Welcome to the club… 
I have very similar case (but I have Core 3 on 100C while Core 0 on 82-86C max on multicore stress test). Results are here: High CPU temperatures at low utilization - #27 by Dmitry_Elsakov
Welcome to the club…
I have very similar case (but I have Core 3 on 100C while Core 0 on 82-86C max on multicore stress test). Results are here: High CPU temperatures at low utilization - #27 by Dmitry_Elsakov