Say hello to your front panel cables.
Computer case fan connector types.
Fan header connection types with few exceptions computer fans come in either 3 pin or 4 pin varieties.
This means that the wire which attaches the fan to the motherboard has either three prongs at its connection point or four.
When connecting a three wire fan to a four pin fan header the fan is always on.
Actually the 3 pin connector is newer.
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The 3 pin connector provides power to the fan and optionally if the fan supports it monitoring of the speed of the fan.
The connectors on 3 pin models carry three signals.
But you will need to connect the power and reset buttons at the very least.
If you d rather not have bits blinking away at you in the darkness then by all means leave the led connectors out.
Computer fans commonly come in standard sizes and are powered and controlled using 3 pin or 4 pin fan connectors.
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Chassis and processor fans use either a three wire or four wire connector.
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There is no fan control.
Both axial and sometimes centrifugal blower squirrel cage fans are used in computers.
A three wire fan connecting to a four pin fan header.
Does your fan have two wires connectors if the fan supports monitoring then you get the added benifit.
Power ground and a speed sensor.