Change the LCS in a G5 Quad?

Discussion in 'PowerPC Macs' started by iModFrenzy, Mar 14, 2015.

  1. iModFrenzy macrumors 6502a

    iModFrenzy

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    #1
    I have heard that the G5 Quad LCS is unreliable, since they are about 9 years old. I was wondering if it would be possible to use a Corsair H100 or something for the LCS in the Quad. I don't own a quad so I am not sure how they put the cooling on. Just curious if I ever pick one up.:)
     
  2. ctmpkmlec4 macrumors 6502

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    #2
    If you're skilled enough, I'm sure it's possible. I imagine you'd have to fabricate a few parts that might require access to special tools.
     
  3. MagicBoy macrumors 68040

    MagicBoy

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    #3
    In principle I can't see why it mechanically wouldn't work with the correct adaptor to mount the CPU block. It's self contained and manages the pump/fan speeds itself.

    I run an H100 in my gaming PC - it's very quiet and efficient.
     
  4. dustinschings macrumors 6502

    dustinschings

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    #4
    So, hate to wake the dead, but has anyone got a different liquid cooling solution in their Quad yet? I have a single pump Delphi model in my Quad but the fans are loud all the time and both CPUs fail thermal calibration for overheat. Still boots and works though, but I have not put it to any real work to push it.
     
  5. AphoticD macrumors 68000

    AphoticD

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    #5
    I seem to be stating this regularly, but if your G5’s cooling system isn’t as effective as it once was, it’s time to renew the thermal paste, LCS or not.
     
  6. MacSoftware3 macrumors member

    MacSoftware3

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    Jun 26, 2017
    #6
    I have exactly the same problem, can't calibrate the fans because of CPU overheat. I need to replace the thermal paste, I hope I get around to do it next week.
     
  7. reukiodo macrumors regular

    reukiodo

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    #7
    Has anyone been able to replace the quad LCS with aircool-only system?
     
  8. Bubalight macrumors member

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    Apr 22, 2015
    #8
    One time I did replace both of the dual 2.5 ghz processors and the lleaky LCS with two of the dual 2.0ghz from the dual 2.0 PCIe G5, and two of the older heat sinks from a PCIx 1.8. It wasn't the cleanest build and there wasn't a good way to fully secure them but it worked fine. I since got rid of it so I can't take any pictures now but somewhere there exists an air cooled quad 2.0 G5.
    You could make another if you have the right parts from 4 donor G5s.
     
  9. reukiodo macrumors regular

    reukiodo

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    #9
    Was it possible to use both dual 2.5 CPUs? Or was it a must to switch to the dual 2.0 CPUs?
     
  10. Bubalight macrumors member

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    Apr 22, 2015
    #10
    I do not believe the smaller heat sinks would provide adequate cooling power for the dual 2.5 Ghz, possibly not even with the fans running at max. and certainly not in the summer time or anything outside of a refrigerator. But I didn't try.
     
  11. cernorama macrumors newbie

    cernorama

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    #11

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