Need help identifying fan's connector

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vMax
It is the older Molex connector, so must be connector to Power Supply Molex cable..

If your motherboard has a 3 pin or 4 pin fan header try to get a more modern fan with a PWM (4 pin) or 3 pin fan connector..
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gl189420

Sep 18, 2018
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I've got two 4 pins marked as CHA FAN. Will those do for a pwm fan?
 
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Paperdoc

Polypheme
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Oct 19, 2006
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You are getting confused by concentrating on pin count. 4-pin fans use the PWM system and they have FOUR WIRES from the fan motor because they need all of them for the signals required between mobo header and fan. If you look closely at the pics you linked, the WIRES from the motor count only TWO. Those are for the +12 VDC and Ground connections to the motor. In those pics, they are connected to only two of the four possible positions of a Molex connector. A 4-pin Molex power output connector from a PSU contains +12 VDC and +5 VDC lines, plus two Ground lines. So you can provide the full 12 VDC supply to any fan from only two of those lines, BUT that fan can ONLY run at full speed that way.

It is possible to rig a way to connect that fan's +12 VDC and Ground wires to those signals from a mobo 3-pin fan header and control its speed that way because that type of header varies the voltage on the +VDC line. BUT that fan does NOT have a third wire to report its speed to the mobo header, so the mobo will warn you that the fan has failed (it has no speed). Rigging that fan to a 4-pin mobo fan header is trickier and might work, depending on details of the header. But bottom line, you would be better off with a fan designed for the common 3- or 4-pin computer connection to a mobo header, depending on which type of header you mobo has.
 
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