Pegasos G4 temperature
  • Priest of the Order of the Butterfly
    Priest of the Order of the Butterfly
    Cego
    Posts: 712 from 2006/5/28
    From: Germany
    Hi there!

    I want to change the passive cooler in my Pegasos G4/1GHz. Can somebody tell me the operational temperature of the G4?
    What is the max temp allowed?

    Thanks!
    Pegasos II G4 @1.0GHz, 1GB DDR Ram, Radeon 9200Pro, 240GB SSD+160GB HD, MorphOS 3.18, AmigaOS4.1 FE, Debian 8
  • »10.10.23 - 21:08
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  • MorphOS Developer
    jacadcaps
    Posts: 2971 from 2003/3/5
    From: Canada
    R.I.P. G4. :)

    But honestly, unless you can make it operate below 85C, don't do it. Even better, aim for 75C. While those CPUs can operate hotter, the hotter it gets, the shorter its lifespan (and mind that it's already past it's intended life span).
  • »10.10.23 - 21:16
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  • Priest of the Order of the Butterfly
    Priest of the Order of the Butterfly
    Cego
    Posts: 712 from 2006/5/28
    From: Germany
    It is running at 50-60 °C at 100% CPU load
    Pegasos II G4 @1.0GHz, 1GB DDR Ram, Radeon 9200Pro, 240GB SSD+160GB HD, MorphOS 3.18, AmigaOS4.1 FE, Debian 8
  • »10.10.23 - 21:38
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  • Order of the Butterfly
    Order of the Butterfly
    sailor
    Posts: 358 from 2019/5/9
    From: Central Bohemi...
    @Cego

    you have to know exact CPU type code to know real maximal temperature. I.e. MC7447-RX1000LC ( "L" in this exact case means 1.3V / 105°C, but in other codes can has other meaning ).
    Be careful, maximal G4 on-die temperatures very varies, most common are 85-105°C, but there are also 65°C versions.

    Generally, I made many CPU swaps and overclocking, and good value for long CPU life is upto 45°C on CPU die ( i.e. cca 35-40°C on base of cooler) with 100% CPU load - this is my recomendation.



    [ Edited by sailor 11.10.2023 - 09:37 ]
    AmigaOS3: Amiga 1200
    AmigaOS4: Micro A1-C, AmigaOne XE, Pegasos II, Sam440ep, Sam440ep-flex, AmigaOneX1000
    MorphOS: Efika 5200b, Pegasos I, Pegasos II, Powerbook G4, Mac Mini, iMac G5, Powermac G5 Quad
  • »11.10.23 - 08:19
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  • Just looking around
    Stano
    Posts: 7 from 2022/5/2
    Quote:

    Cego wrote:
    ...
    I want to change the passive cooler in my Pegasos G4/1GHz. ...



    BTW: Have you seen how Sailor did her upgrade of Peg2 (including CPU cooler)?
  • »19.10.23 - 16:29
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  • Just looking around
    Posts: 9 from 2022/4/20
    Quote:

    Cego wrote:
    Hi there!

    I want to change the passive cooler in my Pegasos G4/1GHz. Can somebody tell me the operational temperature of the G4?
    What is the max temp allowed?

    Thanks!


    My old AmigaOne XE G4 1Ghz did 50º-75º with the original fan and heatsink,
    I changed it to a Zalman copper cooler/fan combo and got it down to 30º idle,
    and according to the new owner of the XE he's getting 37º under heavy CPU load.
  • »01.11.23 - 11:18
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  • MorphOS Developer
    geit
    Posts: 1031 from 2004/9/23
    Quote:

    jacadcaps wrote:
    R.I.P. G4. :)

    But honestly, unless you can make it operate below 85C, don't do it. Even better, aim for 75C. While those CPUs can operate hotter, the hotter it gets, the shorter its lifespan (and mind that it's already past it's intended life span).


    I had a passive cooled G4 for about 10 years. It was a mod, made by AKnabe, and worked completely silent. I returned the CPU board a few years ago as I did not require the additional CPU power anymore, as I replaced it with a PowerMac. I reinstalled the original G3.

    So it is possible to create a passive cooled system, but you should know what you are doing. It was a stock board and not overclocked.

    The cooler was massive and the CPU board had an additional support structure to not bend/break the slot on the board itself. Breaking just the CPU board is more expensive than a "new" Mac. Breaking all together is a disaster.

    I would still replace it with a different system. Remember a PowerMac 933Mhz is still faster than the Pegasos2 due to RAM Speed.

    [ Edited by geit 01.11.2023 - 15:52 ]
  • »01.11.23 - 15:51
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  • Priest of the Order of the Butterfly
    Priest of the Order of the Butterfly
    Cego
    Posts: 712 from 2006/5/28
    From: Germany
    I like the idea of having a dedicated custom system for MorphOS. The old Macs maybe faster, but a Pegasos inside a nice looking MicroATX case is much more appealing to me. The only option to replace my Peg2 would be a X5000, but that one is too expensive.

    On Topic:

    I have now replaced the cooler of the G4 with a bigger copper heatsink and a faster (and noisier) fan.
    Temperature dropped around 5°C in full cpu load.
    Pegasos II G4 @1.0GHz, 1GB DDR Ram, Radeon 9200Pro, 240GB SSD+160GB HD, MorphOS 3.18, AmigaOS4.1 FE, Debian 8
  • »01.11.23 - 16:25
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