That's about right, when I had a 5950X and 4090, the 4090 is some games even at 4K with maxed out settings it was hovering at around 90% to 95% GPU usage in certain scenes, the Division 2 and FC6 were two of those games. Swapped to the 5800X3D and it was able to keep the GPU at full load just about in the Division 2 but still a bit limited in FC6, so a 5090 is really going to need at least a 7800XD and faster at 4K native to keep that GPU at full load most of the time, especially with DLSS even on quality and RT on top.