I came from a 5800x to 5800x3d and 2080-3080ti-4080…
The 4080 came first, usually from the 3080ti at ultra 4k volumetric clouds with fog my gpu usage with be around 90-100% depending on the location. On the 4080 its about 70-75%. But the framerate will still drop if you are in a heavy scenery area plus ai traffic like FSTL. 5800x3d almost solves that problem. And if you are open to frame generation then i am getting around 80fps (i capped at 80 fps as getting higher i cant notice it anymore) but there will be little annoyances from frame generation like ghosting if you are willing to trade.