this post was submitted on 14 Aug 2024
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It is definitely by design. The current generations from both manufacturers are absurdly efficient at dissipating heat from the die. The 3D cache layer knocks off some thermal headroom, but the modern chips are smart enough to thermal throttle before they hit their rated thermal ceiling. This is part of why undervolting is so effective with the AM4 and AM5 chips. For what it's worth, the AM4 Ryzens do not have temp spikes like this. And Intel seems to be hell-bent on making toaster ovens...
Weird that a Haswell i7 would run that hot -- unless I'm misremembering, you might have had one with the shitty thermal paste between the die and IHS; it wasn't an issue on all Haswell and Ivy Bridge chips, but they definitely had some QC issues with the paste drying out during those generations. I also had a 4790k in a workstation machine that I tricked work into paying for, and even on just a 120mm AIO (without the delid/liquid metal treatment), it still stayed below 60-65C during thermal torture tests (Linpack and Prime95 small FFTs). Maybe I did delid it and bring in some spare LM from home; it was a long time and several dead brain cells ago.