I have found it much more difficult to tune fan curves for quiet operation on Ryzen than on Intel chips. There are frequent short surges in fan speed, presumably caused by frequent short surges in core temperature. This happens at normal load just above idle, e.g just web browsing and YouTube.

This has happened with a few different brands of motherboards, in multiple chassis with different brands of fans, so I think it's a characteristic of the Ryzen platform rather than a specific motherboard brand or BIOS.

It's really odd and annoying, and I've resorted to fan curves that keep the fan on low RPM until just before the CPU hits 90C -- basically flat with a big hockey stick inflection at the end.