The signal wire measures how fast the fan is moving without any controls for the fan s speed.
Can 3 pin fan plug into 4 pin.
With this type fan speed is typically controlled by increasing or decreasing the voltage over the power wire.
Identifying fan type 3 pin or 4 pin pwm.
My rig has 2 pairs of 3 pin fans phanteks ph140sp connected to two 4 pin motherboard headers asus z97m plus via basic y splitters and they work and control just fine.
A 4 pin pwm fan connector will have four square holes on the front and four wires entering the back.
This is still considered a 3 pin fan.
Some fans may have a 4 pin connector but only 3 wires going into the back of the connector.
You can then use fan xpert to create a.
3 x tx3 3pin fan.
You can plug a 3 pin fan into a 4 pin header just fine.
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When connected to 3 pin fan headers the fan will run at full speed unless the mainboard supports voltage based speed control.
You can simply connect our fan s 3 pin connector to the 4 pin pwm sockets of today s mainboards so that the fourth pin that transmits the pwm signal is left blank due to the shape of the connector there s no danger of reversing polarity.
A three pin connector is basically power 5 12 volt ground and signal.
Please note that 4 pin fans can also be connected to your mainboard s 3 pin fan headers though.
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The 4 pin headers accept 3 pin fans line up the connector properly and it will slide into place.