MacBook Pro speed comparisons

Discussion in 'MacBook Pro' started by mactrue, Mar 27, 2013.

  1. mactrue, Mar 27, 2013
    Last edited: Aug 30, 2013

    mactrue macrumors newbie

    Joined:
    Mar 26, 2013
    #1
    I have 2 nearly identical 15" macbookpro laptops. One was purchased on Jun 24, 2011 ( Order # , snow leopard), and the second on Nov 03, 2011 (Order # Lion), . Both machines have the intel 2.2 GHz quad-core i7 processor. Every effort was made to make these two machines identical. But the first machine runs about 3 times faster than the second. I do very computationaly intensive runs that solve mathematical equations through thousands of iterations that may last 3 or 4 days. The slower machine would take 9 to 12 days.
    When I set up my first macbookpro, one question asked was "When I do intense computations, do I want to distribute the workload among the cores?" I answered YES. But the setup for my second (slower) machine never asked that question. The difference in speeds is too dramatic to attribute it to snow leopard vs Lion.
    What do I need to do to make my second machine run as fast as my first to take full advantage of the processor?
     
  2. mrapplegate macrumors 68030

    Joined:
    Feb 26, 2011
    Location:
    Cincinnati, OH
    #2
    What asked you this:
    "When I do intense computations, do I want to distribute the workload among the cores?"

    The key it seems to be with what software asked you that. I've never seen such a question from my many years of Mac ownership, so I'm going to assume it was not the operating system.


    Each application has to be written to take advantage of multiple cores, so what software is not working well for you.
     
  3. mactrue thread starter macrumors newbie

    Joined:
    Mar 26, 2013
    #3
    Thanks for responding. The question was asked as I was initially setting up the macbook pro out of the box. At that point, I had not installed any software of my own at all. I have asked the same question at an Intel forum, but there has been no reply.
     
  4. robvas macrumors 68020

    Joined:
    Mar 29, 2009
    Location:
    USA
    #4
    I've set up a ton of macs and never seen this!
     
  5. mactrue thread starter macrumors newbie

    Joined:
    Mar 26, 2013
    #5
    I'm still trying to understand how two nearly identical laptops can have such a significant difference in speed. The fast machine is acting as if some paralelization code has been activated for the simulations that I run, but I haven't installed any such code.
     
  6. joshhedge macrumors regular

    Joined:
    Sep 23, 2012
    #6
    A simple suggestion, that could work, would be to reset the SMC and PRAM of the under performing machine. That is where my technical knowledge drops off I'm afraid.
     
  7. fskywalker macrumors 65816

    fskywalker

    Joined:
    Nov 6, 2009
    #7
    What comes to my mind could be RAM memory speed; very likely that the faster one has a faster RAM than the other one.
     
  8. joshhedge macrumors regular

    Joined:
    Sep 23, 2012
    #8
    They're the same model so the RAM, given that OP hasn't changed it himself, should have the same frequency and timings.
     
  9. fskywalker macrumors 65816

    fskywalker

    Joined:
    Nov 6, 2009
    #9
    not necessarly, it could depend on availability at the time of assembly.
     
  10. duervo macrumors 68000

    duervo

    Joined:
    Feb 5, 2011
    #10
    What happens when you take the drive out of the faster system, and boot the slower system from it?

    If the slower system runs faster from that drive, then it most likely points to a software issue.

    If it runs slower, then it points to hardware, assuming firmware levels and all other aspects equal.

    You can also rule out RAM by swapping them between systems and comparing.
     
  11. adnbek macrumors 65816

    adnbek

    Joined:
    Oct 22, 2011
    Location:
    Montreal, Quebec
    #11
    Open activity monitor on each when running the task and look at the cpu usage graphs at the bottom. Are all 4 cores being maxed out on both machines?

    Also, install a temperature monitoring program and see what temps you're getting on both. The CPU on the slower one might be throttling due to higher temps.
     
  12. mactrue thread starter macrumors newbie

    Joined:
    Mar 26, 2013
    #12
    Thanks for all the suggestions. I'll give them all a try.
    I've watched the activity monitor on the slow machine, and all cores are being used. None of them are maxed out. I'll install the temperature monitor to see what that shows.
     

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