I don't know if those are Amd, framework or Linux issues and who is to blame. The cpu is very new so there might be more driver issues than normal. Hopefully these issues get resolved with future updates. The first firmware update didn't help my issues.
Most of the time the noise is negligible, but with dark screens and resource intensive tasks it gets more noticeable and pronounced. But it's better than the screen tearing other users experience.
I'm wishing you luck that most of the issues are resolved when they ship the framework 16. I'm very tempted to get that one as well, just for a custom ortho keyboard if they ever make one...
Those are my personal experiences, they might not be representative for all users, but those are my issues. I don't work for framework amd can't give you updates regarding support issues.