Mac Pro 4,1 Fan noise

Discussion in 'Mac Pro' started by knowhate, Jan 31, 2014.

  1. knowhate, Jan 31, 2014
    Last edited: Oct 21, 2017 at 4:53 PM
  2. Studio K macrumors 6502

    Studio K

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    #2
    Which fans are too loud? IStat will display the speed for each fan. I'd be curious to see what iStat is showing.
     
  3. knowhate, Feb 1, 2014
    Last edited: Oct 18, 2014

    knowhate thread starter macrumors regular

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  4. Studio K macrumors 6502

    Studio K

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    #4
    They all appear to be going faster than normal. But it's the Booster fans that are really going fast.
    Intake and Exhaust are only modestly faster than normal and would not be audible at 957rpm.
    Expansion is about 400rpm above normal but still not fast enough to be very noisy.
    The Booster fans would be kind of noisy at 2500rpm. They would normally be running at 1100 each.

    How long has it been like this? Did you ever bring it to Apple?
     
  5. knowhate, Feb 1, 2014
    Last edited: Oct 18, 2014

    knowhate thread starter macrumors regular

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  6. Studio K macrumors 6502

    Studio K

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    #6
    Those fan speeds are quite strange. Who would have thought an SMC reset would make the Booster fans speed up even more???

    The Booster fans are mounted inside each cpu heat sink. They are more insulated than the other fans and are, therefore, harder to hear. But at those rpms, they would be kind of noisy.

    I just cannot imagine what's causing those CPU fans to spin so fast. Perhaps you could pull the CPU tray and remove the heatsinks just to have a look around under there. Mabye put some new thermal paste on the processors.
    Probably won't fix the problem, but it's worth a look.

    I guess this all started after Apple Care expired? Bringing to Apple would be your best bet, I think.
     
  7. knowhate, Feb 1, 2014
    Last edited: Oct 18, 2014

    knowhate thread starter macrumors regular

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  8. superdx macrumors regular

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  9. Macsonic macrumors 65816

    Macsonic

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    #9
    Sorry to hear about your fan speed problem. Though this may not be the solution, you can try a SMC Reset http://support.apple.com/kb/ht3964

    A second option is a Hardware Reset which you will disassemble all the internal parts and place them back in so as to reset everything.
     
  10. knowhate, Jun 26, 2014
    Last edited: Oct 18, 2014

    knowhate thread starter macrumors regular

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  11. h9826790, Jun 26, 2014
    Last edited: Jun 27, 2014

    h9826790 macrumors 604

    h9826790

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    #11
    The 4870 indeed is very noisy when loaded.

    Anyway, did you ever try to do a clean OSX install? It may fix the CPU fan problem.

    Also, I've experienced quite a few times that high fan speed after SMC reset. Don't know the reason. My fix is

    1) Open smcFanControl
    2) set all the fan to 100%
    3) wait for about 10 seconds
    4) set it back to default

    The fans may need few minutes to slowly get back to the normal speed. This usually able to fix the problem. No need to do another SMC + PRAM reset.

    If the graphic card fan speed too high without any loading. Run LuxMark benchmark once usually able to fix the problem.

    But these work around only works if there is no real loading to the CPU / GPU. If there is some software issue (e.g. kernel task keep running at 100%), the CPU fan of course will run high to protect the CPU and try to cool it down. You may check the Energy tap in activity monitor to see if there is anything loaded up your Mac, and cause the CPU hotter than normal.
     
  12. Fangio, Jun 26, 2014
    Last edited: Jun 27, 2014

    Fangio macrumors 6502

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    #12
  13. ofawx macrumors newbie

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    Sep 26, 2013
    #13
    I used to run a 4870, and as others have said, it is very loud under load. That said, when not stressed, it was no louder than any other fan.

    One possibility worth considering, depending on your 4870's history, could be failure of some sort.

    After 4 years of service mine became increasingly loud over a period of weeks, even at idle. Despite being fairly clean, I cleaned the dust out, to no avail, which led me suspect a mechanical failure of some sort in the actual GPU fan (sound became less 'fan'-like, more mechanical grinding. Bearings perhaps?)

