A 4-pin CPU fan offers more advanced speed control options compared to older 3-pin fans. Here's how you can adjust the speed of a 4-pin CPU fan.

The fourth pin on a 4-pin CPU fan is used for PWM (Pulse Width Modulation) control. This allows the motherboard to vary the duty cycle of the electrical signal sent to the fan, thereby controlling its speed.

To adjust the speed of a 4-pin CPU fan, you can start by accessing the motherboard's BIOS settings. Look for a section related to hardware monitoring or fan control. In this section, you may find options to enable or disable PWM control and set the fan speed mode.

If the BIOS offers advanced fan control options, you can configure a fan curve based on temperature thresholds. For example, you can set the fan to run at a low speed when the CPU temperature is below a certain value and increase the speed as the temperature rises.

Alternatively, you can use third-party software tools for more precise control. Many fan control applications support 4-pin PWM fans and allow you to customize the fan curve and monitor real-time temperature and fan speed data.

When adjusting the speed of a 4-pin CPU fan, it's important to consider the cooling requirements of your system. A too-low fan speed may lead to overheating, while a too-high speed can cause excessive noise. Experiment with different settings to find the optimal balance.

In addition to adjusting the fan speed, you can also ensure proper airflow within the computer case by positioning the fan correctly and using additional case fans if necessary. Keeping the computer clean from dust can also improve cooling efficiency.

 adjusting the speed of a 4-pin CPU fan can be done through the motherboard's BIOS settings or third-party software tools. By taking advantage of PWM control, you can achieve more precise fan speed management and optimize system cooling and noise levels.