This is still considered a 3 pin fan.
3 pin to 4 pin fan connector.
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A 4 pin pwm fan connector will have four square holes on the front and four wires entering the back.
Three wire and four wire fan connectors.
4 x tx3 3pin fan header.
2 pack usb to 3 pin 4 pin pwm 5v usb sleeved fan power adapter cable with switch usb to 3 pin 4 pin case fan adapter connector cable with on off switch.
1 to 4 way y splitter sleeved 4 pin molex male to 4x 3 pin 4 pin pwm male connector fan extension adapter cable 10166.
A four pin connector is a little different than the three pin connector since it has the extra fourth wire used for controlling and sending signals to the fan which likely has a chip on it that tells it to slow down or speed up in addition to the other wires the three pin connector has.
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This is probably why they are not able to speed control your fan.
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A 3 pin fan connector will be smaller in size than the 4 pin pwm fan connector.
The image below displaying is the difference between a 4 pin pwm fan connector left and a 3 pin fan connector right installing a 3 pin fan to the motherboard.
3 pin connectors are usually used for the smaller chassis fans with lower power consumption.
Enlabs tx3co4d 4 way 3 pin cpu cooler case fan speed controller w backed tap for internal mining cooling extra 5 5 2 1dc for router dissipate heat molex to 4 x 3pin fan hub.
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4 pin fan controllers hand off the pwm signal to the fan itself and these fan controllers supply an uncontrolled a 12vdc.
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Fans and on board fan headers are backwards compatible.
4 pin connectors are usually used by cpu fans with higher power consumption.
Chassis and cpu fans may use either 3 pin or 4 pin power connectors.
3 pin fans will power up at 4 pin connectors but only at full speed.