New PSU fan installation question.

Discussion in 'PowerPC Macs' started by powermi, Feb 22, 2015.

  1. powermi macrumors regular

    Joined:
    Apr 6, 2013
    Location:
    Avila (Spain)
    #1
    Hi Folks. i am looking for changing the PSU fan in my QS powermac. And i wonder if there is any difference between plug it on the 3 pin PSU bracket or to any standard 4 PIN, like the hard-disks. seems to be easier to just use the 4 PIN connector, cause the 3 seems not to mach properly with the fan.

    cheers.
     
  2. ctmpkmlec4 macrumors 6502

    ctmpkmlec4

    Joined:
    Jul 4, 2014
    Location:
    Lyons, KS
    #2
    I suggest you use a fan which already has the 3-pin connector.
     
  3. MatthewLTL macrumors 68000

    MatthewLTL

    Joined:
    Jan 22, 2015
    Location:
    Rochester, MN
    #3
    It is really your choice. Question is do you want it controlled or uncontrolled? If you use a 3 pin connector (any PC Case fan should work) you might have to chop the connector and rearange the wires to make it work. If you do 4 pin the fan will be running at 12V at ALL times so make sure you dont get a loud one. a fan between 30 and 80CFM will not be that loud. I have had to replace PC fans by powering it via Molex because the power supply's internal plug died. I even had one PSU Die because the fan seized up.
     
  4. powermi thread starter macrumors regular

    Joined:
    Apr 6, 2013
    Location:
    Avila (Spain)
    #4
    thanks, so as i see.. 3 pin is going to be controlled. So it would be more quiet then to plug in to the PSU board.
     
  5. MatthewLTL macrumors 68000

    MatthewLTL

    Joined:
    Jan 22, 2015
    Location:
    Rochester, MN
    #5
    Yes, exactly.
     

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