G5 Temperatur Control
  • Priest of the Order of the Butterfly
    Priest of the Order of the Butterfly
    Amigaharry2
    Posts: 895 from 2010/1/6
    From: EU-Austria (Wien)
    On some of my G5 Powermacs I can see a strange behaviour of backside temperature (Northbridge).

    Under MOS a G2/2,3GHz heats up over 70°C in a short time (eg. useing Webbrowser). Normaly I limit it with CpuFanControl to 55°C (on all my G5), but in that case, fan is blowing full, most of the time. Useing OSX on the same machine, Northbridge don't reach even 48°C under same conditions (Webbrowsing) by very low fan-speed. Its a late G5 with ROM 5.24f1. The same behaviour I can see also on a G5/2.0GHz with ROM 5.18f7.
    My old (now gone) G5/2.3GHz, ROM 5.24f1 and a 1.8 GHz G5, ROM 5.15f0 does'nt do that. There temperature for Northbridge is always under 50° (MOS and OSX) at moderate fan-speed (can't really hear it)
    All other temperatures (CPU, DriveBay......) are always normal.

    What happens here?
    Peg2, 3xPowerMac G5, 2xPowerbookG4, 2x MacMiniG4, Efika (again), A3000T and life is never boring.....
  • »07.09.21 - 09:54
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  • MorphOS Developer
    jacadcaps
    Posts: 2487 from 2003/3/5
    From: Canada
    OSX likely uses different naming for sensors. Backside is actually a memory controller, at least on the PCIe G5. If that one gets to 70C, you should likely rebuild your machine and replace the thermal paste on it. It’s a common cause of issues with the G5s.
  • »08.09.21 - 00:39
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  • Yokemate of Keyboards
    Yokemate of Keyboards
    Andreas_Wolf
    Posts: 11438 from 2003/5/22
    From: Germany
    >> On some of my G5 Powermacs I can see a strange
    >> behaviour of backside temperature (Northbridge).

    > OSX likely uses different naming for sensors. Backside
    > is actually a memory controller, at least on the PCIe G5.

    Isn't northbridge ⊃ memory controller?


    Edit: corrected operator

    [ Edited by Andreas_Wolf 08.09.2021 - 15:57 ]
  • »08.09.21 - 07:01
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  • Priest of the Order of the Butterfly
    Priest of the Order of the Butterfly
    Amigaharry2
    Posts: 895 from 2010/1/6
    From: EU-Austria (Wien)
    Thank you for that hint - I'll renew thermal paste!
    Peg2, 3xPowerMac G5, 2xPowerbookG4, 2x MacMiniG4, Efika (again), A3000T and life is never boring.....
  • »08.09.21 - 08:22
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  • Order of the Butterfly
    Order of the Butterfly
    sailor
    Posts: 183 from 2019/5/9
    From: Central Bohemi...
    Quote:

    Andreas_Wolf wrote:

    Isn't Northbridge = memory controller?



    Sometimes yes. Sometimes it is:
    Northbridge = memory controller + PCIe (or AGP) graphics bridge.
    I think, that Powermac G5 PCIe is the second case.
    AmigaOS: Pegasos II, Sam440ep-flex, Micro A1-C, AmigaOneX1000
    MorphOS: Pegasos II, Powerbook G4, iMac G5, Powermac G5 Quad
  • »08.09.21 - 09:19
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  • Yokemate of Keyboards
    Yokemate of Keyboards
    Andreas_Wolf
    Posts: 11438 from 2003/5/22
    From: Germany
    >> Isn't Northbridge = memory controller?

    > Sometimes yes. Sometimes it is:
    > Northbridge = memory controller + PCIe (or AGP) graphics bridge.
    > I think, that Powermac G5 PCIe is the second case.

    I'm well aware of the overall PowerMac11,2 system architecture. Seems my use of the '=' operator was kind of sloppy and thus has you confused with regard to my question. "Northbridge memory controller" would have been the correct expression.
    So my question still stands: Doesn't the northbridge chip (if present) always contain the memory controller, so the first implies the second? Or why is there the need to dinstinguish between those with regard to the temperature sensor?
    (Btw, I don't think there were/are any northbridge chips that contain nothing but the memory controller.)
  • »08.09.21 - 12:13
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  • MorphOS Developer
    jacadcaps
    Posts: 2487 from 2003/3/5
    From: Canada
    OK, I did a little bit of googling and yes, the Apple U4 (IBM CPC945) is a north bridge/memory controller unit. It also features PCIe support and additional stuff like I2C.

    http://static6.arrow.com/aropdfconversion/86f55fc3c7ce0714ba0e1880ce7e6964ea1d4fa9/cpc945_ds_a15-6009-02.pdf
  • »08.09.21 - 14:09
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  • Order of the Butterfly
    Order of the Butterfly
    sailor
    Posts: 183 from 2019/5/9
    From: Central Bohemi...
    And here is nice diadram od G5 PCIe:

    thehouseofmoth.com
    AmigaOS: Pegasos II, Sam440ep-flex, Micro A1-C, AmigaOneX1000
    MorphOS: Pegasos II, Powerbook G4, iMac G5, Powermac G5 Quad
  • »08.09.21 - 16:07
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