Moving parts wear down over time and eventually break. Desktop PCs also need access to cool air. The word “laptop” is misleading - when you place it on your actual lap, your legs both transmit heat to your laptop and also prevent cool air from cycling in to cool it down. Dust and other debris are a common cause of noisy computer fans. As dust collects on your computer fans, they no longer work effectively. Dust builds up inside your computer, especially if you’ve got a bulky desktop PC.
Your computer fan might be running in overdrive for a few reasons: But if you’re experiencing lots of desktop or laptop fan noise under normal circumstances, read on to see what the problem might be. So long as they calm down when you’re done, this isn’t necessarily something to worry about. When putting your computer through intensive tasks - such as while playing online video games, editing large multimedia files, or performing a CPU stress test - it’s normal to have loud computer fans. To keep heat levels down, the fans inside your computer start spinning to push the hot air out and cool down your PC. And the sensitive electrical components inside your PC are vulnerable to high temperatures. This super user post describes the problem & the solutions I used in more detail.Inside your computer is a lot of sophisticated hardware - your CPU, graphics card, power supply, and more. Also I turned down the clock speed, because silence and cool temps are more important to me than potential CPU speed. So in addition to doing the ASL temp/fan speed thing, I turned down the GPU. Apparently it was set this way to support the Aero graphics.
It wasn't the CPU that was generating the heat.
After investigating, it turns out a major culprit was the graphics chip, which was set to ALWAYS be on, with the default Windows Vista driver install. I had this problem on my laptop, waaay too much heat. So read up on it and get a temperature monitor (software app) before using this tool. Using this tool incorrectly or carelessly, you could set your fan to never turn on, which would cook your components straightaway. This will void your warranty and for good reason. Using that, you can set temp thresholds for various fan speeds. If you have Windows, and if you can't use speedfan, this is best done in the BIOS layer, with Microsoft's ASL Compiler.
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