For the most part its a GPU thing. The one sim graphic setting that is really effected by the power of your CPU is the terrain level of detail. Everything else is GPU related. I’d bare in mind that there’s quite often not much of a difference in over all image quality between high and ultra settings.
I’ve got a 3080, which will quite happily have everything set on ultra at 4K and not do any complaining but if dial things down to high I don’t see much of a difference in image quality. Maybe clouds only but its really very slight.
With my 3080 and 5600X set up I find whenever I’m getting bad performance in the sim its mainly always when there’s a lot of other stuff going on in the scene. Live traffic, hugely detailed large third party airports and other badly optimised scenery and/or aircraft. Terrain LOD over 200% will kill things for me.