Would this fan work?

Discussion in 'PowerPC Macs' started by MisterKeeks, Jun 13, 2013.

  1. MisterKeeks macrumors 68000

    MisterKeeks

    Joined:
    Nov 15, 2012
    #1
    I have a chance to buy a fan from this watercooling kit for use in a MDD dual 1.25 with the bad heatsink from craigslist. While the original fan is 108CFM, this is only 92. It appears to have a 3-pin connector but only 2 wires.
     
  2. 666sheep macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #2
    It will work. But from the pics it's clearly 3 pin 3 wire fan. Just use 2 of them with standard MDD 2 pin connector.
    One question: are you sure that your 1.25 DP has stock 120 mm fan?
    IIRC 108 CFM one (Papst) was used in SP and lower clocked DP (867 and maybe 1.0 - not sure here). 1.25 DP should have 149 CFM Delta AFB1212VHE or SHE. All my 1.42 DPs have SHE IIRC.
     
  3. MisterKeeks thread starter macrumors 68000

    MisterKeeks

    Joined:
    Nov 15, 2012
    #3
    108 was the number I pulled from this page. Mine never had a system fan. Do you think that the CFM is high enough?
     
  4. 666sheep macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #4
    On japamac's site parameters are more general than specific. Few dozens MDDs passed through my hands, and I can say with certainty that they had different main fans, depending on CPU speed and count. IIRC 1.25 DP should have about 150 CFM fan.
    I'd say 92 CFM won't be enough for 1.25 DP on full load, especially if it's 2MB L3 one. NAP helps, but mostly when idle.
    On the other hand, fans are software controlled, unlike in previous PMs. There is a kext in OS X with fan speed values corresponding to CPU thermal sensor reads. You can edit this kext according to new thermal management.
     
  5. Cox Orange macrumors 68000

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    Jan 1, 2010
    #5
  6. 666sheep macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #6
    It reads thermal sensor on CPU daughtercard. It's small 5-leg, rectangle chip placed between cache chips on CPUs side. On 1.42 DP card I have in the hand now it's marked U18 (on PCB).
     
  7. Cox Orange macrumors 68000

    Joined:
    Jan 1, 2010

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