overheat mobo can damage chipset and that is little highest from review 990X mobo with 51Cmax, check ambient temperature .. or fix your air flow
Ambient is very cool as its in my basement. Airflow is not a problem i have 8 fans in a 912 with most of the wires behind the mobo... you can feel the air being dispursed out the back and top and all my fans have 70+ CFM so they move alot of air.
my new thought is to lower the voltage on the NB. what do you think?