![]() On fans that have this fourth pin, the motherboard (or video card) can control the speed of the fan, usually automatically depending on the CPU or GPU (graphics chip) load. ![]() This value can be read at the motherboard setup (see Figure 4) or through a monitoring program, such as Motherboard Monitor. Finally, the fourth pin is a speed control input, also known as a PWM (Pulse Width Modulation) control, provided by the motherboard. The third pin is connected to the fan speed sensor, reporting the current fan speed to the motherboard. The first two pins supply the voltage required for the fan to spin. Notice that the counting is done with the key present on the connector facing up.įigure 1: Connector from a CPU fan using three pinsįigure 2: Connector from a CPU fan using four pinsįigure 3: CPU fan connector on a motherboard, you can install either three- or four-pin fan connectors here In Figures 1 and 2 you can see a three- and a four-pin connector, respectively. Second, all fans are fed with +12 V however, several fans use a red wire on their +12 V line, which is different from the color code used by the power supply, where red means +5 V.Īlso notice that during this tutorial, our examples will use a CPU fan, but everything we say is valid for any kind of fan located inside the PC: video card fan, chipset fan, case fan, etc. First, the color of the wires may change depending on the fan manufacturer. There are two important things to notice here. Below you have a breakdown of the function of each pin and the most common color for the wire attached to that pin. ![]() In this tutorial, we will give you detailed instructions on how to do that, thus reducing the noise produced by your PC.įans can have two, three or four wires. – to run at three different speed levels (low, medium and high) without spending any money at all? This is possible by just changing the configuration of the wires used by the fan. Did you know that you can modify any fan located inside your PC – CPU fan, VGA fan, north bridge fan, case fan, etc. ![]()
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