Low CPU usage, but high CPU temps

Hi, Im getting low CPU usage (like 15-20%) but high temps (83C) on my Ryzen 5900X.
-Minecraft Launcher 1.20.4 using Iris Fabric + Sodium Indium with 8G RAM (32 in system) and RTX 2080.
-360 AIO that cools very good almost any other game, Its just the first time I see more than 80C when CPU usage is that low, all 9 fans go 1800RPM.
-When I turn off the DH mod it goes back to 60C
Thank you so much for the help!
Solution
You can change the thread settings to maybe not use all 12 cores. 10 is probably pretty good, and leaves 2 cores to do things like consistently render the game.
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