I am using Noctua NH-L9x65 SE-AM4, but I get following temperature readings
Motherboard ASUS B350 Prime Plus
BIOS : ~68 °C
Ryzen Master : 56 °C
ASUS Dual Intelligent Processors 5 Dashboard : ~68 °C
Inconsistencies everywhere. The fan control is messed up because of this and the cooler is running at high rpms. I checked the thermal paste and the heat sink and it is very cool.
You can change the fan speed temperature thresholds in BIOS. I have mine at 58-63-67 C (Low-Med-High). Asus changed the temperature offsets, and it doesn't look like they're going to change them back.
Ryzen Master is probably the one you want to trust for actual temps when stress testing, but the BIOS temps are what the fan controller uses.-