I have to tell you that one invaluable lesson I learned from a Windows guru (NickN from simforums.com) was that Microsoft Flight Simulator is more heavily dependent upon CPU usage than GPU. That is because the calculations a processor has to make in order to accurately simulate flight.
All that to say, when I decided to delve into MSFS 2020, I decided to invest heavily in CPU. Quite consistently, I average in high 40’s and high 50’s in frame rates. No exaggeration here. Even over Manhatten I remain around 40. And yes, scenery settings are set to ultra
All that with a “measly” GTX 2070 Super. And with an i9 10900 CPU. And that’s the one that doesn’t overclock. I added 2tb SSD because data space and speed matters with flight simulation. I have flown every Microsoft Flight Simulator since Windows 95, and was sick and tired of trying to squeeze every precious frame out of my pc. This combination has proven to be my silver bullet so far. Now—I am not trying to do this on a 4k monitor, but I am using a gaming monitor. After all these years, I’m one happy boy with my flight sim!