I realize that x-Plane just about needs a super computer to run well. When I said I changed my video card from AMD to a GTX 680. I think I now remember the AMD video card I swapped it from. It was a RX 470. I was running X-Plane 10. The FPS with same settings I had before were hardly any better than my previous card which was A AMD HD 7970. With the GTX 680 it went much better. I was using these GPU’s with a i7 4770k CPU, at about end of 2014 and beginning 2015 when X-Plane 10 was the latest version. Flight simulators tend to be very demanding on computer resources not just X-Plane. There is a user provided benchmarks from the built in benchmark feature of X-Plane that compares hardware:
https://docs.google.com/spreadsheets/d/15rNa7_naUM8a4YzzrzwrxvWSl4X8SHesshZGm7H54AI/pubhtml#