I have a 3080 Ti, I9-11900 and 128GB on Samsung Pro NVMe PCIe-4 drives and have no problems running on Ultra at 60FPS. I do use Rolling Cache of 64GB on a separate drive than where the sim is installed.
It does slow down a little when landing at major airports, but still not bad.
How much RAM does your PC have. You need at least 32GB and 64GB to have a good margin for other stuff running.