The same thing was happening with my GPU so I underclocked and undervolted it to hell using msi afterburner and now instead of getting 85 C during gaming sessions it’s around 70 C. my CPU fan is always loud. i think the thermal paste is gone. I’m not willing to take my computer apart because where my computer is it’s really awkward and if it bricks itself i have the money to buy a new one. rn the package temp is idling at 46-55 C, jumping every second. min temp is 45 C. the max temp is 80 C idling according to hwmonitor. i’m getting spikes in high temperature that last a second or so but when I’m playing a game it can spike to 95-100 C
UPDATE: Disabled Boost and undervolted my CPU, now temp spikes are much more reasonable. Max idle temp after 1 hour according to hwmonitor is 53 C which is a lot better than random spikes to 80 C lol. thx to everyone who commented!
You didn’t list the hardware or what the temps used to be before this. Assuming it’s a recent increase from sane normals, your best course of action is to move the system, give it a thorough cleaning, and change the thermal interface material. Underclock / undervolt is a temporary solution as inadequate heat dissipation can still occur even if the temps appear normal, degradation will continue.
You won’t brick the computer by moving it and changing the thermal paste. If you’re not confident enough, just watch a video or two online about how to handle the system, I bet there’s videos of your specific hardware out there. You’re more likely to incorrectly configure the hardware via software controls than you are to damage it by swapping the thermal paste.