i7-3840QM or i7-3740QM

Discussion in 'MacBook Pro' started by Nebutor1n, Aug 21, 2013.

  1. Nebutor1n macrumors newbie

    Joined:
    Aug 21, 2013
    #1
    I want to buy a MacBook Pro 15 Retina early 2013 with 16GB of RAM, I have a hard issue in choosing a processor i7-3840QM and i7-3740QM, please tell me they have a difference in the 0,1 GHz and 6 or 8 Cache. I will use very often on Parallels with Windows 7. I do not work with graphics software and video editing, but it will be very hard-loaded my Parallels other software. Tell me please, I really need your help in choosing the configuration.

    PS: I had a sad experience with Parallels included in unit 2012 2.6GHz and 8GB of RAM, I had to sell it due to the fact that expand the RAM failed in this model MacBook and very much caught bugs in Windows Parallels.
     
  2. dusk007 macrumors 68040

    dusk007

    Joined:
    Dec 5, 2009
    #2
    It won't make any noticeable difference at all.
    If you had notebooks in both specs in front of you, you'd have problems figuring out which one is the faster, unless you fire up some benchmark program.
     
  3. Hexaea macrumors member

    Hexaea

    Joined:
    Nov 29, 2008
    Location:
    Chicago
    #3
    If it's going to be a work machine just max it out. The upgrade is only what? $200?
     
  4. cirus macrumors 6502a

    Joined:
    Mar 15, 2011
    #4
    There will be no difference.

    The problem is that apple doesn't allow its CPUs to reach full turbo so they perform worse than in a comparable notebook.

    http://www.notebookcheck.net/Review-Apple-MacBook-Pro-15-Retina-2-3-GHz-Mid-2012.78959.0.html

    2.3 ghz version in cinebench R11.5 only reaches 5.5 points vs what should be ~6.2 points.

    [​IMG]

    The 2.6 ghz version reaches 6.4 points.

    [​IMG]

    Yet that is exactly what you should be reaching with a 2.4 ghz chip.

    Not cool apple. :mad:

    If you are buying this computer to use Win 7 and you need a lot of performance it might be better to just buy a PC. But if you want a mac then I doubt you will notice any difference between the two.
     
  5. cbautis2 macrumors 6502a

    Joined:
    Aug 17, 2013
    #5
    It's not the Apple hardware that limits the Turbo Boost but OS X itself. If you bootcamp Windows 7, you'll see that the Turbo Boost is activated indeed and is completely working even when all threads are loaded.
     
  6. Nebutor1n thread starter macrumors newbie

    Joined:
    Aug 21, 2013
    #6
    That is, the easier it will be for me to take 2.7 GHz or pay money for 2.8? Thanks
     
  7. sofianito macrumors 65816

    sofianito

    Joined:
    Jan 14, 2011
    Location:
    Spain
    #7
    Why would OS X limit the Turbo Boost? And how technically it could limit the Turbo Boost with Software?

    Do you mean Turbo Boost reaches its max speed?
     
  8. robvas macrumors 68020

    Joined:
    Mar 29, 2009
    Location:
    USA
    #8
    The MBPr 15" i7 in the test performs almost identically to the top performer in the second test. What are you talking about?
     
  9. Mr. Retrofire macrumors 601

    Mr. Retrofire

    Joined:
    Mar 2, 2010
    Location:
    www.emiliana.cl/en
    #9
    As far as i know, that is exactly what Intel tells the kernel developers (Linux, Darwin (OS X), Windows, et cetera) in the appropriate developer documentation. So this is the correct behavior.

    You can use this utility on OS X, if you want to see this information.

    This is a hardware feature (Turbo Boost 2.0). Turbo Boost 2.0 supports more than one core and is available in Sandy Bridge or newer processors, such as the i7.
     
  10. cirus macrumors 6502a

    Joined:
    Mar 15, 2011
    #10
    Yes, the 2.6 ghz cpu performs exactly as well as the 2.4 ghz 3630qm. Its loosing 200 mhz of turbo.
     
  11. sarthak macrumors 6502

    Joined:
    Nov 19, 2012
    Location:
    Canada
    #11
    According to geekbench browser on average there is a 500 - 1000 point difference between the 3740qm and 3840qm.
     
  12. Interstella5555 macrumors 603

    Interstella5555

    Joined:
    Jun 30, 2008
    #12
    As a general rule if you need to ask about the performance difference between processors you likely won't notice it.
     
  13. Nebutor1n thread starter macrumors newbie

    Joined:
    Aug 21, 2013
    #13
    Well, you want to say that the same program will work better in Boot Camp on Window 7 than on OS X? Why Apple advertises Turbo Boost acceleration under the load of the processor, if it doesn't work? Where is the logic of the Lord?)
     

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