1,4GHz Haswell vs 2,5GHz Ivy - Explain to me

Discussion in 'Mac mini' started by rainydays, Oct 24, 2014.

  1. rainydays macrumors 6502a

    Joined:
    Nov 6, 2006
    #1
    I was surprised to see the 1,4GHz Haswell do about as well as the 2,5GHz Ivy in the geekbench scores. I haven't been updating myself in the world of CPUs for a long time, but I suspect this has mostly to do with the 1,4GHz being able to turbo boost to 2,7GHz?

    But how does that translate to real world usage? If a 1,4GHz CPU can perform as well as a 2,7GHz CPU then why isn't it marketed as a 2,7GHz CPU?
    What is the downside to turbo boosting compared to a higher base frequency?
     
  2. cinealta macrumors 6502

    Joined:
    Dec 9, 2012
    #2
    It's a temporary clock speed and can't be sustained. Thermal override will throttle it back down to 1.4 unlike a CPU designed to be run at a higher baseline constantly.
     
  3. RockSpider macrumors 6502a

    Joined:
    Sep 18, 2014
    #3
    The best way to find out which is fastest is to convert a BluRay movie into an MP4 or MKV, I'm pretty sure the 2.5ghz Ivy will win hands down.
     
  4. theSeb macrumors 604

    theSeb

    Joined:
    Aug 10, 2010
    Location:
    Poole, England
    #4
    I agree with you, in theory. Another theory would be that since the 1.4 has a lower TDP, it should be able to sustain turbo boost for much longer without thermal throttling. In theory, communism works.

    Therefore I would hold off making any absolute conclusions, until we see some concrete benchmarks and conclusive proof of the thermal efficiency. Geekbench is not a good indicator, because it never stresses a CPU for throttling to become an issue.
     
  5. Osamede macrumors 6502a

    Joined:
    Oct 28, 2009
    #5
    "TDP" that Intel offers as a spec seems to be a somewhat vaguely determined measure in reality.
     
  6. Lefty21 macrumors regular

    Joined:
    Aug 6, 2012
    Location:
    Lexington, KY
    #6
    Great, now this thread will be in the political forum before we know it... /s
     
  7. rainydays thread starter macrumors 6502a

    Joined:
    Nov 6, 2006
    #7
    Well, that's true if converting movies is the only thing you do.
    I'm more interested in how it compares in applications such as image editing and music production. As I understand it turbo boost also works differently depending on how well the application supports threading.

    ----------

    That's what I'm thinking too. The Mini should be able to keep a CPU like this cool enough for it to go on turbo boost all the time, effectively making it a 2.7GHz CPU.
     

Share This Page