Question Ryzen 7800x3d running at 5000mhz (possible explanation below)

[imChill]

I recently noticed my Ryzen 7800X3D running at extremely high temperatures (90°C–100°C) while idle. On further inspection, I discovered that my AIO cooler (Deepcool LS720) had failed - there was air or dirt or something in the tubes. I never really turned the PC on after that, but recently did so when I needed to retrieve some important files. Despite the high CPU temperatures, and it being quite sluggish, I managed to recover them.

However, just as I was about to shut down the PC, I noticed something unusual - the PC was running much smoother and faster. Checking the temps again, I saw they had dropped to 40°C–50°C at idle, but the CPU frequency was now at its max - 5000MHz. Since then, every time I power on the PC, it runs at ~5000MHz (+/- 100MHz) constantly, which I definitely don’t want. I am guessing the high temperatures and it now running at high frequency is connected.

The AIO cooler supposedly has a 5-year warranty, and after contacting Deepcool, they requested proof of the CPU running at high temperatures. The problem is that the CPU no longer does.... Ideally, I need the system to replicate the overheating issue so I can claim the warranty while also addressing the CPU running at max frequency.

Any advice on how to approach this?

 

[helpstar]

run a cpu stress test or benchmark and check the temperatures while doing so

are you sure it´s really idling while you see it is 5GHz? check with hwinfo the minimum and the max. frequency

Is your bios of your motherboard up to date?

 

[Misgar]

every time I power on the PC, it runs at ~5000MHz (+/- 100MHz) constantly

Do all cores run at 5000MHz or just one or two cores? I suggest you try HWMonitor which shows individual core frequencies (min, max and current) plus individual core temperatures (min, max and current).
https://www.cpuid.com/softwares/hwmonitor.html

extremely high temperatures (90°C–100°C)

Are you certain you've seen temperatures above +90°C. The 7900X3D has a theoretical limit of +89°C at which point it should throttle, but I suppose it might go higher if the cooler has failed.

My 7950X hits +95°C and stays there (all cores) when running some video renders. This is normal behaviour on some very intensive apps.

Any advice on how to approach this?

For the time being, I'd fit a cheap Thermaltake Peerless Assassin 120 dual fan air cooler. It will allow you to see if everything's still OK, or confirm the CPU has been damaged.