Max RAM

Discussion in 'Mac Pro' started by h9826790, Apr 13, 2014.

  1. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #1
    I have a question about max RAM.

    No matter W3520 or W3690, both clearly state that they only support 24G of RAM, why my Mac Pro 4,1 Quad can run 32G of RAM or even more?

    Is that just a max demostrated result from the factory, but the not real limit?

    Otherwise, I couldn't undertand why my machine can handle more RAM than the CPU limit.
     
  2. MH01 macrumors G4

    MH01

    Joined:
    Feb 11, 2008
    #2
    64gb for single CPU , 96Gb for dual CPU.

    My understanding is the OS limit is 96gb, not sure if that has been changed in mavericks.
     
  3. AidenShaw macrumors P6

    AidenShaw

    Joined:
    Feb 8, 2003
    Location:
    The Peninsula
    #3
    Sometimes the specs reflect what was possible when the system or CPU was released, but later higher density but compatible DIMMs come out and larger memories work. The specs aren't updated, because that requires testing and validation.

    I'm typing from a Dell XPS 435MT with 24 GiB of RAM, even though the specs still say that is supports a max of 12 GiB. Some time after the system was released with 6 slots at a max of 2 GiB/slot some compatible DIMMs of 4 GiB came out. I have twelve of those 4 GiB DIMMs.
     
  4. h9826790 thread starter macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #5
    Thanks for all the answers and links, now I have a brief idea of the WHY ;)
     

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