1.CPU fan overview:
In fact, CPU fans and heat sinks use them to quickly conduct the heat of CPU and blow it into the nearby air. The cooling effect is directly related to the quality of CPU cooling fan and heat sink.
The main performance of 2.2. CPU fan:
The main performance of the fan is reflected in the following aspects: speed, blade shape and blade.
cpu fan
Angle and orientation system. Generally speaking, the rotating speed of the fan is indicated in the instruction manual of the radiator. Generally speaking, 30% of the heat dissipation effect of radiator depends on the speed of fan. But the higher the fan speed, the better. The correct fan speed should be determined according to the calorific value of CPU, and the selection of fan speed of different specifications should be different. The basic principle is: under the premise of generating the same air volume, the larger the fan, the lower the rotation speed and the lower the noise. Generally, the rotation speed between 3500 and 5200 rpm is more conventional.
The greater the power, the stronger the fan wind power and the better the heat dissipation effect. The power of the fan is directly related to the speed of the fan, that is, the higher the speed of the fan, the stronger the fan will be. Most of the fans sold in the computer market are DC 12V, and the power is from 0. X W to 5.04W, so the power needs to be selected according to the calorific value of your CPU. Special reminder, you can't emphasize high power unilaterally, just match the power of CPU itself. Excessive power will not greatly enhance the heat dissipation effect, but may increase the workload of the computer and eventually shorten the life of CPU and fan. Therefore, when choosing CPU power, it is necessary to be "hot".
A good radiator has no burr at the edge, no deformation of the radiator, smooth bottom and no crack, neat appearance, generous shape, warranty, anti-counterfeiting mark or other trademarks. In addition, when choosing the radiator, we should also pay attention to the bottom of the radiator not to be too thick, because the thermal conductivity of aluminum is not very good, and too thick will affect heat transfer; In addition, the guide grooves on the surface of the radiator should be dense, which can ensure that the radiator can have a larger contact area with the air, thus enhancing the heat dissipation effect.
Classification of CPU fans
It can be roughly divided into three categories: sliding bearing, ball+sliding bearing and double ball bearing.
Among the three kinds of bearings, sliding bearing has the least noise, but the shortest life and is greatly influenced by the environment. Double ball bearings are the mainstream because of their high noise, long service life and simple manufacturing process. There are also some improved sliding bearings, which greatly extend the service life under the premise of keeping low noise and become the darling of some high-end radiators. Among them, Sunon magnetic bearing and AVC hydraulic bearing are better improved.
Blade shape
There are sickle type, trapezoidal type and AVC patent folding type.
Relatively speaking, sickle-shaped fan blades are quiet when running, but the wind pressure is also small; Trapezoidal fan blades are prone to generate large wind pressure, but the noise is relatively large. Flanging is the best design, which can generate large wind pressure while keeping low noise, but it appears less.
Number of blades
The blades of CPU fan are generally between 6 and 12.
Generally speaking, the number of blades is small, which is easy to produce large wind pressure, but the running noise is also large; And the number of blades is just the opposite.