The four wire connectors are for processor fans with higher power consumption.
Computer case fan connector types.
Chassis and processor fans use either a three wire or four wire connector.
The three wire connectors are for small chassis fans with lower power consumption.
Power ground and a speed sensor.
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Fan header connection types with few exceptions computer fans come in either 3 pin or 4 pin varieties.
Computer fans commonly come in standard sizes and are powered and controlled using 3 pin or 4 pin fan connectors.
Say hello to your front panel cables.
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Actually the 3 pin connector is newer.
Both axial and sometimes centrifugal blower squirrel cage fans are used in computers.
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There is no fan control.
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.
A three wire fan connecting to a four pin fan header.
But you will need to connect the power and reset buttons at the very least.
Does your fan have two wires connectors if the fan supports monitoring then you get the added benifit.
The connectors on 3 pin models carry three signals.
The 3 pin connector provides power to the fan and optionally if the fan supports it monitoring of the speed of the fan.