Replacing a fan in 2009 Mac Pro

Discussion in 'Mac Pro' started by Studio K, May 24, 2013.

  1. Studio K, May 24, 2013
    Last edited: May 24, 2013

    Studio K macrumors 6502

    Studio K

    Feb 17, 2013
    United States
    Is it necessary to 'calibrate' a new fan if you need to replace one in the mac Pro?

    Or.....are they simply 'plug and play'?

    Does the SMC firmware automatcally take care of the fan speed for a new fan?

    I would be using the correct fan, of course.

    If calibration is needed, how to go about it? Apple Service Diagnostic, perhaps?
  2. GP-SE macrumors 6502

    Feb 27, 2013
    if the new fan you buy has the same part# and is essentially the same fan, then just plug in and it should spin at the same speed as the old fan.
  3. brand macrumors 601


    Oct 3, 2006
    That is sound advise.
  4. ScottishCaptain, May 24, 2013
    Last edited: May 24, 2013

    ScottishCaptain macrumors 6502a

    Oct 4, 2008


    There is only one proper replacement part number, and that is the part number you should be seeking to purchase. Any other part number (unless approved by Apple) may not work properly. The SMC assumes that you have the proper fan for your system installed, and as such when the SMC sets the fan speed a certain percentage, the fan tachometer sensor should read a certain number of RPMs. If the RPM is too high or too low for that speed, then the SMC will likely assume a fault and either shut down your computer or throttle up all the other fans.

    Then you will have no problems. Just get the same part number you're replacing, unless Apple replaced that part number with a newer revision.

    There is no calibration for the Intel machines, not even in ASD. The only thing ASD does is test to make sure the fan reaches maximum speed (by comparing the fan's speed at 100% to a built-in table of values), and that the rotor is turning (tach signal is greater then 0).

  5. jblagden macrumors 65816


    Aug 16, 2013
    Where did you buy it?
  6. ActionableMango macrumors G3


    Sep 21, 2010
    He posted that in 2013, so hopefully he's sorted it out by now. :rolleyes:

    Or, if you are looking to buy a replacement fan, I bought one at

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