Trust me:
I scaled “down” from a 5950X (!) to a 5800X3D before I switched to my current AM5 system, and the performance increase in MSFS was STAGGERING. I know it’s hard to believe since the only difference is a little L3 cache, but MSFS is one of those applications that does make serious use of that extra cache and among all the AM4 processors the 5800X3D is a real gem!
I promise you: you will regret it, if you go with only the 5800X.
If you currently don’t have the money to buy the 5800X3D wait till after Christmas. Prices usually drop then or check if you can score some BlackFriday/CyberMonday deal or get a used one on eBay.
(BTW: How can you have a Xeon with a B550 board?)
Edit:
Just remembered this thread:
It starts with this screenshot:
