Thanks to help from several people, I'm up and flying. I think I know the answer to this, but you can confirm. RX 570 8gb. When in Prepar3d v5, I see 100% Gpu util and fans all maxed out, when flying. Probably need a new more powerful gpu. Is there any reason not to be flying at 100% until a new gpu is affordable? Thanks!
(gpu temps are fine, new thermo paste, and 3 new cooling fans, and passed the AMD gpu stess test)