In order to cool them down your fan needs to speed up to ensure that this happens otherwise your component will likely burn out. The more demand that is placed upon your components the more active they become and they get hotter. I’m talking about the CPU, memory and other stuff that makes your laptop actually work. Why a laptop fan runs fastįans are there to cool down the components within a laptop which get hot as they are used. Please make sure this doesn’t happen, read on to find out to prevent this. However, before you start reducing the speed of your fan it’s important that you understand why it is running fast in the first place otherwise you may end up breaking your laptop. In the design of a hardware platform, the decision to use passive cooling or active cooling is based on the physical characteristics of the hardware platform, the power source for the platform, and how the platform will be used. Passive cooling decreases the power consumed by the devices in a thermal zone active cooling increases power consumption. To perform active cooling, the operating system turns on a cooling device, such as a fan. As a rule, throttling limits device performance. Throttling might involve reducing the frequency of the clock that drives a device, lowering the voltage supplied to the device, or turning off a part of the device. To perform passive cooling, the operating system throttles one or more devices in the thermal zone to reduce the heat generated by these devices. These actions can be categorized as either passive cooling or active cooling. When a thermal zone starts to overheat, the operating system can take actions to cool down the devices in the zone. Sensor devices track the temperature in each thermal zone.

The Advanced Configuration and Power Interface (ACPI) enables the vendor for a hardware platform to partition the platform into regions called thermal zones.

This works (and to quote Microsoft) because: Change advanced power settings > Processor power management > System cooling policy

Speedfan for laptop