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4 pin motherboard fan схематический вид разъема
4 pin motherboard fan  разъем
at the PC Motherboard
For 4-Wire Pulse Width Modulation (PWM) Controlled Fans
Pin
Number		 Pin
Name		 Description Wire color
(usual)
1 GND Ground black
2 +12V Fan Power yellow
3 SIGNAL Fan RPM green
4 PWM Digital Control blue

 

3-pin fan and 4 pin motherboard connector compatibility: 

A fan with a 3-pin power connector may be easilly fitted into desktop board with a 4-pin fan header


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