This video is not about msfs but may be of interest.
As you know to go from 5800X3D to 7800X3D or 7950X you need: a new motherboard (AM5), RAM (DDR5), and possibly a bigger power supply. But since you are going for it, I would get the 7800X3D which is reliable and rugged. The 7950X does not seem to be so (so they say). Or wait for the 8000 series X3D which are also AM5/DDR5 (rumors are they will be cheaper too).