Question Temperature spikes / cinebench crashing i9-14900k

[Caliaton_]

Hi all, had some problems regarding the stress testing I did on my new cpu. System specs: 14900k, 4080 super, asus prime z790-a wifi, 64gb g skill trident z5 DDR5 6400, LT720 360mm AIO (fans maxed for this test).

Two main issues:
1 - temperature shoots up to 100 degrees Celsius immediately after starting the test, throttles a bit, then shortly thereafter drops to a more acceptable 80c and hovers there (still at 100% usage). Is this normal?
2 - Both Cinebench 2024 and r23 crash shortly after starting test while I have XMP enabled. I have DDR5 6400 ram but can only run the 10 minute test if XMP is disabled in bios. This leads me to believe keeping XMP enabled makes my whole system unstable even though all cores maxed is an unrealistic scenario.

The CPU is running fully stock speeds but I think the power limits may be disabled by my motherboard, because at one point my cpu was topping out at 350w despite intel's specs listing a max TDP of 253w. Does this mean I should power limit / undervolt? At the very least, cinebench r23 scores look on par with benchmarks I've looked at from reviews (40960 for multi core and 2334 for single core).

 

[thestryker]

Setting the CPU to use the proper 253W limit in the motherboard settings would be a good place to start.

 

[Lafong]

I think the power limits may be disabled by my motherboard,

I think that might be true...as far as I know it varies by motherboard and model.

Have you done any investigation into the BIOS or into your user manual regarding power limit settings?

 

[Caliaton_]

Just to update, I disabled "multicore enhancement" in the bios of my ASUS mobo and now my CPU caps out at 253w power draw as it should. Everything is stable now

 

[TheHerald]

It should not be crashing with power limits removed though. That's not normal behavior