i7 4790k sudden overheating: could dust alone be the culprit?

jzman86

Prominent
Jul 5, 2017
1
0
510
Hi,

Today I turned on my water-cooled desktop and upon loading OSX my cpu temps spiked into the high 90s (celsius) and hovered around 100c before I shut it off. This has never been a problem before, in the 3 years since I built this computer. The cpu almost never goes above 70c for any reason. There is still water running through the pump, and all of the fans seem to be working (they were going nuts when it read 100c, as could be expected).

I air-dusted the bejeezus out of everything and started it again: and it's back down to 40s and low 50s idle.

My question is, could dust alone be responsible for a 50c spike?? And so suddenly? It seems kind of crazy to me that it would make more than a 10-20c difference, unless it somehow clogged the pump fan.

I just wanted to check before I go nuts and re-seat everything / apply new paste. Let me know what you think?

Thanks in advance.
 
Solution
Dust can build up over time, even in a PC that is running. Filters on you case can be your friend here. It also doesn't hurt to blow out any dust accumulation every so often like you just did. You may need a positive pressure case (more air going in than out) to help filters do their jobs too.

The dustier your environment, the more you should keep tabs on the dust and get it out at more frequent and regular intervals.

As others have said, that dust is evil to your airflow. It can choke it off and cause things to overheat.
Dust can block airflow almost completely and that can and will lead to high temperatures. I had a laptop before that was overheating. I took it apart and the thing had a huge wall of dust blocking all of the air almost completely. So I've experienced this first hand.
 

Eximo

Titan
Ambassador
Air bubbles are another possible cause. If one happens to get stuck in just the right place a component can overheat. You jostling around during cleaning could have dislodged it. (As can the act of turning it off and on again)
 
Dust can build up over time, even in a PC that is running. Filters on you case can be your friend here. It also doesn't hurt to blow out any dust accumulation every so often like you just did. You may need a positive pressure case (more air going in than out) to help filters do their jobs too.

The dustier your environment, the more you should keep tabs on the dust and get it out at more frequent and regular intervals.

As others have said, that dust is evil to your airflow. It can choke it off and cause things to overheat.
 
Solution