But you need to see that the processor is not always hot. The solution here is to replace the fan itself. The most common cause why a CPU fan would run at full speed is that its sensor is not working properly. Sensor Problem causes CPU Fan to run full speed always It can also be an issue of the heat sink on the processor. If the CPU fan runs at full speed all the time, there might be something wrong either with the processor or the sensor (in the fan). The processor generally uses a sensor that controls the fan speed. A CPU fan runs at full speed whenever the temperature of CPU increases. We’ve already talked about the first reason. Let’s check out the main reasons why a CPU fan runs at full speed all the time and how to fix it. Since many people call it CPU, we will call it CPU fan. In this article, we’ll limit ourselves to the fan attached to the processor which is used to keep the processor cool. For example, if you use an old desktop, your SMPS also has a fan. There may be other fans in your computer, based on its type and model. As such, CPU fan runs faster when you are gaming on the computer, just to keep the processor cool. If the CPU is heating, the sensor will make the fan run faster. It is attached to CPU not only with power pins/wires but also a sensor that tells it how fast to run.
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