this thing is also a nightmare, if you do it manualy, an keep the fan seeting in manual, once you boot again the pc and you want to continue tweaking the fan, you have to do fan test again to have acces to the curve of the fan, if you do it without, the curve of the fan you are tweaking will go back to a automatic setting...which is really really stupid.
it also mean that each time you want to tweak the fan because of noise and spee, remember to write down what you have in front of you, since once you redo the test, the curve of those fan will be back to previous automatic,
X399-A Prime - latest BIOS.. the fan control smoothing is definitely broken. With a mild overclock my temps seem to spike up and down and the fans likewise. No amount of playing with smoothing times makes a bit of difference.
Had to take OC off just to make the thing quiet again. Defeats the object of allowing OC in BIOS if the fan control is broken 😞