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DELL fans use a different pin-layout than normal fans, so watch out before connecting them!

Posted by jpluimers on 2021/10/28

Some links on IBM X-series and DELL versus standard fan pin lay-outs (one day I will try to merge them into a better overview story):

  • [Wayback] 3 pin and 4 pin Fan Wire Diagrams | Cooler Master FAQ

    3 pin Fan Connections
    *cable coloring varies from fan to fan

    User-added image

    Pin Name Color Color Color Color
    1 Ground Black Black Gray Black
    2 +12v Red Black Gray Yellow
    3 Tach/Signal/Sense Yellow Black Gray Green

    4 pin Fan Connections
    *cable coloring varies from fan to fan

    User-added image

    Pin Name Color Color Color Color
    1 Ground Black Black Gray Black
    2 +12v Red Black Gray Yellow
    3 Tach/Signal/Sense Yellow Black Gray Green
    4 Control/PWM Blue Black Gray Blue
  • [Wayback] IBM X-series system fan connectors: sysxfanconn.png

  • [Archive.is] Solved: 780, CPU fan pin out – Dell Community
    Dell sometimes swaps the wires around so that you will fry a dell fan on standard and the other way round.
    It has 5 pins but only 4 wires are used.
    Dell does not publish this. And some dells use standard wiring.
    I believe this is correct.
    YMMV
    4PINS.png4pin PWM on 3 pin
    Dell MB
    Pin Number
    Function
    Dell wire color
    Std Fan
    Pin Number
    Std Fan wire color
    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
     
    DELLFANWIRES.pngDELL FAN WIRES AND COLORS

    [Archive.is] Solved: Fan pin out order – Dell Community

    The order is what is required for your specific model.
    I have seen no difference in the colors only the order of the pins.
    Note the Difference in this adapter.
    DELLFAN5.JPG
    So if your fan is NON standard you may need to remove the pins and re order them to be correct.  The fans are not any different only the wire order.
    Dell started making all the wires black so you cannot tell.  its not documented and its not the same on all dells all models all years.
    dell fans.jpgDELL VS INTEL FAN COLORSFANDAPTER.jpgDELL To Standard 4 pin adapterdellfanny2.jpgNote The KEYWAYdellfanny.jpgAnother ay to look at it
  • [Archive.is] Proprietary fan header issues – Dell Community
    Dell uses standard fans and the wires are swapped around in such a way that if you plug a standard fan onto the dell header you will fry the fan and the motherboard.
    None of this is documented.
    SOME models use standard wiring.
    Some Models use all black wires so you cannot tell.
    Dell Fan Wire  Black Red White or Yellow
    Dell 3 wire fan
    Dell 4 wire fan
    Dell 5 wire fan
    If you use adapter or re wire the standard fan to the way Dell does it there wont be any issues.
    Dell sometimes swaps the wires around so that you will fry a dell fan on standard and the other way round.
    It has 5 pins but only 4 wires are used.
    Dell does not publish this. And some dells now use standard wiring.
    I believe this is correct.
    YMMV
    4PINS.png4pin PWM on 3 pin
    Dell MB
    Pin Number
    Function
    Dell wire color
    Std Fan
    Pin Number
    Std Fan wire color
    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
     
    DELLFANWIRES.pngDELL FAN WIRES AND COLORS
    Dell does not use standard wiring or Pinouts on their fan headers.
    Dell fan wires are deliberately swapped round.
    PWM and Tach and 12v and Ground.
    For 3 wire they reverse 12v and tach. 
    Black Red White not
    Black White Red
    DELL3PIN.JPGDELL 3 PIN
    This can lead to self destruction for a dell fan on standard motherboard or the other way round.
    STANDARD.jpg
    This is the CPU FAN for Example.
    Dell MB
    Pin Number
    Function
    Dell wire color

    Pin #
    INTEL Fan wire color
    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
     
     
      
    DELLFANS.pngDELL FAN WIRING

–jeroen

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