lazerpouf

Q: Power Mac G5 Dual Core gets hot and fans run slow

Hello

 

I have a Power Mac G5 (Late 2005) Dual Core that has fan problems. The temperatures get high and the fans barely spin up. The CPU fans sit at 499 and 515 rpm and when playing Minecraft they go to about 600 rpm and the CPU gets up to 151F. I have ran Apple Hardware Test and it still doesn't work. It is running Mac OS 10.5 and has 6 GB of RAM and has a 500GB hard drive. I have:

  • Reset PRAM
  • Re-installed Mac OS X
  • Replaced Hard Drive
  • Cleaned dust
  • Ran AHT
  • And reset the SMU
  • Tried editing AppleFan.kext

iStat pro says the fans spin about:

CPU A intake: 499 rpm

CPU A exhaust: 515 rpm

CPU B intake: 499 rpm

CPU B exhaust: 515 rpm

Backside: 1000 rpm

Slots: 1500 rpm

drive bay: 1000 rpm

 

Is this normal? Do they always spin slow or is there any other things I can do or software to download?

PowerMac, Mac OS X (10.5)

Posted on Feb 15, 2016 4:00 PM

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Q: Power Mac G5 Dual Core gets hot and fans run slow

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  • by lazerpouf,

    lazerpouf lazerpouf Feb 18, 2016 3:08 PM in response to BDAqua
    Level 1 (0 points)
    Feb 18, 2016 3:08 PM in response to BDAqua

    There is no PowerMac11_2ThermalProfile.kext listed in System profiler, but there is a powermac_11_2_PlatformPlugin listed.

  • by lazerpouf,

    lazerpouf lazerpouf Feb 19, 2016 7:06 AM in response to lazerpouf
    Level 1 (0 points)
    Feb 19, 2016 7:06 AM in response to lazerpouf

    Can I download PowerMac11_2ThermalProfile.kext or do I need it because it is not listed or in AppleMacRISC4PE.kext

  • by BDAqua,

    BDAqua BDAqua Feb 19, 2016 9:51 AM in response to lazerpouf
    Level 10 (123,745 points)
    Feb 19, 2016 9:51 AM in response to lazerpouf

    I'm not exactly sure if it's needed for all G5 11.2s or maybe just LCS models or maybe just the Quads!?

     

    It looks like it's included in th1058 Combo Update, 10.5.8, maybe reapply that...

     

    http://support.apple.com/downloads/Mac_OS_X_10_5_8_Combo_Update

  • by lazerpouf,

    lazerpouf lazerpouf Feb 19, 2016 4:04 PM in response to BDAqua
    Level 1 (0 points)
    Feb 19, 2016 4:04 PM in response to BDAqua

    Hi

     

    I just installed the 10.5.8 combo update, The OS was originally 10.5.0

    Those fans don't spin up to very high speeds.

     

    I installed Hardware Monitor (got it to work, needed 10.5.8 update) and it says the maximum the CPU fans could go is 3200 rpm.

    Also, the Drive Bay, Slots intake and Backside fans do not spin up. They stay at the same speed.

  • by BDAqua,

    BDAqua BDAqua Feb 20, 2016 10:09 AM in response to lazerpouf
    Level 10 (123,745 points)
    Feb 20, 2016 10:09 AM in response to lazerpouf

    Is the PowerMac11_2ThermalProfile.kext there now & loaded?

  • by lazerpouf,

    lazerpouf lazerpouf Feb 20, 2016 1:11 PM in response to BDAqua
    Level 1 (0 points)
    Feb 20, 2016 1:11 PM in response to BDAqua

    Yes, PowerMac11_2_ThermalProfile version 3.4.0 is loaded and is valid and authentic.

  • by BDAqua,

    BDAqua BDAqua Feb 20, 2016 1:35 PM in response to lazerpouf
    Level 10 (123,745 points)
    Feb 20, 2016 1:35 PM in response to lazerpouf

    Maybe recalibrate the fans now that it's there?

     

    In a warm as room as you can?

  • by lazerpouf,

    lazerpouf lazerpouf Mar 5, 2016 6:07 AM in response to BDAqua
    Level 1 (0 points)
    Mar 5, 2016 6:07 AM in response to BDAqua

    Hello

     

    I recalibrated the fans on the Power Mac G5 (again after installing 10.5.8 update) and ran that program.

