Question What the heck happened here? (AM5 and stock heatsink)

[mikeymikec]

The quality is a bit potato because I didn't realise I had the macro lens in use. A customer contacted me saying a computer they had just built wouldn't start, so I visited and went through the routine (it wasn't POSTing, no display, no beeps) until I found this (see images).

The processor (Ryzen 7700) was bought new and the AMD Prism heatsink came with it. My only theory is that the CPU has been sitting in stock for so long that the paste dried out (it felt completely dry), but I've never seen stock AMD paste look like that, with the circular pattern being so uniform. The computer likely wouldn't boot because of a bent CPU socket pin (I didn't see the point in reinstalling the heatsink and trying again, I didn't have paste with me).

 

[digitaldreamer]

Looks like the ideal way thermal paste would be applied quickly and uniformly in an assembly line.

 

[coercitiv]

My only theory is that the CPU has been sitting in stock for so long that the paste dried out (it felt completely dry)

Was that heatsink fastened properly? To me it almost looks like uneven pressure on top of whatever issue the pre-applied paste had.

 

[igor_kavinski]

I don't think it's an issue. If the CPU gets hot enough, the paste should melt.

 

[mikeymikec]

Interestingly, I went on ebay and found an AMD Prism with an underside pic:

So at least that explains the pattern. I'm wondering if an improperly fitted heatsink with the paste getting slowly cooked by the processor is the reason for it being dried out.

In contrast, this is what unused paste on the AMD Wraith Stealth looks like:



I've had that cooler sat unused for likely years and the paste is still moist. I wonder why there are different techniques being used by AMD for applying the paste, maybe two companies are being contracted to produce the heatsink products.

 

[coercitiv]

I don't think it's an issue. If the CPU gets hot enough, the paste should melt.

Sounds like no thermal cycles happened since the system did not POST.

 

[Hail The Brain Slug]

Sounds like no thermal cycles happened since the system did not POST.

I agree, if the system never worked, the paste never got a chance to break in through thermal cycling.

There doesnt appear to be anything wrong here and you probably could have just reinstalled the heatsink.

 

[mikeymikec]

I agree, if the system never worked, the paste never got a chance to break in through thermal cycling.

There doesnt appear to be anything wrong here and you probably could have just reinstalled the heatsink.

You mean apart from the bent CPU socket pin and the fact that the system wouldn't POST?

 

[Hail The Brain Slug]

You mean apart from the bent CPU socket pin and the fact that the system wouldn't POST?

You made the thread to ask about the thermal paste, didn't you?