The fins of the heat away due to the heat generated when the CPU work is by conduction to the heat sink, then blowing cold air brought by the fan, the fan heat conduction with the size of the heatsink, generally , the greater the contact area of the heat sink and air, the better the cooling effect of the fan, but this statement is a premise, and that is enough free space in the chassis.
If the computer's chassis would have space for heat dissipation is not large, not enough space left, a very large area of the heat sink is difficult to install the chassis, even if reluctantly installed into the chassis, much of the contact area will also block heat sink the hot air around quickly dispersed, resulting in the overall temperature inside the chassis, so as to affect the operating performance of the entire computer, so I suggested that the heat sink size of the area should be chosen and chassis to match, can not be a pursuit of large area heat sink.
The blades of the fan exhaust volume is large, this argument is wrong because the fan exhaust volume is a comprehensive index, which is the most direct measure of the performance of a fan, its size is not only the size of the fan leaves related to the size, but also with the design in the form of the blade, fan thickness and blades of the declination. A large size of the fan blades, but the blades flat, it will not form any airflow, the fan exhaust volume is zero, so the relationship between the cooling fan exhaust volume, the angle of the blades is the decisive factor. Buy a fan, if we want to check the amount of exhaust fan, as long as the hand on the heat sink near to feel the strength of the wind blowing on it, usually large amount of exhaust fan, even though we are very far away from the fan location, you can feel the wind airflow.
Many people believe that the higher the fan speed, then at the same time, the more heat away from the CPU, the easier it so that the CPU cooling, the fact is not so. If the fan speed exceeds the standard value, then the fan is running in the overload case, a long time, the heat away from the CPU is smaller than the heat generated in the high-speed rotation process, so that a longer time to run, differential heat greater, such high fan speed not only can not play a very good cooling effect, but that the CPU temperature increased dramatically; Moreover, the higher the fan speed, noise may be generated during operation, the greater the worst case, could allow the fan or CPU scrapped off;, to get the high-speed operation of the fan, must also have greater power to provide power source and high power source is obtained from the motherboard and power supply in the high-power, motherboard and power supply in the overload power will often cause system instability. So, the higher the fan speed cooling the better argument is not valid.