The difference between a cheap thermal paste and a good one is way bigger than people think
I used to grab whatever generic paste was cheapest, thinking it was all the same goop. Last month, I had a gaming PC in the shop running 10 degrees Celsius hotter than it should. I cleaned it and put on my usual cheap paste, no change. On a whim, I spent $12 on a tube of Arctic MX-6 and redid it. The temps dropped a full 15 degrees under load, just like that. The cheap stuff dries out faster and doesn't spread as well, leaving tiny gaps you can't even see. That one tube has fixed three 'overheating mystery' machines for me already. It's not about the brand name, it's about the quality of the compound. Has anyone else seen a jump this big just from switching pastes?