MDD Main Fan Replacement

Discussion in 'PowerPC Macs' started by MatthewLTL, Feb 19, 2015.

  1. MatthewLTL macrumors 68000

    MatthewLTL

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    #1
  2. harrymatic macrumors 6502

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    #2
    Thinner fans work fine. I tried a 120mm Fractal Designs fan in my system but it didn't shift enough air to keep the CPU cool enough for my liking.
     
  3. MatthewLTL thread starter macrumors 68000

    MatthewLTL

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    #3
    Cool. Thanks. I plan on getting 7 60 X 60 X 15 fans, 2 for the front, 2 for the rear 2 for the PSU and one for the ODD side fan.

    I may get more precise fan sizes as the Rear can use 70mm Fans (Using one now, I doubt an 80mm fan would work though i have plenty of those around to try 'em) The front CAN fit 60mm fans but it seems easier to install 50mm in the front. I could also fit 50mm in the rear (in front of the rear HDD cage) however i have not tried doing that yet and do not know if it would make a difference.

    The side fan on a MDD is rather pointless don't seem to help anything but if one wanted to get a quieter on (which it isn't loud unless running on 12V) it needs to be a 60 x 60 x 10mm fan (Not sure if the 15mm one i will get will allow the door to close)

    However all of these fans are low priority. The system doesn't Overheat but runs hotter than I would like. If i run the main 120mm fan on 12V it sounds like a jet engine but DOES eliminate the need for any additional fans at all
     
  4. Goftrey macrumors 68000

    Goftrey

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    #5
  5. MatthewLTL thread starter macrumors 68000

    MatthewLTL

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    #6
    so 95CFM or higher?
     
  6. poiihy macrumors 68020

    poiihy

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    #7
    What's the CFM of the stock fan? Is the MDD fan the same as the DA fan?
     
  7. Goftrey macrumors 68000

    Goftrey

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    #8
    Definitely. The stock fan is rated at 108CFM FYI.


    I'm not familiar with DA's so I don't know.

     
  8. MatthewLTL thread starter macrumors 68000

    MatthewLTL

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    #9
    no idea but it is STRONG. you run that thing at 12V you could feel it across a medium sized room! The MDD runs at about 80F when the fan is running full bore. Not to mention the thing is SO Loud you if you lived in a 2 bedroom apartment you would hear it thoughout the entire apartment no joke!

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    is that 108CFM at 12V?
     
  9. poiihy macrumors 68020

    poiihy

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    #10
    :eek: wow
    Are they sleeve bearing or ball bearing?
    I'm interested in replacing the fans in my DA as they are noisy too
     
  10. Goftrey macrumors 68000

    Goftrey

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    #11
    Haha yes it is ;)
     
  11. MatthewLTL thread starter macrumors 68000

    MatthewLTL

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    #12
    I've always preferred ball bearing myself they seem to be higher CFM and better airflow than sleeve but today there are fans with atleast a dozen different types of bearings, assuming the DA uses a 120mm fan ANY kind of 120mm fan should work.

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    what is the dBs?
     
  12. poiihy macrumors 68020

    poiihy

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    #13
    I mean the stock fans in the G4, are the stock fans sleeve or ball?
     
  13. MatthewLTL thread starter macrumors 68000

    MatthewLTL

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    #14
    based on the Airflow and the noise i would say ball. You can look at the label on the fan it usually says
     
  14. poiihy macrumors 68020

    poiihy

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    #15
    are there ways to make the fans quieter without replacing them? Oil? Rubber spacers?
     
  15. MatthewLTL thread starter macrumors 68000

    MatthewLTL

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    #16
    Yes. Two of the easiest ways are a PC fan controller OR run the fans at a lower voltage by tapping into the PSU. With apple using 90 degree Molex plugs this is simple. Pop the cap off the plug and place the bare fan wires on the red and black for 5V or red and yellow for 7V, pop the cap back on and you're good to go.
     
  16. poiihy macrumors 68020

    poiihy

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    #17
    What voltage do the fans originally run at? Will running the fans slower cause heat problems (with older G4s like 466MHz)?
     
  17. eyoungren macrumors P6

    eyoungren

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    #18
    I'm using a Cooler Master JetFlo 120mm fan for the case fan. 95CFM

    This…the bGears BG01213 (120mm) is the one I use on the bottom 110CFM.
    [​IMG]
     
  18. MatthewLTL thread starter macrumors 68000

    MatthewLTL

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    #19
    How loud is the 110CFM running at 12V? also do they have it in red?
     
  19. eyoungren, Feb 20, 2015
    Last edited: Feb 20, 2015

    eyoungren macrumors P6

    eyoungren

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    #20
    Well…It depends on you I guess. For me it's not very loud. I've also replaced the PSU fan with a Bgears b-Blaster 80mm fan which does 62cfm. So, these fans and the HD Cooler fans combined probably are louder than stock, but I wouldn't say by much.
    [​IMG]
    As to if they have the 120mm fan in red, yes, they do. It comes in a few colors I believe. Different model number, though, just looked it up. Here's one from Fry's Electronics…
     
  20. poiihy, Feb 20, 2015
    Last edited: Feb 20, 2015

    poiihy macrumors 68020

    poiihy

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    #21
    :D red fan cool
    I think red is better because it doesn't hurt your eyes.
    There are also green and purple fans and even RGB fans
    You can have fans of any color, you can replace the LEDs yourself !
    Just look at all these fans :D

    Those fans have many small blades vs the typical fan which has fewer but larger blades. What's the pros and cons?


    You talk about the more expensive fans, but how does the really cheap ones on ebay compare? Like this one? It is a popular cheap color fan but only 38.4 CFM. Have you ever got any of these? They look cheap. Also there is this one which is about $5 per fan and push 66.2 CFM. How do they compare to the average PC fan in some Dell or HP pc?

    Oh I just found out, it seems that fans in-stores like Best buy and Walmart and Fry's are cheaper than buying online! You bought a fan for $4 and I think you said it was good.
     
  21. desantii macrumors 6502

    desantii

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  22. MatthewLTL thread starter macrumors 68000

    MatthewLTL

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    #23
  23. desantii macrumors 6502

    desantii

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    #24
    I wedged it in the PCI area.. Just some extra cooling
     
  24. MatthewLTL thread starter macrumors 68000

    MatthewLTL

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    #25
    you could faness it behind the CPU heatsink 1 80mm just BARELY fits there
     

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