MDD 1.67 infos plz

Discussion in 'PowerPC Macs' started by Nova77, Oct 15, 2012.

  1. Nova77 Guest

    May 12, 2011
    I'd like to know if I can push my MDD from 1.58 to 1.67 ghz but I would not do it if it makes it too hot to my taste. My MDD is air cooled, it has a 80 mm fan instead of the speaker, a grid instead of the "air intake mirror", and 2 60 mm fans behind the CPU heatsink.

    If someone has an aircooled MDD, I would really like to know what his max CPU temperature is and what cooling mods he is using.
  2. Zotaccian macrumors 6502a


    Apr 25, 2012
    Just curious to know, do you have 1.25GHz MDD which you have overclocked or is it actually the FW800 1.42GHz model like what I have? I have also been thinking about overclocking this thing, I know it will not "make it fly" but anyways.
  3. GermanyChris macrumors 601


    Jul 3, 2011
    Is there a place for a rad and reservoir in an MDD??
  4. Nova77, Oct 15, 2012
    Last edited: Oct 15, 2012

    Nova77 thread starter Guest

    May 12, 2011
    I have the 1.42 ghz model @ 1.58 ghz, running at core voltage 1.70. It is 100% stable and it is actually cooler at 100% cpu load than stock config (thanks to the cooling mods). One thing I discovered by mesuring min and max temperatures (using CHUD tools' nap mode) is that the min temperature stays the same after overclocking even though the max temp goes up.

    Note: What I mean by max temperature is the temperature you get when running at full CPU load until the heat cannot rise up more than that. Min temperature is the lowest temperature you get when leaving the computer running but not performing any task. If you guys are interested I could post the numbers but I got to put back the plastic panels first to give accurate results.
  5. MaxHeap macrumors member


    Mar 28, 2012
    Aren't the 1.42 just technically overclocked 1.25s? Is it worth overclocking a 1.25 performance wise?
  6. Nova77 thread starter Guest

    May 12, 2011
    Both 1.25 and 1.42 CPUs are 7455B, so yes, they are technically the same. I think they took the better ones after testing to clock at 1.42. They are also on slightly different daughtercards.

    You can overclock yours to 1.5 ghz without problem, lots of people have reported this working 100% stable. Depending on your setup, it might be a big upgrade. I saw a big difference between 1.42 and 1.58 (+160 mhz). Maybe its just me but I feel like my graphics card is a lot less bottlenecked than before. So I bet going from 1.25 to 1.5 (+250 mhz on each CPU) is worth it. I strongly suggest you get the copper heatsink from the FW800 model though.

    ... and install CHUD tools + turn on nap mode.

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