09 Mac Pro power supply at 75º Celsius

Discussion in 'Mac Pro' started by Cynicalone, Dec 4, 2009.

  1. Cynicalone macrumors 68040

    Cynicalone

    Joined:
    Jul 9, 2008
    Location:
    Okie land
    #1
    I woke up this morning started going threw my emails, and listening to a couple of podcasts. Took a look at iStat and found the power supply at 75º C. This seems exceedingly high. This is the list of all the apps I have open this morning...
    • Safari
    • iTunes
    • last.fm
    • Mail
    • iChat
    • Address Book
    Absolutely nothing processor intensive on that list. Is anyone else see's numbers like this from their power supplies? Maybe I haven't been paying attention and the iTunes/QT bug is also stressing the Power Supply?
     

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  2. alphaod macrumors Core

    alphaod

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    Feb 9, 2008
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    NYC
    #2
    Can you check to see if the fan is physically working properly and nothing is obstructed? Maybe shine a flashlight in and check to see dust has accumulated?
     
  3. Cynicalone thread starter macrumors 68040

    Cynicalone

    Joined:
    Jul 9, 2008
    Location:
    Okie land
    #3
    Fans appear to be fine. I'm going to quit iTunes and see if it drops off, then I'll know if it is just part of the iTunes/QT bug. If it doesn't drop off then I'll open it up take a look at the dust inside.
     

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  4. alphaod macrumors Core

    alphaod

    Joined:
    Feb 9, 2008
    Location:
    NYC
    #4
    I'm not sure… I don't seem to have the iTunes/Quicktime bug. Currently iTunes is on and I've just finished encoding a video.

    FWIW here's a screenshot of mine…

    Just curious… do you have dual optical drives by any chance?

    I can only think of obstruction, a fail fan, or a broken thermal sensor.

    [​IMG]
     
  5. Cynicalone thread starter macrumors 68040

    Cynicalone

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    #5
    Yes two optical drives.

    After 20 mintues without iTunes I'm down to 60º Celsius. So it must be the QT/iTunes bug.
     

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  6. alphaod macrumors Core

    alphaod

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    #6
    That bug must be pretty bad. :(
     
  7. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #7
    What kind of load was on the PSU at this temp?

    Assuming that not much else is running, that's high. Full load, it's acceptable, but not otherwise, as they're typically designed for a target of 55C for safety(the area alphaod's is hovering).
     
  8. Cynicalone thread starter macrumors 68040

    Cynicalone

    Joined:
    Jul 9, 2008
    Location:
    Okie land
    #8
    The same as before minus iTunes. Mail, Safari, Address Book, iChat, nothing that should load an 09 Mac Pro.

    After 1 hour it was down to 50º just idling.

    Now I have Aperture open and iTunes playing in the background and we are back up to 61º and 67º and climbing.
     
  9. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #9
    Hard to say, without other '09 system owners posting PSU temps at idle, then with iTunes (or any other app that uses Quicktime X).

    It does seem to be running hot to me though, as idle should be cooler (~45C or so ideally). The iTunes (Quicktime X) mess is odd, and it's effects on the PSU unknown. It's rather close here, given the location of the PSU (higher ambient than 25C, which is where the 45C figure is derived).

    Either way, a PSU in the upper 60's C is too hot IMO. PSU's don't use heatsinks on the regs for that high a temp, even with forced air cooling. Forced air was done to reduce the heat sink costs, as fans are cheaper than the aluminum profile needed for natural convection cooling. It's expected ambient (intake air) will be higher than 25C as well, and forced air makes more sense in this case as well.
     
  10. lannister80 macrumors 6502

    lannister80

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    Apr 7, 2009
    Location:
    Chicagoland
    #10
    Well, under super-duper full load, my 2008 MP power supply runs at 53C and 60C (two temp probes) and never goes above that (600rpm PS fan).

    Not sure how relevant that is with it being a different model, but that does seem pretty darn high,
     
  11. nanofrog macrumors G4

    Joined:
    May 6, 2008
    #11
    The PSU's in the '08's and '09's are very similar (same power rating), so it's applicable IMO (improvements in efficiency, which means the '09's should run a tad cooler for the same load :eek:).
     
  12. Rt&Dzine macrumors 6502a

    Rt&Dzine

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    Oct 8, 2008

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