1.The blades of the CPU fan are "eccentric"
In general, the center of gravity of the cpu fan blade is on the shaft, which is very stable and has little noise. If the quality of the cpu fan is not good, the center of gravity of the fan blade does not cause "eccentricity" on the shaft. After the fan rotates, the bearing of the fan is gradually worn, the vibration is intensified and the noise is increased. If you are a gamer, the impact is even greater.
2.cpu fan bearing is short of oil.
If the cpu fan is used for a long time, the lubricating oil inside will dry up.
3. The climate is cold
In winter, the ambient temperature is low. Generally, the noise of the power supply fan is loud when it is started, and gradually decreases after preheating. The distribution of silica gel on the contact surface between CPU fan radiator and CPU is uneven, and there are grooves on the radiator, which leads to high fan speed and increased noise.
4. There is too much dust on the 4.CPU fan.
The Cpu fan has been used for a long time, and a lot of dust has accumulated on the fan blades. If it is in a dusty and humid environment, dust will form on the fan. First of all, it will cause the speed to drop and affect the heat dissipation effect. Secondly, the rotation resistance of the fan will increase, and at the same time, due to the low dynamic balance, the fan will have a greater noise.
Extended data
Three ways to maintain cpu fan:
1, dust removal. The CPU fan will become significantly larger after a period of use. Dust is one of the important reasons for the increase of fan noise. When the CPU fan rotates at high speed, the vortex effect makes dust easily attached to the fan. At this time, the CPU fan should be removed and cleaned well.
2. Add lubricating oil. For oil-containing fans, the motor drive shaft becomes inflexible after working for a long time. Lubricating oil is recommended for this position, and mechanical lubricating oil or gasoline engine oil is recommended.
3. Reduce vibration. Usually, a high-speed rotating fan will hit the heat sink at high frequency. If the fan and heat sink are stable and suitable, the vibration and noise caused by collision can be greatly reduced.
Baidu encyclopedia -cpu fan