Just realized most thermal paste mistakes come from using too much, not too little

I was swapping a CPU on a customer's rig last Tuesday and noticed the old paste had spread all over the edges of the socket. Turns out they globbed on a pea-sized drop but it was way too much for their old Intel chip. I see this at least twice a month in my shop - people think more paste equals better cooling but it just makes a mess and can even short things out. Has anyone else had to clean up a paste overflow that caused boot issues?

3 comments

3 Comments

ellis.susan22d ago

Yeah, 'more paste equals better cooling' is exactly the mindset I see causing trouble. I once had a guy bring in a gaming laptop that wouldn't even POST, and when I popped the heatsink off, the paste had squished out so far it was bridging two capacitors near the socket. A proper pea-sized dot is usually plenty for a standard desktop chip, but I've learned that chip size matters too. Ryzen chips with their larger IHS can handle a bit more, but old Intel chips like the one I had last Tuesday really only need a tiny dab in the middle. That overflow can trap heat against the socket and cause boot issues like you said, plus it's a pain to clean with isopropyl alcohol if it gets under the CPU. So yeah, less really is more in this case.

val_williams22d ago

You're spot on about chip size mattering. I started doing a thin cross pattern on my Ryzens and it's been working great without any messy overflow.

sarah81821d ago

What kind of paste are you using? I had a bad time with the really thick stuff because it flows weird and leaves gaps. I switched to a thinner thermal paste and now I do a small line in the center of the CPU, kind of like a tiny grain of rice, and spread it flat with a plastic card. Never had overflow again and temps dropped by a couple degrees. It takes a little practice but the peace of mind is worth it.