Installing 14GB RAM Mac Pro Early 2008

Discussion in 'Mac Pro' started by paulogic, Apr 18, 2011.

  1. paulogic macrumors newbie

    Joined:
    Apr 18, 2011
    #1
    Hi there,

    I've got a Mac Pro (2x2.8 Quad Core) Early 2008. The computer came with 2GB of RAM (2x1GB). Last year I bought an extra 4GB (2x2GB) from Crucial and installed them without any problem.

    I just got 8GB (2x4GB) and I thought I was installing the chips properly, but OSX only shows that I have 10GB installed.

    My configuration is as follows:

    Riser A:

    DIMM 1: 1GB
    DIMM 2: 1GB
    DIMM 3: 4GB
    DIMM 4: 4GB

    RISER B:

    DIMM 1: 2GB
    DIMM 2: 2GB
    DIMM 3: EMPTY
    DIMM 4: EMPTY

    Anyone have any suggestions?

    Thank you!
     
  2. Brisby macrumors newbie

    Joined:
    Apr 5, 2010
    #2
    Here's my suggestion -

    Riser A

    DIMM 1: 4GB
    DIMM 2: 2GB
    DIMM 3: 1GB
    DIMM 4:

    RISER B:

    DIMM 1: 4GB
    DIMM 2: 2GB
    DIMM 3: 1GB
    DIMM 4:
     
  3. Umbongo macrumors 601

    Umbongo

    Joined:
    Sep 14, 2006
    Location:
    England
    #3
    You can't do that as they have to be installed in pairs.

    The optimum configuration is A:4,4,0,0 B:2,2,1,1 as this places more equal amounts of memory on each riser.
     
  4. paulogic thread starter macrumors newbie

    Joined:
    Apr 18, 2011
    #4
    Thank you Umbongo! That worked like a charm! Much appreciated!

    Cheers,
    Paul
     

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