    I elected to replace the whole GPU as it didn't make sense to me to put money into a 5 year old GPU, but if you've got parts available replacing the fan could be an option.
     
  14. GHelf macrumors newbie

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    Jan 1, 2012
    #14
    Hello,

    I have a 12 core Mac Pro with fans also running fast. Does anyone know if there is a reference for how fast fans are supposes to be running at idle (start up, no apps running) for 12 2.93ghz, 5.1 mac pro?

    Thanks.
     
  15. Plutonius macrumors 603

    Plutonius

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    #15
    Maybe your graphics card needs to be replaced. The 7950 I put in my Mac Pro 4,1 works well and is quiet.
     
  16. h9826790 macrumors 604

    h9826790

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    #16
    In my Hex Mac Pro, the idle RPM is 600 for most of the fan, and the booster fan is around 900RPM.
     
  17. GHelf macrumors newbie

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    Jan 1, 2012
    #17
    Thanks. All my fans were around 1000 rpm and boost fans were up around 1900.

    Still under applecare. Brought it into Apple store. They are running further tests. They were really cagey when I asked what the exact rpm's for the box should be and would not provide an exact number, only that mine seemed a little high. I got the impression that if nothing turns up on a test, I am on my own.
     
  18. mikeboss macrumors 65816

    mikeboss

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    #18
    hex 3.46 GHz idling

    Booster Fan CPU A: 850 RPM
    Exhaust Fan: 600 RPM
    Fan Expansion Slots: 800 RPM
    Intake Fan: 600 RPM
    Power Supply Fan: 600 RPM

    all five fans running at their specified lower limit, except Booster Fan which has a lower limit of 800 RPM.
     
  19. GHelf macrumors newbie

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    Jan 1, 2012
    #19
    mikeboss,

    is your machine a 6 core or a 12 core, and, how can I find what the specified lower limits are for each fan on my machine?

    thanks.
     
  20. h9826790 macrumors 604

    h9826790

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    #20
    You can simply install SMC fan control, and read the default fan lower limit from it's default fan profile setting.
     
  21. mikeboss macrumors 65816

    mikeboss

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    #21
    hex = 6-core

    Hardware Monitor (licensed version) shows the upper and lower limits.
    http://www.bresink.com/osx/HardwareMonitor.html
     
  22. TzunamiOSX macrumors regular

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    #22
    Perhaps the TE has the Northbridge Chip cooler problem? What's the temp of the Northbridge Chip in °C?
     
  23. Plutonius macrumors 603

    Plutonius

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    #23
    Doing a search, it looks like the ATI 4870 can get very hot and loud when under loading conditions. The recent versions of OS X puts much more stress on the GPU then older versions.
     
  24. Emen Mali macrumors newbie

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    Jul 22, 2014
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    Chicago, Illinois
    #24
    I just upgraded my Mac Pro 2009, from the original 8x2.26 to 12x3.33, while I was "in there" I upgraded the Airport to AC and BT 4.0, 5870 to 7950. The only problem I have is Booster 1 (Fan I assume) is 0rpm, the fans are revving pretty high and this is at 0. I'm currently using Macs Control Fan to bring the noise down and have set 2 fans (intake and exhaust) to Ambient.
    Is Booster1 the CPU A heatsink fan? Anyone I can tell if its likely to be damaged?
     
  25. TzunamiOSX, Aug 2, 2014
    Last edited: Aug 2, 2014

    TzunamiOSX macrumors regular

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    #25
    https://web.archive.org/web/2013102...Photography/2013/07/08/mac-pro-2009-part-tbd/

    and pictures
    http://puier.lofter.com/post/80c4b_6a8195

    Booster is a fan inside the cooler (main cpu cooler). CPU A is the rear CPU. I think your fan connector has no contact.

    If one fan don't work, it is not very intelligent to use Software like Macs Control Fan and ignore the problem. You will destroy your CPU by overheating.

    SOLVE THE PROBLEM that you caused by your bad tech skills!
     

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