In terms of the material of the heat sink, the thermal conductivity of each material is different. The thermal conductivity is arranged from high to low. They are silver, copper, aluminum, and steel. However, it would be too expensive to use silver as a heat sink, so the best solution is to use copper. Although aluminum is much cheaper, it is obviously not as good as copper in thermal conductivity (about 50% of copper). At present, the commonly used heat sink materials are copper and aluminum alloy, both of which have their own advantages and disadvantages. Copper has good thermal conductivity, but it is more expensive, difficult to process, too heavy (many pure copper radiators exceed the weight limit of the CPU), small heat capacity, and easy to oxidize. The pure aluminum is too soft to be used directly. The aluminum alloy used can provide sufficient hardness. The advantages of aluminum alloy are low price and light weight, but the thermal conductivity is much worse than copper. Some radiators take their own strengths and embed a copper plate on the aluminum alloy radiator base.

There have been a large number of low-quality and low-quality electronic radiators on the market. Such radiators are far from the national industry standards in terms of radiator material, processing requirements, and component quality. The service life and the quality of the whole machine have a great influence. Users can be identified from the following aspects when choosing:

1 The quality of the material (purity, thickness, processing accuracy, etc.) and manufacturing process (cracks, shrinkage holes, etc. caused by casting), inferior materials and rough and defective processes will directly affect the thermal conductivity of the radiator;

2 The surface roughness and flatness of the radiator contacting the mesa directly affect the contact thermal resistance and pressure drop;

3 The disc spring used for the radiator should ensure that the free height should be stable after being flattened for 24 hours, otherwise the spring may fail after a period of use, which will result in poor contact between the radiator and the die.