Hi 7980XE owner here...
..not really for your problem: but i delid my cpu
with aida64 stresstest 1 1/2 hours the two hotest core were at 86 degrees,
after delid it was only at 59 degrees - thats 27 degrees less - that was in summer with 30 degrees room temperature.
I had a simular problem , not the same but it looks like it could be somhowe the same , in my case was that the LightingService.exe didnt work well with the corsair icue serviice .... , there was a little tutorial to make the icue service dominant and lightingservice depending on icue , the resold was that icue start first and when the service is startet then lighting starts secound , this fixes my problem , i have AIO Capellix 360 , if you have also this type of AIO maybe this could be also the problem what i had ... IF you have maybe the Corsair AIO then maybe this tutorial could help : https://forum.corsair.com/forums/topic/169652-tutorial-how-to-solve-icue-and-asus-aura-conflicts/