Solved i9 13900k is thermal throttling when it was okay before

PC SPECS:
i9 13900k
Nzxt Z73 360mm AIO
RTX 4090
Asus rog strix z790-f gaming
DDR5 g.skill triden z5 6400mhz cl32



Hello, I built a pc 1month ago and i had only a decent case with 6fans but with a lot of tuning and experimenting I managed
to make it work increadibly well. On CineBench R23 i would get 92C max temperature with the score of 40.50k pts and also
I'm using contact frame. Later on I decided to change the case and go for Lian Li o11 dynamic evo with 10fans 6 intake and 4
exhaust and idle cpu core temps spikes to 71C for a second, cpu package spikes to 67C and stays at 52C If i start CineBench R23 test it would thermal throttle and crash
i kept the undervolt the exact same as in my previous case -0.075 but also tried different numbers which didn't help even if i lock P1 P2 to 125w 253w it would thermal throttle which is weird because previously with the exact same cooler i had unlimited power with undervolt -0.075 and it would pull 282w and max temps would get to 92C with amazing score on cinebench meanwhile now its pulling 300-320w when it's thermal throttling at 253w.. I did repaste thermal paste to kryonout thermal grizzly multiple times, reinstalled brackets, contact frame and nothing seemed to be out of place, I did uninstall the cooler and gave it a shake it few times i thought maybe there's a airbluble trapped but also didn't help also mounted radiator on the on the side as on my previous case it used to be on front but also didn't help. Fans are going at 100% and pump is also at 100% 2830RPM. I've tried playing Hogwarts legacy at ultra settings + ultra raytracing and cpu would stay at 62-65C but spikes would go to 85C sometimes meanwhile in my previous case it wouldn't spike at all. I do hear pump working there's no gurgling sound or anything water is flowing and you can hear it. Also I changed ram from 5600mhz 4x16 to 6400mhz 2x32 and I see people running them at 1.45v but i can't set them to 1.45v in the bios it only lets me go for 1.435 or 1.425 cant recall. Forgot to mention that in the bios there's a setting for multicore enchancment i did set it to enable which sets power take to unlimited but even if i set it to disable enforce all limits which caps the power at 253w its thermal throttling which drives me crazy as i had it working increadibly well and now i can't make it work even with lower wattage take. The only thing that actually changed is nzxt z73 fans they're no longer original fans and I use Lian Li Uni Fan SL-INF 120 so it matches my case fans. Right now i ordered a new water cooler EK Nucleus AIO CR360 Lux D-RGB which is also 360mm but i've heard many good reviews about it and maybe maybe it will solve this increadibly annoying issue that i have as for right now i have no clue what to do i even contacted nzxt support and followed their instructions but nothing really worked.

veeg said:

Let's see what @Pyro has to say.

Give us your complete psu spec's.

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Corsair RM1000X Gold or Platinum

Pyro said:

Multicore enhancement is possibly your issue, it's a workaround by MOBO manufacturers to get better scores from their board by dodging the power/turbo limits. Leaving it on allows the processor to run at 100% as long as it can, which is usually the culprit for thermal issues with the 13th gen afaik.

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Yeah but in my previous case it was working just fine so it doesn’t make sense that with a new case it’s thermal throttling when before with the previous case it would stay at 92C max but also would use 282w and bios settings are the exact same and it doesn’t matter what I change in the bios it would still thermal throttle.

xrobwx71 said:

Let us know the results after installing this. No need to tinker further if this solves your issue.

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I agree. I should get it on July 19th will let you know.

Pyro said:

Something as insignificant as a spec of dust could could have shifted and started causing issues. These chips run way too hard compared to the surface area of the IHS, cooling them is an absolute monster of a task if you let them runaway. I understand you want max performance but MCE has a host of problems even with a good water cooler, it might be worth trying without it.

Another thing to think about, Intel may deny future warranty claims if you're not running factory speeds and powerlimits, whether that matters or not is up to you.

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even if multicore is disabled and it is running at 253w as it should according to intel its thermal throttling i have zero clue why is that but i really hope the new cooler will make it work somewhat better as now at stock speeds its throttling.

xrobwx71 said:

Let us know the results after installing this. No need to tinker further if this solves your issue.

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I just recieved another cooler and it did solve the issue.