i like ASRock but with the new AM4 platform a few things are very strange.

Hardware:

ASRock AB350 Gaming ITX

Ryzen 5 1600X with a LC Power Cosmo Cool LC-CC-120 (max TDP 180W)

No Case (open Build on a Lian Li ITX test bench)

Problem one:

My AB350 Gaming ITX throttling the CPU at 75°C real Temp (Tdie) or 95°C offset temp (Tctl).

AMD integrate the +20°C offset to influence the fan control. Throttling should happen at 95°C real Temp or 115°C offset temp. Ryzen CPU without "X" will throttle at 95°C real Temp.

Next question:

Why does ASRock use its own temp sensor for fan control? This sensor is a way behind the cpu temp and inert.

I have two pictures to illustrate the problem.

The First shows the values schortly after startup of a cpu intesive application. 

The temperature is rising.

The second picture shows the throttling of the clock and the voltage after reaching the 95°C offset temerature. Throttling should begin at 95°C real temp (Tdie) or 115°C offset temp.

http://abload.de/image.php%3cimg=throttlinguebtp.jpg" rel="nofollow">

Below you can see the CPU temperature used for the fan control. This is much too low (66.5°C) and very lethargic.