Noisy Fan replacement in G4 MMD?

Discussion in 'PowerPC Macs' started by Retrosonic, Jan 10, 2011.

  1. macrumors regular

    Joined:
    May 13, 2009
    #1
    Guys, I have a great G4 MMD machine that I love. I've rebuilt it, and it does everything I want it to do with OSX.

    The problem is the noise from the two fans. Its REALLY loud.

    Is there a drop in replacement for the big fan that will be less loud, BUT will still move the same amount of air. The last thing I want to do is overheat the machine because I put in a substandard fan.

    Any help is appreciated!

    thanks,
    Retro
     
  2. cocacolakid, Jan 10, 2011
    Last edited: Jan 10, 2011

    macrumors 65816

    cocacolakid

    Joined:
    Dec 18, 2010
    Location:
    Chicago
    #2
    Search around the site here for more info, but the fan everyone seems to recommend is a SilenX 120x120x38mm, it's 90cfm (make sure that's the one you get, they also make a 60cfm now but that doesn't move enough air for your rig).

    Here's the link:

    http://www.frozencpu.com/products/4274/fan-235/SilenX_120x120x38mm_-_18dBA_-_90CFM_iXtrema_Pro_Fan_IXP-76-18.html

    This guy talks about quieting his MDD, and used that fan. In the comments a couple of people discuss which pins on the motherboard to connect to the 3 pin fan connector from the SilenX. http://coolstuff.wordpress.com/2007/02/19/powermac-g4-mdd-cooling-and-noise-reduction/
     
  3. Dave H, Jan 10, 2011
    Last edited: Jan 11, 2011

    macrumors 6502

    Dave H

    Joined:
    Mar 2, 2008
    Location:
    California
    #3
    If I am not mistaken, the original main fan is rated 152 CFM, and 53dBA.
    This one is rated 133 CFM and 46dBA.

    This one moves 110 CFM, but it's 25mm thick instead of 38.

    I used to have a Silenx 90CFM fan in my G4 DA, but I replaced it. I really doubt its airflow rating, and it was noisy.
     
  4. macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #4
  5. thread starter macrumors regular

    Joined:
    May 13, 2009
    #5
    Thanks!

    Wow, guys, thanks for the info.

    I did do some reading on this topic, and it seems like that replacement for the big fan doesnt move enough air. Mine is a dual 1gz machine and that processor gets mighty hot. I'm not going to risk frying it.

    Anyone know if there is a whole new power supply i could buy that has the less noisy fans?

    many thanks,
    Retro
     
  6. AlexMaximus, Jan 13, 2011
    Last edited: Jan 13, 2011

    macrumors 6502

    AlexMaximus

    Joined:
    Aug 15, 2006
    Location:
    Boondocks
    #6
    G4 PSU conversion to ATX

    ...see reply below...
     
  7. AlexMaximus, Jan 13, 2011
    Last edited: Jan 13, 2011

    macrumors 6502

    AlexMaximus

    Joined:
    Aug 15, 2006
    Location:
    Boondocks
    #7
    G4 PSU conversion to ATX


    Make sure you check out those pages regarding G4 MDD to ATX PSU conversion:

    http://www.applefritter.com/node/23857

    and some nice YouTube step by step courses here:


    http://www.youtube.com/watch?v=xICg592xJTg

    http://www.youtube.com/watch?v=wEzbl3eJIro

    Regarding low noise fan upgrades for the G4, here is still a set available in Europe you might be interested in:

    http://www.pcsilent.de/en_pd_Smartc...-Macintosh-G4-quiet-powermac-LFS1130_937.html

    Also read this here:

    http://bitsandpieces.info/MDDG4CoolingMod.htm

    More about CHUD here:

    http://www.xlr8yourmac.com/feedback/MDD_CHUD_feedback.html#storytop


    good luck

    :apple:
     
  8. thread starter macrumors regular

    Joined:
    May 13, 2009
    #8
    Thanks!!

    Thank you!! Looks like I have my work cut out for me.

    Will be great when its all done tho. The machine rocks, its just the noise thats a problem.

    thanks again!
     

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