4MEM/9/40000000 after ram swop

Discussion in 'MacBook Pro' started by L plate, Feb 5, 2016.

  1. L plate macrumors newbie

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    #1
  2. keysofanxiety macrumors 604

    keysofanxiety

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    #2
    The RAM frequency is too high. If it was 1333MHz then you've got a 2nd gen i processor. That officially only supports up to 1333MHz. I've even seen kernel panics on 1600MHz, though others haven't had problems. Stick to 2x8GB 1333MHz SODIMM.
     
  3. L plate, Feb 5, 2016
    Last edited: Feb 5, 2016

    L plate thread starter macrumors newbie

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    #3
    Did a test with just 8gb of the 2133 ram ( tested both sticks one at a time)in and that said no faults found put both 2133 in and said fault
    So put one new 2133 and one old 1333( total 12gb )in and now shows no fault
    So thinking u could be right that it only supports 1333 ( go into about shows 12gb of 1333ghz ram ) so looks like I have to return it and go back to 8gb
    Unless anyone knows a way round this ?

    Just for info it's a 15inch late 2011 2.4ghz i7
     
  4. keysofanxiety macrumors 604

    keysofanxiety

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    #4
    Or you could go 16GB 1333MHz RAM which is fully supported. 2x8GB. Besides the additional speed won't really make much of a difference in real-world usage.

    It doesn't matter if one DIMM works, or two occasionally work, or if it doesn't detect some bits here and there. Your CPU does not officially support speeds higher than 1333MHz. Don't mix and match speeds either.
     
  5. L plate, Feb 5, 2016
    Last edited by a moderator: Feb 5, 2016

    L plate thread starter macrumors newbie

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    #5
    will order the 16gb 1333 ones :)
    thanks for the help :)
     
  6. JTToft macrumors 68040

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    #6
    Even though the modules are too fast, they should downclock without issues. You have faulty modules.

    And for keysofanxiety: The practices you are advising are outdated by about a decade. The Core i7 officially supports up to 1600MHz and it has been extensively tested (byt OWC among others) and confirmed to work without any issues in 2011 machines. If anybody got kernel panics on 1600MHz, they had defective modules.
    Mixing different speeds isn't a problem, either. The faster module will simply downclock to match the slower one.
    Unless you have some documentation to suggest otherwise? (I've used mixed speeds in my 2011 for 2-3 years with no issues.)

    Intel Core i7 documentation.
    OWC 1600MHz documentation.
     
  7. ron1004 macrumors 6502

    ron1004

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    #7
    In a 2011 1600MHz is fully supported.

    Where did you get that info? - the 2011 supports 16GB

    Are you sure yours is a 2011 - as far as I know all 2011's shipped with 1600MHz RAM - what's the model number?
     
  8. keysofanxiety macrumors 604

    keysofanxiety

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    #8
    No, 1600MHz is fully supported in a 2012. Not a 2011.

    All 2011s shipped with 1333MHz. All 2012s shipped with 1600MHz. 2010s shipped with 1066MHz.
     
  9. ron1004 macrumors 6502

    ron1004

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    #9
    According to the specs on Apple's site you are correct, but the late 2011 17" that I bought from B&H definitely came with 4GB 1600MHz.

    https://support.apple.com/kb/SP646?viewlocale=en_US&locale=en_US
     

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  10. L plate thread starter macrumors newbie

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    #10
    when i look in to the about it says late 2011, going to get the 1333 16gb stuff as its only really to update it a little till we see what updates there will be this year to the 15inch macbook pro before i get a new one and pass this on all-ready fitted a ssd so thort would add ram as well as i think what ever update they do will still be late 2016 before they are shipped so this will tide me over
    thanks to u all on the forum for the help as always :) :)
     
  11. keysofanxiety macrumors 604

    keysofanxiety

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    #11
    That's wrong, then. Apple never, ever shipped a 17" laptop with 1600MHz from stock. Ever. As yours has 8GB RAM I'm stipulating it was a BTO, but upgraded by them rather than by Apple.
     
  12. JTToft macrumors 68040

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    #12
    - That much is true. Apple shipped all 2011 models with 1333MHz RAM. But that doesn't mean that 1600MHz isn't supported or won't work absolutely fine. It just means it wasn't sold with that configuration.

    If the criterium for which hardware the machine will work with is whether it was sold with that configuration or not, your logic would also lead to the conclusion that the 2011 machines can't work with more than 8 GB as that was the maximum offered by Apple. Sort of a strange conclusion.
     
  13. keysofanxiety macrumors 604

    keysofanxiety

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    #13
    More often than not, the 2011s running 1600MHz get a lot of problems. Kernel panics, not coming out of sleep mode, beeping, not posting, etc. A lot of people don't have issues, and you're one of them. But you're more likely to have a problem if you do run that speed.
     
  14. JTToft macrumors 68040

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    #14
    - Documentation please, as I've never seen anything but isolated reports (if that) of it?
     
  15. keysofanxiety macrumors 604

    keysofanxiety

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    #15
    Experience mainly. 5 years on the job, seen hundreds of 3rd party RAM upgrades. Kernel panics on 1600/16GB but fine when going 1333 (same model RAM too).

    Conversely there's no documentation to say why 1600MHz would work just as well. The Intel processor officially doesn't support more than 1333MHz. Apple doesn't support more than 1333MHz. The RAM is different voltage (1.35v/1.5v if memory serves).

    I'm pleased it works for you. But I would never recommend 1600 on a 2011. Even if it works fine, you're not going to see any performance benefits.

    Sorry if I sound weary, but I've had this argument more times than I can count on MR. Just because it works fine for some doesn't mean it's guaranteed for others. There's too much evidence of problems with 1600 on 2011s for it to be a reliable recommendation.
     
  16. JTToft macrumors 68040

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    #16
    Interesting. Thanks. I don't mean to be argumentative, but I do feel the need to counter some of your points in the spirit of enquiry.

    - So I'm guessing you didn't read my links above? Here's a quote from OWC from the page I linked to:
    - Again, didn't you read the links? Here's the spec for my Core i7:

    - Not an issue. As part of the DDR3 spec, 1.35V modules must also be capable of running at 1.5V and be compatible with machines requiring 1.5V (such as the 2011 machines).
    Here's one example of it described.

    - As well the other way around. The fact that it doesn't work fine for some, doesn't mean it won't or shouldn't work fine for others.

    (You are correct about the performance benefits, though. They are minuscule.)
     
  17. keysofanxiety macrumors 604

    keysofanxiety

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    #17
    Yep, you're completely right. My bad, thanks for being patient enough to correct me. :)
     

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