DDR3 memory compatibility (2011)

Discussion in 'MacBook Pro' started by ls1dreams, Apr 15, 2013.

  1. ls1dreams, Apr 15, 2013
    Last edited: Apr 15, 2013

    ls1dreams macrumors 6502

    Joined:
    Aug 13, 2009
    #1
    Hi,

    I have an early 2011 MBP 13" (i5).

    According to crucial, I need:

    DDR3 PC3-10600 • CL=9 • Unbuffered • NON-ECC • DDR3-1333 • 1.35V • 512Meg x 64 • lead free • halogen free • for Mac • Part #: CT3309331

    I've noticed a few sellers on ebay mention that the DDR3 204-pin RAM they are selling isn't compatible with Apple.

    Which of these specs are critical and which are not?

    For example, would this kit work?
    http://www.amazon.com/G-SKILL-204-P...-8GBSQ/dp/B004U3MQQY/ref=cm_cr_pr_product_top

    Q1: The main difference is the voltage is listed as 1.5v instead of 1.35v. I assume 1.5v will work?

    Q2: If I see other RAM that's CL-11 instead of CL-9 does that matter as well? I know it CL-11 is slower, but assume it would still be compatible.
     
  2. Orlandoech macrumors 68040

    Orlandoech

    Joined:
    Jun 2, 2011
    Location:
    Salt Lake City, UT
    #2
  3. MrGimper macrumors 68040

    MrGimper

    Joined:
    Sep 22, 2012
    Location:
    Andover, UK
    #3
    I have 2x8GB Komputerbay RAM in my 2011 MBP. Got it from Amazon. Never had a problem.

    I also use 64GB of their RAM in my ESXi server and never had a problem with that either.
     
  4. Bear macrumors G3

    Joined:
    Jul 23, 2002
    Location:
    Sol III - Terra
    #4
    I can't tell if the GSkill memory is compatible from the Amazon page. However, it's a higher voltage which if it works, will negatively affect battery life - this may not be noticeable.

    Apple is usually strict on module timing, so I would look at CL-9. Have you seen this Crucial memory @ Amazon?
     
  5. leman macrumors 604

    Joined:
    Oct 14, 2008
    #5
    DDR3 is a standart, so ideally any module should work. In practice, however, this is individual. There is always a small chance that you will have problems.
     
  6. Bear macrumors G3

    Joined:
    Jul 23, 2002
    Location:
    Sol III - Terra
    #6
    Yes DDR3 is a standard, however, memory modules do have different specifications that need to match what your system can handle.
     
  7. Ccrew macrumors 68020

    Joined:
    Feb 28, 2011
    #7
    Actually, not true. That's the voltage at which the memory will achieve it's advertised spec. Has nothing to do with the amount it uses. That's controlled by the logic board.
     
  8. ls1dreams thread starter macrumors 6502

    Joined:
    Aug 13, 2009
    #8
    Does this mean that 1.5v ram might underperform? (Since crucial indicates that it uses 1.35v ram?)
     
  9. Ccrew macrumors 68020

    Joined:
    Feb 28, 2011
    #9
    Technically, yes, but in reality it will be virtually unnoticeable. It's the reverse of overvolting memory when you're overclocking, where you bump the voltage to the memory bus to get a bit more speed.

    Personally I tend to run what the machine calls for, but the sky won't fall if you don't.
     
  10. ls1dreams thread starter macrumors 6502

    Joined:
    Aug 13, 2009
    #10
    I was just able to pick up 8gb of 1.5v ram for only $28 brand new, so at half the price of 1.35v ram I figured it was worth the deal.
     

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