Because the heat generated by CPU is conducted to the heat sink and then blown away by the cold air brought by the fan, the amount of heat conducted by the fan is related to the area of the heat sink. Generally speaking, the larger the contact area between the heat sink and the air, the better the cooling effect of the fan.
But this statement has a certain premise, that is, whether there is enough spare space in the chassis. If there is not enough space in the computer case, it will be difficult to install a large radiator in the case. Even if it can barely be installed in the chassis, the excessive contact area will hinder the rapid dissipation of hot air around the radiator, thus causing the overall temperature inside the chassis to be too high and affecting the running performance of the whole machine. Therefore, it is suggested that the size of the heat sink should match the chassis, and the heat sink with large area should not be pursued one by one.
Extended data:
Fan specification
1. Installation dimensions
CPU fans mainly use 60, 70, 80, 120 or even 140. What is the significance of this model? As we know, the frame shape of CPU fan is square, and its model is the side length of square. For example, if the side length of the fan frame is 60mm, the model number is 60. In addition, fans are thick and thin, and fans for CPU are thin.
Fans of the same size can be interchanged. For example, Tt Volcano 9 and cool music master HV8 1 are all fans of type 80. You can disassemble the fan of Volcano 9 and install it on the heat sink of HV8 1 without any problem. Some specially designed fans cannot be interchanged with other fans. For example, the fans of Intel original radiator are connected by clips and cannot be replaced.
2. Bearing type
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.
3. 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.
4. 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.
5. Wind direction
Can be divided into axial flow and centrifugal.
As the name implies, the outlet direction of the axial flow is along the fan shaft, that is, perpendicular to the rotating surface of the blade; The centrifugal air outlet direction is the air outlet in all directions along the diameter of the rotating surface of the blade. CPU radiators basically use axial flow fans, and only Coolermaster's "Tornado" series uses centrifugal fans.
From the actual effect, the wind of centrifugal fan can not be fully utilized, but it will increase the working noise, which is not a good choice. But the radiator with centrifugal fan is easier to be made thin, so it is often used in some graphics card cooling systems.
6. Lift the front wheel speed
It can be roughly divided into two types: strong type and silent type.
This classification is not too strict, but for fans of the same size and model, wind pressure and noise are always irreconcilable contradictions.
References:
CPU fans-Baidu Encyclopedia