It was plug and play for about three days (Add Y splitter for power and display port cable from 5080 to Monitor). Not sure why but today the system is really unstable. Only thing I changed was adding some new RAM so I need to take that out and see if any improvement.
Just really strange since last night I was getting sudden drops in the IJ full circle to 5 fps then back to 50+ which did not happen Saturday (the day I added more RAM). Now the game refuses to launch properly and runs at 5 fps the entire time and me messing with the settings with a choppy mouse hasn't helped.
I read that the best way to unlock the full potential of the AGA is to manually disable the internal/laptop gfx discrete (somehow in BIOS such that they do not show in OS) such that the system only looks to the AGA card. I haven't discovered those steps but perhaps I am getting unlucky BIOS enumeration which is giving the 5080 trouble w the OS? Sometimes if I have the other cards disabled in the device manager then strange things happen. One being the internal LCD does not cleanly hand-off during boot and stuck with logo when the 5080 monitor takes over. (not always though)