Pro tip: I used to think you could skip the thermal paste check on any PC that wasn't overheating. A customer brought in a machine from a coffee shop in Tacoma that was randomly shutting down, and the paste was completely dried out even though the temps looked okay in a quick test.

The shutdowns only happened under a very specific load, like when their point-of-sale software printed a receipt and updated inventory at the same time. A five-minute stress test showed normal temps, but a longer, mixed workload test I ran for about 20 minutes finally spiked the CPU. Re-pasting fixed it. Now I make it a point to check the paste condition on any machine over three years old, regardless of the initial temp read. What's the oldest dried-out paste you've seen that was still sort of working?

3 comments

3 Comments

eric_price2mo agoMost Upvoted

Yeah, @sanchez.robin's Optiplex story fits. It's like how people ignore small car noises until the whole thing dies on the highway.

sanchez.robin2mo ago

I had the same mindset about paste until a 2012 Dell Optiplex came in with a weird boot loop. The thermal compound was basically dust, but it would still post for a minute.

graytorres17d ago

Right on about "basically dust." I've seen paste so old and crusty it looked more like a weird little cracker than something meant to transfer heat. The wild part is how long those machines keep limping along, you know? If the paste is old enough to crumble, it's already past the point of doing its job, so just swapping it out is cheap insurance even if the temps look fine. My rule of thumb is if the machine is over four years old and I've got the heatsink off for any reason, old paste gets replaced without even checking it. Better to spend the five bucks and ten minutes than chase a phantom shutdown issue later.