Mac Pro 5,1 psu fan speed

Discussion in 'Mac Pro' started by mereditp99, Mar 2, 2012.

  1. mereditp99 macrumors newbie

    Joined:
    Mar 2, 2012
    #1
    I've just acquired a 2010 4 core 3.2 mac pro, running Lion and with the optional 5870

    The psu fan seems quite noisy and running smc fan control I can see it's running at 1500rpm with no load on the system

    Reading around other people are getting 600rpm at idle, but looking at smc settings my *minimum* speed is 1500. I can increase it, but not take it any lower :confused:

    The Pro was very dusty inside when I got it and I've cleaned out everything I can see with an air can, but not the psu as that seemed a slightly bigger job taking things apart.

    Is it possible a dusty/clogged psu will make the fan spin faster?

    All fan speeds:

    pci 1500rpm
    ps 1500rpm
    exhaust 600rpm
    intake 600rpm
    boosta 856rpm

    Temps running 24-28C.

    Thanks, Pete
     
  2. mereditp99 thread starter macrumors newbie

    Joined:
    Mar 2, 2012
    #2
    update - tried a PRAM and SMC reset, made no difference
     
  3. derbothaus macrumors 601

    derbothaus

    Joined:
    Jul 17, 2010
    #3
    Yes. Very possible.
     
  4. BigJohno macrumors 65816

    Joined:
    Jan 1, 2007
    Location:
    San Francisco
    #4
    Take the CD drive tray out and you can get access to the fan. Then just blow a ton of air through there.
     
  5. mereditp99 thread starter macrumors newbie

    Joined:
    Mar 2, 2012
    #5
    Well, that made absolutely no difference.

    Does anyone which temperature sensor drives the psu fan, and where it is?

    Might try installing Snow Leopard and see if that makes a difference :(
     
  6. mereditp99 thread starter macrumors newbie

    Joined:
    Mar 2, 2012
    #6
    yep, psu fan down to 675 rpm after a clean SL install.

    very strange. time to start installing/patching things one step at a time I guess.
     

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