The 5800X tends to run hot when under high all core load, its tuned for a higher all core frequency than the 5600X, 5900X and 5950X, all core it runs at about 4.7Ghz in Cinebench where as the other 3 only run at about 4.3Ghz all core.
Its just the way the 5800X is, its seems to be the one where AMD have said "this one is all balls to the wall, because reasons" trouble with that is it runs much hotter than the other 3.
I think maybe
@Loxa is tarring them all with the 5800X brush.
Its not a problem anyway, the 5800X is just not the right CPU for people who just want to plug it in and play and expect cool temps without doing anything to it, if you want that get one of the other 3, however with a bit of tweaking the 5800X can run less hot and still boost to 4.7Ghz all core and <5Ghz in games.