![]() ![]() Resistors in series with a fan's power pin are the simplest method of reducing fan noise, but they add to the heat generated inside the computer case. There are a few ways to perform this regulation, as described below. By varying the voltage input across the acceptable range for a fan, the speed of the fan will increase (to added voltage) and decrease (to reduced voltage) a faster fan means more air moved and thus a higher heat exchange rate. This control method reduces noise issues and power requirements during periods of low usage, but when the system is operating at capacity, the fan noise can become a problem again.Ī standard cooling fan is a DC motor with blades attached. When the temperature drops below a threshold again, the fans are turned back off. Temperature inside the chassis is checked, and if an outside-of-range temperature is detected, fans are set to their maximum speed. 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. 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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