In this style of fan control, the fan is either on or off. Cooling fans equipped with either two- or three-pin connectors are usually designed to accept a wide range of input voltages, which directly affects the rotation speed of the blades. The color of the wires connected to these pins varies depending on the number of connectors, but the role of each pin is standardized and guaranteed to be the same on any system.
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A variable rotation speed allows the cooling rate to be adjusted to meet demand, quietening the fan and saving energy when full speed is not required. Fan assemblies with this control input provide the ability to adjust the rotational speed of the fan without changing the input voltage delivered to the cooling fan assembly.
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Since fan noise increases with the fifth power of the fan rotation speed, reducing revolutions per minute (RPM) by a small amount potentially means a large reduction in fan noise. Since they must move more air through the same area of space, fans will become more noisy.įans installed in a PC case can produce noise levels of up to 70 dB. The byproduct of increased heat generation is that the fan(s) need to move increasing amounts of air and thus need to be more powerful. Power supplies needed forced cooling, and power supply fans also circulated cooling air through the rest of the PC with the ATX standard. Processors in most early x86-based computers, up to some of the early 486s, did not need active ventilation. Heat production varies with system load, where periods of compute-intensive activity generate much more heat than the idle time does. Computers emit this electrical power as heat generated by all major components. Need for fan control Īs modern PCs grow more powerful so do their requirements for electrical power.
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This is commonly accomplished by the motherboards having hardware monitoring circuitry, which can be configured by the end-user through BIOS or other software to perform fan control. In computers, various types of computer fans are used to provide adequate cooling, and different fan control mechanisms balance their cooling capacities and noise they generate. At the top of the case is a fan controller.įan control is the management of the rotational speed of an electric fan. Full-tower computer cases may contain multiple cooling fans.
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