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I guess it's a general problem with these CPUs. If you set more than 5GHz with AVX then even the best chips fail longer high load or when they switch between AVX and no AVX or set higher/lower voltages.
Most reviews and overclocking results confirm about 5.2-5.3GHz on all cores without AVX when AVX offset is by default -3 so 4.9-5.0GHz with AVX in most cases. I had 5.1GHz with AVX on my CPU but I wasn't testing it for more than 1h as I was using it only for tests. Right now I started to test it for stability but in a small ITX PC so I can't give you any comparable results as you expect higher clocks.
Today I switched from 120 AIO to 92 AIO. I want to check how it runs compared to i5-10500 and maybe a bit higher clock keeping a similar power draw.
If anyone is interested, here is my result with 10900K and Asetek 92mm AIO closed in a Kolink Rocket ITX case.
[email protected], AVX -3, 1.08V ~125W max with AVX, max temp AVX = 96°C, max temp w/o AVX = 80°C (1h test in a closed case)
Before in the same case was i5-10500 - 95W max at 4.5GHz/4.2GHz AVX, max temps around 80°C
Today i'm also swapping out my cpu aio cooler from the thermaltake 2017 version to the x73 kraken aio 360. Mainly because the fans they have on the old TT arent being made anymore and any others cant interface with the controller. Maybe ill get lucky and the new one will cool slightly better. I also still use the pea size arctic silver 5 technique on the chip, i assumed tried and true.
Apply, mount and check how the TIM spreads. How much you need and the way you apply depends on used TIM. That pea size way usually leaves me parts of the IHS not covered. If you use arctic silver 5 then better change it to something else as new TIMs are usually better and spread also better. Something at least like MX4, Noctua NT-H2, Gelid Extreme, Grizzly Kryonaut ... the list is longer.
Most new AIO have well-performing fans. The main difference is usually how much noise they make. The performance depends more on the block/pump and the coldplate design. Because of that I guess that the new cooler should perform a bit better. As I remember, older TT coolers were pretty average but I'm not sure what about yours. When I'm using AIO in my test rig then it's usually Enermax.