21 inch vs 27 regarding heat

Discussion in 'iMac' started by onthecouchagain, Jan 27, 2012.

  1. onthecouchagain macrumors 604


    Mar 29, 2011
    Is there a difference, small or significant, in how the two models handle or dissipate heat? In other words, just cause the 27 inch is larger, presumably, there's more room/space inside? Does this allow more air flow, better venting, as oppose to the smaller 21 inch? Using this line of thought, the 21 would therefore be more crammed together and have less airflow?

    Or is there like zero difference?

    I ask because I was using a 27 inch at work today for a special job, and running videos on it all day, basically, and it felt like the back never got very hot.
  2. miles01110 macrumors Core


    Jul 24, 2006
    The Ivory Tower (I'm not coming down)
  3. SR20DETDOG macrumors regular

    Jan 25, 2011
    Queensland Australia
    That doesn't really answer the question though.

    I don't think the difference would be particularly great. While the 21.5" iMac is more compact and cramped it also uses a lower wattage CPU and less powerful GPU. There is a thread around here somewhere where members posted up their temps while under load for both the 21.5" and 27" iMacs which would answer your question but I can't seem to find it.
  4. NutsNGum macrumors 68030


    Jul 30, 2010
    Glasgow, Scotland
    Maybe best having a look at teardowns on ifixit.

    That'll show you physically whether there is any real difference.
  5. onthecouchagain thread starter macrumors 604


    Mar 29, 2011
    I actually did, and it looks like there's very little difference. Checking the measurements, in terms of height and length, the 27 is only about 5 inches longer, and 3 inches higher. I guess that doesn't allow for that much extra room, which is why I came and posted the question.

    Thanks for the replies. If anybody knows more, please chime in.
  6. derbothaus macrumors 601


    Jul 17, 2010
    Most likely a wash. The faster upgrades for each form factor will be slightly hotter. So hard to tell because of all the Intel CPU throttling as well. Depends on what you do. But they should list an idle temp at least.

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