Any real difference between 2.9/3.1/3.3 ghz?

Discussion in 'MacBook Pro' started by Lisdexic, Oct 27, 2016.

  1. Lisdexic macrumors newbie

    Joined:
    Mar 27, 2016
    #1
    I'm planning on getting the 13" model with touch menu. I need the additional ram but I don't understand cpu speeds that well. I build machine learning and ai models on my computer so I generally cap out any resources I do have. The ram requirements usually spike as I load data in but subside a bit later so I definitely need the 16gb ram but I have no idea the difference in training time when using a 2.9ghz cpu vs 3.1 ghz vs 3.3 ghz. My models take anywhere from minutes up to hours (10+) on a 3 yr old Dell XPS for reference.

    Is the speedup linear in proportion to the increase in CPU ghz? i.e., there's a 7% increase in CPU speed so computations run 7% faster? 7% sounds like it would be barely noticeable in most situations.
     
  2. egraphixstudios macrumors 6502

    egraphixstudios

    Joined:
    Dec 28, 2007
    #2
    Only difference between them is the lighter wallet...

    on serious note - if your doing video encoding it will be faster but by few minutes from 2.9 to 3.3- otherwise go for the 2.9 to save ££.
     
  3. jerryk macrumors 68020

    Joined:
    Nov 3, 2011
    Location:
    SF Bay Area
    #3
    In most situations you won's see it unless you run simulations, or other long running compute bound processes. And if you do that, you have to wonder about thermal throttling. I do machine learning and often train models that use all 4 cores for an hour or so. I can watch the unit start to throttle after a 5 minutes or so.
     

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