Question AMD CPU stuck at 3.57 GHz, apps crash, SHUTDOWN = black screen with fans running

[Stuartr734]

After 10 - 20 minutes after startup the cpu is stuck at 3.57GHz, various apps start crashing (CPUID, HWinfo, Ryzen Master, chrome).
Windows shutdown turns the screen black with the fans running continuously. Forced to do a manual shutdown.
I've tried replacing the motherboard and the problem still persists.

Specs:
CPU: Ryzen 9 3900x
GPU: AMD Radeon RX 6600 MSI Mech 2x
Motherboard: Asus Prime x570-p
PSU: Cooler Master MWE 80Plus 650W
SSD: Samsung 980 500gb m.2
RAM: Kingston Fury beast DDR4 3200mhz 16GB

 

[Deleted member 14196]

That PSU looks suspicious

 

[TerryLaze]

Have you looked at temps? 3.6 is below even the base clock.
If all cores stick to a certain clock then you could have some all core boost set, O/C that your setup can't support.
You could also upload a few pics from your bios so that people can check if there is any suspicious setting.

 

[Stuartr734]

Have you looked at temps? 3.6 is below even the base clock.
If all cores stick to a certain clock then you could have some all core boost set, O/C that your setup can't support.
You could also upload a few pics from your bios so that people can check if there is any suspicious setting.

I may not have made it clear, that the cpu's clock speeds are perfectly normal until about 10 - 20 minutes after boot.
Here are some photos as you suggested.

Yeah, temp is very high in bios. I believe voltage is also very high (default settings)?

 

[TerryLaze]

Yeah 1.44V for the core is extremely high.
If you had it running like that for years it might not be fixable anymore, high voltage degrades the CPU over time so that it needs higher and higher vcore for the same clocks.
While max vcore is stated at 1.5V that is for perfect compliance that you will never find, a lot of mobos send more V to the CPU than what they state in bios.
Also since this is in bios under full load the vcore will probably be even higher since it is set to auto.
Plenty of videos o youtube that talk about this.

 

[Stuartr734]

Yeah 1.44V for the core is extremely high.
If you had it running like that for years it might not be fixable anymore, high voltage degrades the CPU over time so that it needs higher and higher vcore for the same clocks.
While max vcore is stated at 1.5V that is for perfect compliance that you will never find, a lot of mobos send more V to the CPU than what they state in bios.
Also since this is in bios under full load the vcore will probably be even higher since it is set to auto.
Plenty of videos o youtube that talk about this.

Thanks,
looks like this could very well be the issue. It is only a 10 month old cpu, so really wouldn't have thought it could be damaged like this under such a short time frame.
The last thing to do is to replace the cpu to rule out all other possibilities.

 

[Stuartr734]

Issue was the CPU.
Tried CPU in 3 different motherboards and 2 entirely different PC systems, and the problem would follow the CPU.
Replaced my main PC with a new Ryzen and now the problem is no longer present.