In the BIOS there's a setting to increase the minimum speed of the dual rear fans. Keep the case closed for the best air flow. Temps on my systems run 70-75 but since Tcase on those CPUs is 81C I let them run.
Cores 1 and 5 on each of the cpus is running 76-77 while all the other cores on both cpus are 68-72. That seem strange? Where in the bios do I find the setting for the fans? I am missing it.