Can Macbook Pro Late 2011 run DDR3L RAMs?

Discussion in 'MacBook Pro' started by YogaSx, May 24, 2016.

  1. YogaSx macrumors newbie

    Joined:
    May 22, 2016
    #1
    I have read MBP Late 2011 can run 16GB and 1600mhz although recommended is 8GB and 1333mhz.

    I want to purchase below RAM.

    http://www.amazon.com/Kingston-HyperX-Impact-1600MHz-HX316LS9IB/dp/B00KQCOTCM

    It runs as 1.35v and DDR3L.

    I read some people can successfully install this on MBP Late 2011.

    I want to ask while MBP Late 2011 has 1.5v, and DDR3, how can it run DDR3L and 1.35v RAMs?

    Cheers
     
  2. JTToft macrumors 68040

    Joined:
    Apr 27, 2010
    Location:
    Aarhus, Denmark
    #2
    It can run 1600 MHz and up to 16 GB. It can't run 1.35V, but all 1.35V modules can run at 1.5V which is what the machine requires.
    (1.35V = DDR3L)

    The memory you posted is compatible.
     
  3. YogaSx thread starter macrumors newbie

    Joined:
    May 22, 2016
    #3
    Hello JTToft,

    Thank you very much for your help.

    Is there any performance loss when running 1.35V modules by Macbook Pro 1.5V?

    Cheers
     
  4. curmudgeonette macrumors 6502

    Joined:
    Jan 28, 2016
    Location:
    California
    #4
    If there were a difference, there would be a performance increase. (The higher voltage makes the memory faster, but alas, the configuration data likely won't enable that. Trivia: A decade ago, PC3200 RAM was generally PC2700 RAM run at a higher voltage.)

    FYI, I upgraded the memory in my early 2009 MBP which is speced to take 1066MHz DDR3 memory. I decoded the actual part numbers on the memory chips and they turned out to be 1333MHz DDR3L chips.The configuration chip simply lies and tells the MBP it is slower memory - otherwise it apparently would be rejected by the Mac.
     
  5. JTToft macrumors 68040

    Joined:
    Apr 27, 2010
    Location:
    Aarhus, Denmark
    #5
    - Compared to running actual 1.5V modules in the 1.5V machine, no. No difference.
    Compared to running the 1.35V modules in a 1.35V machine, theoretically there could be due to the lower power consumption on that machine. But it probably won't matter in practice.
     
  6. YogaSx thread starter macrumors newbie

    Joined:
    May 22, 2016
    #6
    Thank you very much guys for your all help. Much appreciated.

    Just last question. What is the CAS Latency for Macbook Pro Late 2011? I could not find it in System Reports.

    Mentioned module is CL 9, btw. I hope CAS Latency is also suitable for Macbook Pro.
     
  7. JTToft macrumors 68040

    Joined:
    Apr 27, 2010
    Location:
    Aarhus, Denmark
    #7
    - You're most welcome. I'd guess the original is CL 9, but that's on 1333 MHz. Higher frequency modules typically also have higher latency. Basically, it doesn't really matter what you get. Mine are CL 10 1600 MHz, but 9 or 11 should work equally as well.
     
  8. YogaSx thread starter macrumors newbie

    Joined:
    May 22, 2016
    #8
    I see. Thanks again.
     

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