PowerMac G5 getting a little toasty

Discussion in 'PowerPC Macs' started by CountMaxMore, Apr 19, 2015.

  1. CountMaxMore macrumors member

    CountMaxMore

    Joined:
    Dec 18, 2014
    #1
    Pretty much exactly what the title says the fans seem to keep a idle on and don't go violent at all is there a fix to this?
     

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  2. bunnspecial macrumors 603

    bunnspecial

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    May 3, 2014
    Location:
    Kentucky
    #2
    I haven't monitored my G5 that closely, but that's about what I get out of my Xserve(dual 2.0) in a few minutes under moderate to heavy sustained loads(it idles at about 100-110ºF depending on the ambient room temperature). I typically see 145º under load when the room is warm, which is a bit cooler than you're seeing but not by a huge amount.

    A repaste would probably bring your temperatures down a bit.

    BTW, I've noticed both in G5 towers and in my Xserve, CPU A always seems to run a bit hotter than CPU B. Even though OS X does a decent job of splitting the load between processors, I suspect that CPU A still gets more use. I notice even on my dual core that Core A runs a bit warmer than Core B, although they are a bit closer in temperature.
     
  3. CountMaxMore thread starter macrumors member

    CountMaxMore

    Joined:
    Dec 18, 2014
    #3
    Okay I will give it a re paste later on tonight ~Thanks:)
     
  4. ptdebate macrumors 6502

    ptdebate

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    Dallas, Texas
    #4
    Which G5 is it? Those temperatures look fine to me but I'm running the hottest G5 there is (2.7 DP).
     
  5. CountMaxMore thread starter macrumors member

    CountMaxMore

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    Dec 18, 2014
    #5
    Here yeah go
     

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  6. MacCubed macrumors 68000

    MacCubed

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    Apr 26, 2014
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    Florida
    #6
    Yeah, my fans kick on at random times, even when I'm not doing much. Then after 30 secs the fans' RPM and the temps go down.
     
  7. eyoungren macrumors P6

    eyoungren

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    Aug 31, 2011
    Location:
    Phoenix • 85037
    #7
    I averaged about 128º (Fahrenheit) at idle when I used our single processor G5 at work. The iMac G5 I have at home idles around 135º.

    Based on the little I can see, your processors are busy so I'm not surprised that the heat is up there a bit. I've seen your temps on the work G5 and the iMac at home has pushed 160º.

    So your temp of 145º (apx) under load is normal. The G5 just runs hotter than anything else (except, as I am discovering, the Intels).
     
  8. bunnspecial macrumors 603

    bunnspecial

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    #8
    Most recently, when I ran CPU test overnight on my Xserve, CPU A peaked at 145º, I think. That's with the CPUs repasted with AS5. I think it should be cured by now, but one of my reasons for running CPUTest was to get the temps up and help cure it.

    Xserves and G5 towers can't exactly be compared side by side, as their cooling design is quite different and noise is less of a concern on the Xserve(an idling Xserve is a fair bit louder than an idling tower, although not as loud as a tower with all the fans blasting). In any case, though, my Xserve is in a closet with no HVAC ducting in it. The house is fairly well insulated, but the closet still has an outside wall and the temperature tends to track with the outside temperature. With it 0ºF outside, the closet is 55-60º, while in the summer it can get up to 80ºF in that closet. With the closet at 60º, my full load temperature on CPU A was about 132-133ºF(after repasting), and with the closet at 75º the temperature got up to 145º or so.

    Again, that's load temperature. With the closet "cool" I was seeing idle temperatures of around 100ºF, and with it now "warm" I'm seeing them up around 105º.
     
  9. gavinstubbs09 macrumors 65816

    gavinstubbs09

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    #9
    My 2005 2.3DP runs about 145*F on idle. My 2.7 was in the 170s!
     
  10. noodle654 macrumors 68020

    noodle654

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    #10
  11. davidg4781 macrumors 68000

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    Oct 28, 2006
    Location:
    Alice, TX
    #11
    Just want to make sure on this, when reapplying thermal paste, the PMG5 needs to be recalibrated with that special disc, right?

    I just want to make sure I have that disc and it works before I start cleaning inside up.
     
  12. bunnspecial macrumors 603

    bunnspecial

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    Kentucky
    #12
    I've never done a recalibration when replacing thermal paste.
     
  13. Altemose macrumors G3

    Altemose

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    Mar 26, 2013
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    Elkton, Maryland
    #13
    Generally, you will need to recalibrate the cooling system whenever the CPU is removed. This calibration must be done by Apple Service Diagnostics, an Apple tool that was never made available to the public.

    Strange. I have had CPUs out of two G5s and both required recalibration following the repairs.
     
  14. mikiotty macrumors 6502

    mikiotty

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    Mar 15, 2014
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    Rome, Italy
    #14
    Actually, based on my personal experience, if you reinstall the CPUs in the exact order as they were before taking them out (upper CPU in the first socket, lower CPU in the second socket) you shouldn't need to recalibrate the processors. If you replace/reorder the CPUs you'll need to recalibrate them, at least with the June 2004 Dual 2.0 G5.
     
  15. Altemose macrumors G3

    Altemose

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    Mar 26, 2013
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    Elkton, Maryland
    #15
    That is an interesting observation and I suppose that is how the computer knows that a CPU has been removed.
     

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