In a computer system, the noise generated by DC computer case fans can be quite bothersome. However, there are several effective techniques to mute these fans.

Firstly, proper fan placement is crucial. Ensure that the fans are installed in a way that they do not vibrate against the computer case. Use rubber grommets or anti - vibration mounts when installing the fans. These soft materials can absorb the vibrations produced by the spinning fan blades, reducing the noise transferred to the case. For example, instead of directly screwing the fan onto the metal case, inserting rubber grommets between the fan and the case screws can make a significant difference in noise reduction.

Secondly, adjusting the fan speed can also help in reducing noise. Most modern motherboards or fan controllers allow you to adjust the fan speed according to the system's temperature. When the computer is not under heavy load and the temperature is relatively low, you can set the fan to run at a lower speed. This not only reduces the noise but also saves power. Software - based fan control utilities can be used to create custom fan speed profiles, such as increasing the speed gradually as the temperature rises.

Another technique is to choose high - quality fans with features designed for low - noise operation. Look for fans with larger blades and a lower RPM (Revolutions Per Minute) rating. Larger blades can move the same amount of air at a lower speed, resulting in less noise. Additionally, some fans have special aerodynamic designs that reduce turbulence and the associated noise when the blades are spinning.