[DrewRu]

Hi…A 2-pin fan generally has on the end of its wires a male 4-pin Molex connector, but only 2 pins are used. That mates with a power supply connector directly from the PSU. Done that way, it always runs at full speed. Instead, if it is plugged into a third-party fan controller, that unit will supply a voltage that may be reduced (for slower fan speed) by changing the manual setting on the controller – usually, a knob that turns. It also might be possible to get an adapter to allow you to connect such a fan to a mobo 3-pin fan port, thus allowing the mobo to control the fan’s speed (but see comment later on speed monitoring). 2-pin fans have no way to send out a speed signal, so you cannot measure the speed of such a fan.

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