Do Haswells Run Cooler Than Ivy Bridge?

Discussion in 'MacBook Air' started by jls095, Jun 27, 2013.

  1. macrumors newbie

    Joined:
    Jun 24, 2013
    #1
    Are the new Haswells running cooler than Ivy Bridge? What are your experiences so far?
     
  2. macrumors 6502a

    Joined:
    Oct 5, 2007
    Location:
    St. Augustine, FL
    #2
    In ULV form a resounding yes. Apparently when comparing the non-ULV variants.. they are roughly the same and I want to say i've read a few comparisons where the Haswell desktop cpus might have been running hotter than Ivy? But for sure the new ULV runs far cooler.. It seems like Intel really wanted to step it up in that area this year.
     
  3. macrumors 68030

    Steve121178

    Joined:
    Apr 13, 2010
    Location:
    Bedfordshire, UK
    #3
    Just as hot when under load.
     
  4. macrumors regular

    luisito

    Joined:
    Nov 15, 2012
    #4
    Yes. My MBA is always cool to the touch.

    Why do you think that Haswell can give a longer battery life? Let me explain! Because it uses less energy, and if it uses less energy to do a better job that Ivy, then it is not wasting energy, therefore that energy is not wasted on so much heat, no heat means cooler. (That is Haswell on a nutshell). :)

    I've been using it for around ~2 weeks and still wondering if it has a fan, I've never heard it. Take into account that I use adobe flash for youtube and have also watched a couple of 1080p movies (I know I will never get 1080p resolution, but that is a different story), have also transferred around 1 TB of info from an external HD to another (had to admit that it got a little warm).
     
  5. thread starter macrumors newbie

    Joined:
    Jun 24, 2013
    #5
    Interesting. The reason I asked was that I've seen from personal experience that Haswell desktop CPUs run hotter than comparable Ivys.
     
  6. macrumors 68040

    Joined:
    Aug 9, 2009
    Location:
    Portland, OR
    #6
    This is pretty simple. As the battery gets depleted... its stored energy is converted into heat. When the battery if fully depleted... all of the heat has been dissipated.

    Comparing a 2013 to a 2012 laptop... The battery has less than 10% higher capacity... which means that over the operating life... only 10% extra total heat will be generated. Close enough to call it parity.

    The operating life is approaching 2X as long... the time over which that heat is dissipated.

    So... approximately the same capacity... operating over approximately twice the time... by definition... it can only be dissipating (on average) about 50% of the heat.

    Derate that a bit... and call it 60% if you like... but there is no physical way that it cannot be running cooler over the life of a battery charge.

    /Jim
     
  7. thread starter macrumors newbie

    Joined:
    Jun 24, 2013
    #7

    I'm not sure how this is relevant to CPU temperature?
     
  8. macrumors regular

    Joined:
    Jul 13, 2012
    #8
    Short version:

    Haswell uses less power than Ivy to do the same amount of processing.

    Lower power use = lower temperature & longer battery life.

    All other things being equal.
     
  9. thread starter macrumors newbie

    Joined:
    Jun 24, 2013
    #9
    Ah I see. Got it
     
  10. macrumors 6502

    Joined:
    May 27, 2013
    #10
    Desktops'll run hotter because Iris is considerably more powerful than the equivalent IB 4000. As for ULV, they run about the same if not cooler.
     
  11. macrumors member

    Joined:
    Jun 16, 2011
    Location:
    Belfast
    #11
    is this a real question offcourse they are i have had my macbook for 2 weeks now and the fan has not came on yet and i get 12 hours plus battery outta it, it is never warm. i5/4/128
     

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