Actually the 3 pin connector is newer.
Computer case fan connector types.
This means that the wire which attaches the fan to the motherboard has either three prongs at its connection point or four.
But you will need to connect the power and reset buttons at the very least.
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There is no fan control.
The 3 pin connector provides power to the fan and optionally if the fan supports it monitoring of the speed of the fan.
Chassis and processor fans use either a three wire or four wire connector.
Bearing type is often a specification that is neglected when purchasing fans and while sleeve bearings are certainly the most affordable a few extra dollars well worth it in this comparison.
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Power ground and a speed sensor.
Both axial and sometimes centrifugal blower squirrel cage fans are used in computers.
If you d rather not have bits blinking away at you in the darkness then by all means leave the led connectors out.
The three wire connectors are for small chassis fans with lower power consumption.
Fan header connection types with few exceptions computer fans come in either 3 pin or 4 pin varieties.
Say hello to your front panel cables.
Does your fan have two wires connectors if the fan supports monitoring then you get the added benifit.
Usb3 far left front panel centre left speaker centre right and usb2 far right.
A three wire fan connecting to a four pin fan header.
When connecting a three wire fan to a four pin fan header the fan is always on.
Computer fans commonly come in standard sizes and are powered and controlled using 3 pin or 4 pin fan connectors.
