Noise from air cooling and water cooling

        A problem that many people often mention is that the noise of water cooling is lower than that of air cooling. This is actually a wrong idea.

       Let me talk about the conclusion and then the reason. Under short-term load, the noise of water cooling is indeed lower than that of air cooling, but under long-term loads such as games or rendering, the noise of water cooling and air cooling should be the same or even the noise of water cooling will be louder. a little.  Why is this so?

       First, where does the noise come from? Fans are the biggest source of noise in computers. Most of the noise you hear comes from chassis fans or radiator fans. Both air-cooling and water-cooling have fans. Therefore, it has never been said that water-cooling has low noise. Because the water-cooled fan and the air-cooled one are of the same specification.  Then, because air cooling uses heat pipes, the heat will instantly be transferred to the fins. At this time, the fan needs to speed up the speed immediately and quickly discharge the heat. Water cooling, as anyone who has studied junior high school physics, knows that water has a high specific heat capacity. Can hold more heat, so you are using the temperature of the CPU to heat the water in the waterway, then the water temperature rises very slowly, so the fan does not need to increase the speed, it can rotate slowly, wait for the temperature If it is high, then speed up the speed. 

       Therefore, under short-term load, the speed of the water-cooled fan is lower than that of air-cooled. However, under long-term load, because the water temperature is high, the water-cooling has to speed up the fan speed to reduce the water temperature, assuming that the fins are arranged In the same way, according to the law of conservation of energy, under the condition of discharging the same heat, the fan speed of air cooling and water cooling is theoretically the same, but many air cooling is a double-tower structure overlapping front and back. This structure is definitely not as efficient as spreading it out. The water cooling is high. The other is that the only noise source of air cooling is the fan. In addition to the fan, the water cooling has a water pump. Because the temperature is high, the water pump must also run at full speed. Therefore, the water pump speed will also make noise. Except for the water pump, if there are bubbles in the waterway , Then you will still hear the sound of water, so the noise of water cooling under long-term load will actually be slightly higher than that of air cooling, because air cooling only has fans.