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4 pin motherboard fan  connector layout
Разъем 4 pin motherboard fan


Description Wire color
1 +12v Fan Power  Green mark
2 Signal   White mark
3 GND Ground non marked
4 PWM +5v (on/off control)
The Rpm Fan control can do with a normal fan bus.
While it can be driven by a 5 volt digital PWM signal, it is, in fact, an analog fan speed control signal.  0 volts = off, 5 volts = 100%, 2.5 volts = 50%, ... 
inside delta fan (behind label), red mark 


4 pin fan cable connector layout
Разъем 4 pin fan cable
На распиновку Apple Motherboard 4 pin CPU PWM fan connector есть 4 отзыв(а): 3 положительных и 0 отрицательных.

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