Buzzing PSU in my MacPro 2012

Discussion in 'Mac Pro' started by TzunamiOSX, Apr 3, 2016.


Does your Mac Pro 2009-2012 power supply buzzing similar to the video

  1. Yes, my PSU is buzzing

    11 vote(s)
  2. No, i have a silent PSU

    4 vote(s)
  3. I don't hear any buzzing in this video or from my PSU

    2 vote(s)
  1. TzunamiOSX macrumors 6502

    Oct 4, 2009
    My PSU is buzzing and i need a feeback from other Mac Pro owners (my PSU was changed 3 times, an all are buzzing).

    Please, put your ear near the left side of the power connector, listen, vote.

  2. ifraaank macrumors regular


    Jun 25, 2012
    Odense C, Denmark
    Mine says this as well when I put the Mac Pro under load. :)
  3. iOrbit macrumors 6502a

    Mar 8, 2012
    i bought my 12 core 2010 MP from eBay recently, and noticed a buzzing sound (its not loud or especially audible above the other sounds in the machine) but its there. i don't feel it should make that sound but i don't know.

    the one in the clip sounds more aggressive to me, but its hard to say. i'll see if i can get a recording done.
  4. bax2003 macrumors 6502a


    Dec 25, 2011
    My MP 1,1 PSU iz buzzing like crazy. 5,1 is silent for now.

    1,1 has Delta PSU, 5,1 has AcBel PSU.
  5. mostafiz28 macrumors member

    Feb 16, 2013
    Mine buzzes too but the noise is very faint. But its there.
  6. iOrbit macrumors 6502a

    Mar 8, 2012
    can anyone say in general if this is a sign of a failing PSU or something to worry about?

    I'm already worried about my GPU fan being noisy, but the GPU is a much cheaper fix than a Mac Pro PSU!
  7. ActionableMango macrumors G3


    Sep 21, 2010
    Could be a sign of dirty power. I had a buzzing power supply in a PC, then I hooked it up to a line conditioner and it became quiet.

    Unfortunately the line conditioner also buzzed, so that's not a great solution for someone recording music or whatever. The dirtier the power (quantified by LED indicators), the more it buzzed.
  8. TzunamiOSX, Apr 4, 2016
    Last edited: Apr 4, 2016

    TzunamiOSX thread starter macrumors 6502

    Oct 4, 2009
    Than the Apple Store has the same dirty power, too. I have used a drinking straw to locate the buzzing, and it looks like the buzzing came from the big coil on the lower left side of the PSU. So it is not dirty power, it is a low budget coil.
  9. 666sheep macrumors 68040


    Dec 7, 2009
    Your poll lacks 4th option: I don't care

    These low budget coils are durable enough to last 6 and more years od 24/7/365. MP PSU rarily works with more than 60% load. Nothing to worry about.
  10. TzunamiOSX thread starter macrumors 6502

    Oct 4, 2009
  11. Rick Green macrumors newbie

    Rick Green

    Feb 13, 2019
    Probably late to reply but I was looking for opinions on Mac Pro PSU buzz and came across this.
    I bought my 2009 Mac Pro 5.1 just under a month ago and suddenly noticed the PSU being very noisy like the one in the recording above (even when the machine was off but plugged into the wall)

    So I told the seller and he sent me a replacement PSU, this one is noisy as well but only when the Mac is powered on.

    I'm honestly scared as if I place my ear next to the PSU it's buzzing like crazy but can't really hear it when I'm normally sat at my desk.

    I'm just looking to know if I need to be worried or not.
  12. bsbeamer macrumors 68000

    Sep 19, 2012
    Have you checked your power source? Low voltage or watt limiting is notorious for making this buzzing noise. If you do not have testing tools, hook your machine up to a UPS device and check the display for in/out volts and watts to at least get a rough estimate.
  13. Alex Sanders74 macrumors regular

    Alex Sanders74

    Nov 26, 2013
    Toronto, Canada
    2010 Model here and it's quiet. I have two other Pros, a 4.1 and another 2010 and neither of them make any noise that I can hear other than the fans.
  14. Rick Green macrumors newbie

    Rick Green

    Feb 13, 2019
    Thanks for the advice. Unfortunately I don't have an UPS device or other tools to check the volts or watts. However I tried to plug the machine in different parts of the house including several wall plugs as well as extension leads and the buzz is always the same. To be honest, it's not loud at all unless I stick my ear next to the machine but if I do so I can hear it loud and clear that's why I'm wondering wether it's a common thing or not.
  15. h9826790 macrumors G4


    Apr 3, 2014
    Hong Kong
    220V or 110V?

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