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Fan Connections

ffemterb
By ffemterb
in Cooling
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I know that 4 pin fans let you control the fan RPMs but my question is, is there a difference between connecting to a 3 pin chassis fan connection, a 4 pin chassis fan connection, and a 3 pin fan power connection?

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I know that 4 pin fans let you control the fan RPMs but my question is, is there a difference between connecting to a 3 pin chassis fan connection, a 4 pin chassis fan connection, and a 3 pin fan power connection?

3pin Chassis fan = 3pin fan power (Uses Voltage control, not as precise)

4pin = PWM (Much more precise)

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If you connect 4pin/PWM fan into 3pin/DC header, you can only control it with DC. Like said, it isn't very accurate and most mobos limit it to 7V for lowest setting. Also using 3pin fan with 4pin header doesn't make fan PWM. Controlling will be same as it would when connected to 3pin header.

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