Agree with @HamiltonFred here, stop chasing FPS and set the sim up to a level that you enjoy else you may as well be playing PC Building Simulator.
Having said that, I appreciate some people enjoy this aspect of the hobby, pushing and tweaking the hardware, and I just purchased a new PC for FlightSim (my last was approaching 10 years old) but even now I don’t chase the FPS, as a matter of fact I haven’t even bothered checking it, but it looks great and feels great how I have it setup at the moment and not everything is cranked up.