An exclusive video of the warm-up process shows a Ryzen of the 3. generation and the two hotspots. The existence of a thermal protection circuit of the I/O Die would remain to be questioned. The CPU should be used at approx. 120 degrees just switch off, but the risk of a counter-test was too high for me. And how to mount the water block for a better cooling result? I'll show you in the video!
More about the problem of asymmetric processor design you can also find in my article "Does the Ryzen 3000 have real problems with current CPU water blocks and DHT air coolers due to its asymetric design?", but now the video is finally available as a (partial) resolution.