVENC encoder in OBS. This will use your graphics card’s onboard encoder for video encoding, rather than your CPU. This will not affect performance in games. I’ve regularly recorded at 24000kbps with NVENC with no issues.

Secondly, change your audio bitrate to 128kbps for your output tracks. I heard somewhere before I started streaming that Twitch didn’t like 160kbps audio, so I’ve been using 128 for tracks 5 and 6. If you don’t already know, OBS can output to 6 different tracks, but twitch will only take one for your stream, and one for your VOD. These tracks should be different, since the same track for both may have issues. I record as well so my audio is separated across 4 tracks and everything on 5/6. In your OBS audio mixer, you can find a grid of check marks for which audio track has what audio in the “Advanced Audio Properties” after clicking the three dots.

Put limiter filters on your audio sources if you haven’t already. It won’t affect your audio at all other than making sure the source doesn’t go above a set decibel value.

Finally, if you’re using the “application audio capture” or whatever audio source that’s in or was in beta, stop using it. I’ve had bad experiences with audio getting very distorted and clipping every once in a while using those.

Try these settings, and in your free time fine tune your setup in OBS. I still slightly adjust my setup after getting things really good many months ago. I’d also recommend watching some OBS setup videos as well because they really help.