Question CPU suddenly overheating when stressed

[Vektor9]

Hey all. I have a pc that's about 8yrs old. It was working fine, then I cleaned it, (I know, silly me) now the cpu is overheating. The paste has already been reapplied. (By a professional. Not me.) The fans are all working fine. The liquid cooler appears to be working fine. Nothing else in the system overheats. Just the cpu. And it's only when it gets stressed. So, at rest, it's about 50°C. With light usage, 60°C. But if you stress it at all, it immediately shoots up to 100°C, and starts getting throttled. Any help would be greatly appreciated.

Here's a screenshot from HWiNFO64 and IPDT test results:

 

[hotaru.hino]

50C-60C doing light workloads is pretty high. I suspect whoever repasted the CPU didn't do a good job somewhere.

 

[geofelt]

Aio coolers do not last forever.
8 years is past due for replacement.
In time, the mechanical pump fails or collects debris.
Air will intrude through the tubes requiring the unit to be replaced.

Are all the fans working?
The aio radiator as well as the case intake fans?
HWinfo should tell you.

 

[dingo07]

I would take it apart and reapply thermal paste to the CPU, after cleaning all that may be there with acetone on a qtip, carefully. A good suggestion from above is to replace the AIO with a new unit also.

 

[Vektor9]

Aio coolers do not last forever.
8 years is past due for replacement.
In time, the mechanical pump fails or collects debris.
Air will intrude through the tubes requiring the unit to be replaced.

Are all the fans working?
The aio radiator as well as the case intake fans?
HWinfo should tell you.

It makes sense about the air cooler, I suppose. It would just be so odd that there was such a drastic change with just some light cleaning. And again, it does seem to be working properly.

And yes, all fans are working, including the radiator fans, and they all report fine.

 

[Vektor9]

50C-60C doing light workloads is pretty high. I suspect whoever repasted the CPU didn't do a good job somewhere.

I know 50-60 is high, but it does remain steady. I'm more concerned about the drastic spike when it gets stressed at all. Also, that it suddenly started doing it after some light cleaning.

Which also tells me that it wasn't the paste. The paste was also done twice. Once by me, and once by the professional. And when he took the cpu off to reapply it, it appeared perfectly fine as well.

 

[Vektor9]

I would take it apart and reapply thermal paste to the CPU, after cleaning all that may be there with acetone on a qtip, carefully. A good suggestion from above is to replace the AIO with a new unit also.

I think I'll just go with the new AIO unit then, I suppose. The paste was perfectly fine, and I trust that the professional did it fine as well. (I was there, and watched as he did it.) Again, it's just very odd that the AIO would suddenly stop working that drastically after some light cleaning, and still appear to be fine.