Hi TommyJon,
I am not with Laminar Research or any links with the company mentioned below; just a flight simmer.
Have a look at the following link found at https://www.x-plane.com/kb/x-plane-11-system-requirements/
Most flight simmers, particularly the serious flight simmers, build or have a system that is equal to or of greater specifications than the recommended system requirements. X-plane 11 is resource hungry with reliance on good graphics (GPU), good CPU speed and good memory (RAM). Because X-Plane, particularly version 11, generates heat you also need to have good internal cooling. If not then your system will most likely crash.
Personally I think your system is aged and the weakest link is the graphics card. Memory (RAM) should also be considered as an upgrade requirement
Have a look at the following YouTube videos from Michael Brown. They may be of some benefit or help with your dilemma. He company builds flight simulation PCs predominantly for X-Plane. His company is recommended by Laminar Research as the PC supplier within the USA.
The two links can be found at https://www.youtube.com/watch?v=j_YQMSeNM-M from about 3 min 30 secs and https://www.youtube.com/watch?v=kQr4uuRJKiU
I hope this helps. Good luck
Glenn