Want to read more answers from other tech-savvy Stack Exchange users? Check out the full discussion thread here. Have something to add to the explanation? Sound off in the comments. Source: Three Wire and Four Wire Fan Connectors Note: When connecting a three wire fan to a four pin fan header, the fan is always on there is no fan control.Ī four wire fan connecting to a four pin fan header:Ī four wire fan connecting to a three pin fan header: The four wire connectors are for processor fans with higher power consumption.Ī three wire fan connecting to a four pin fan header: Select a store to see pricing & availability.
The three wire connectors are for small chassis fans with lower power consumption. Select a store to see pricing & availability or search by City & State or Zip: Wattage (W): 6.5 Watt. Pin 1 starts at the other end, just inside one of the ridges. With this type, fan speed is typically controlled by increasing or decreasing the voltage over the power wire.Ī 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).Ĭhassis and processor fans use either a three wire or four wire connector. The hole on the fan connector at one end that is OUTSIDE the ridges is Pin 4. The signal wire measures how fast the fan is moving without any controls for the fan’s speed. SuperUser contributor Homey_D_Clown_IT has the answer for us:Ī three pin connector is basically power (5/12 volt), ground, and signal. 12 volt fan - Best Buy 8 items Sort By: RoadPro 12-Volt Ceramic Heater/Fan RPSL-681 - Black Model: RPSL-681 SKU: 6481961 (7) 30.99 Save 12 Was 42.99 Thermaltake - Riing 12 LED 120mm Radiator Cooling Fan - White Color: White Model: CL-F038-PL12WT-A SKU: 4401201 (1,708) 12.99 Save 4 Was 16.
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