AMD put out a new driver 21.1.1 and while it did not resolve the issue it did change the HWinfo64 results.
Each run was done running around killing things in Tangled Shore after patch 3.0.2:
21.1.1 Shader Cache Off + DXcache cleared
https://imgur.com/gallery/02NMk9q
21.1.1 Shader Cache On
https://imgur.com/gallery/A1Bw0gK
21.1.1 Shader Cache On + Multi Threaded Render 1 CVAR edit.
https://imgur.com/gallery/WB2J1WM
DXDIAG:
https://pastebin.com/GikH1Q9n
As you can see Shader Cache Off does not seem to help, however editing cvar does.
However keep in mind the cvar edit is unusable as a fix as there are horrible flickering textures.
There are [b]no issues[/b] when I swap only the GPU to an Nvidia 1080, same system (POST 3.0.2)
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i upgraded from a 1080 as well and was so disappointed to receive much worse performance out of my new card lol ugh