Honestly, the way people treat old thermal paste drives me nuts

I see techs all the time saying you should always replace the thermal paste on any machine you open, even if it's just for a quick clean. Tbh, that's a huge waste of time and money if the paste is still good. I've pulled apart hundreds of office PCs from the early 2010s, and the factory paste is often still fine after a decade if the system wasn't running hot. I tested this on a batch of 30 Dell Optiplex 9020s from a local school. I cleaned the dust, left the old paste, and ran a stress test. Every single one stayed under 75C. Re-pasting all of them would have added over an hour to the job for zero gain. When do you actually need to replace it? Only if it's dried out, cracked, or the temps are bad. Has anyone else found they're re-pasting way less than the common advice says?

3 comments

3 Comments

joseph_ellis851mo ago

Your Optiplex test proves the point. I only repaste if temps are high.

grace_gonzalez461mo ago

Totally get what you're saying, @joseph_ellis85. I only crack it open if the CPU is hitting like 95 under load or the fan is screaming nonstop. On those Optiplexes, the stock paste is often dried out, so a fresh bead of something cheap can drop temps 10-15 degrees easy.

jessica_robinson231mo ago

The thing is, waiting for high temps can already mean some thermal damage over time. On those old office PCs, the paste is often a crusty brick by year five. I repaste them as soon as I get one, even if it seems okay. It's cheap prevention and the temps are always better.