Ok, took more work than I thought to get the 4650G Pro installed, had to drain parts of the loop to access the cpu socket.
Typical I dropped the 3800X and bent some pins on it, it fell out of the socket as I unlatched it still standing vertical. Had to rework them a little.
Well the 4650G takes quite a few boot loops to start up, thought it wasn't working at first. Had to wait more time than ever for it to post.
Went through a few BIOS q-flashes thinking it wasn't compatible, just wasn't patient enough to wait the required loops to post.
But it's running now, just enabled XMP to check the basics everything is working as it should.
(There was a issue with the POST getting stuck on code [97] if I used some settings. I'm unsure exactly the root setting but stock/defaults was causing it with CSM:disabled.
Leaving CSM:enabled and disabling iGPU I no longer had the issue.) [F31n]
[F31o] did not cause this issue as far I've seen.