Thank you Fiery! I attach a pic of the situation after the update.
Now, the CPU temp is at 86°C when idle and it needs 100% load for a whole minute to get to 87°C. Via IPMI, I get 36°C when idle. Also, now I can read the T_Sensor measuring the loop temp just before entering the hot section, which is great. But I get 50°C in AIDA64 and 28°C in the IPMI.
I also attach a new isa dump.
isasensordump_2.txt