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5 pin IDC male connector layout
5 pin IDC male connector
at the Standard Fan socket
This is to fit a standard 4pin fan to a dell motherboard 5pin CPU (speed controlled) fan connector (essentially, you just swap pins 1 & 3 on the standard connector)

 

Dell MB
Pin Number
Function Dell wire colour Std Fan
Pin Number

Std Fan wire colour

Description
1 Sens (TACH) White/Yellow 3 Green Sens (TACH)
2 +12v Red 2 Yellow +12v
3 Gnd Black 1 Black Gnd
4 PWM Blue 4 Blue PWM
5 Key unused       

Generates fan error, but works sometimes.

4 pin single row female connector layout
4 pin single row female connector
According to 64 reports in our database (61 positive and 3 negative) this pinout should be correct.

Is this pinout
Dell 5 pin Fan connector to standard 4 pin PWM Fan visual pinout:click to enlarge
Source(s) of this and additional information: Self measured
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