Just throwing this out there... But I've been having the same issue. New build with a 6800XT and an Intel i5 12400F. I've been trying everything suggested here and other posts but I can't seem to fix it. I just started plton the green server. Was on blue for about 7 years. Came back from a 5 month break.
I think the bad part about it all is that I built a new PC and chose to play P99 again
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First AMD video card and my laptop and older PC that I built for BF4 ran it fine.
It's just one of those things that you set your mind to and try to fix!