    I also got Hardware Monitor to work and it graphs the fan speeds.

    They spinning up, but they don't seem to go over ~800-900 rpm

  • by Drew Reece,

    Drew Reece Drew Reece Mar 5, 2016 7:32 AM in response to lazerpouf
    Level 5 (7,619 points)
    Notebooks
    Mar 5, 2016 7:32 AM in response to lazerpouf

    What was the ambient temperature when you recalibrated? How are you measuring the ambient air?

  • by lazerpouf,

    lazerpouf lazerpouf Mar 6, 2016 6:53 AM in response to Drew Reece
    Level 1 (0 points)
    Mar 6, 2016 6:53 AM in response to Drew Reece

    The room is mostly always approximately at 66-68ºf. I wasn't measuring the temperature when I recalibrated them, but it is always around 68-70ºF.

  • by Drew Reece,

    Drew Reece Drew Reece Mar 6, 2016 3:24 PM in response to lazerpouf
    Level 5 (7,619 points)
    Notebooks
    Mar 6, 2016 3:24 PM in response to lazerpouf

    That strikes me as being cool - the G5 may have difficulty overheating in a cool environment. The spec says it can run 50º to 95ºF. I'd expect the fans to run mid speed in the middle of that range which is what you are apparently seeing (72.5ºF is midway).

     

    I was hoping you would say you were measuring the temperature with a device independent to the Mac, you can't rely on the internal ambient sensor alone as it can warm up above room temperature (since it is enclosed in the G5 case).

     

    The ASD disk also has tests for the hardware, it should be able to test the fans. See if that reports anything.

     

    To be honest I'm at a loss and I can't access the temperature data from the G5, sorry. You can have the hardware monitor data to see if you can read it. Marcel Bresink says it can only be read when the same sensors are on the Mac. You may need to set your clock to October 2009 to view the readings (replace your existing data at ~/Library/Application Support/Hardware Monitor/). I don't know what is contained in those files, they are from a Dual 2.3 PowerMac7,2 if I recall correctly.

    https://dl.dropboxusercontent.com/u/59660/HW%20Monitor%20Archive.zip

     

    If you want to be brutal you could max out the CPU & GPU whilst impeding the airflow into the G5. Eventually it will shut itself down (or crash) but you should see the fans speed up! I have used an electric fan heater to blow hot air at a device to provoke temperature related issues in the past, sometimes you have to improvise to see if it will ever overheat. It's a good idea to measure the incoming temp with another device.

     

    See if BDAqua has any better ideas, my concern is that you are assuming the temps are high based on readings from a model that has a different cooling system.

  • by lazerpouf,

    lazerpouf lazerpouf Apr 19, 2016 12:35 PM in response to Drew Reece
    Level 1 (0 points)
    Apr 19, 2016 12:35 PM in response to Drew Reece

    Hello


    The room temperature is 65`f. I have ran the ASD disk many times but it says that everything is ok. I also can't access the temperature data even though I set the clock to October 12, 2009 at 10:20. Where it says "Now" on the history graph, it just starts recording the current data from my G5.

  • by Drew Reece,

    Drew Reece Drew Reece Apr 26, 2016 12:04 PM in response to lazerpouf
    Level 5 (7,619 points)
    Notebooks
    Apr 26, 2016 12:04 PM in response to lazerpouf

    Sorry, that was a long shot so you could see older data. I asked Marcel Bresink how to read the data but it seems impossible, the G5 died eons ago. I don't understand the data format or why reading it is hardware specific.

     

    I'm not sure what to suggest, you have an old Mac that is still working, the temperature readings look OK to me. I'm not sure that it is wise to compare to a liquid cooled model. I'd get everything hot (including room temp) & see if it ever keels over with everything running under full load for an hour. It should shutdown when it gets too hot as defined in the operating temps.

    Are you only measuring the temps via the built in sensors? You really need to use a second thermometer for room temp.

     

    I suppose if you are worried you can strap a couple large fans outside the case to keep air moving, but I don't know anyone who wanted more fan noise from a G5. Apple lauded over it's airflow design & thermal zones when it was released, maybe it is working as designed?

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