Memory issue in 5,1 8 core

Discussion in 'Mac Pro' started by pianoman88, Nov 30, 2012.

  1. pianoman88 macrumors regular

    Joined:
    Aug 20, 2010
    #1
    OK

    I upgraded from 12 (arranged as 4,1,1,0 4,1,1,0) to 26 GB RAM. I placed my working 1 GB chips in slots 4 and 8.

    SLOT
    1 4 GB
    2 4 GB
    3 4 GB
    4 1 GB
    5 4 GB
    6 4 GB
    7 4 GB
    8 1 GB

    I received this information when I rebooted:

    SLOT
    1 4 GB
    2 -
    3 4 GB
    4 1 GB
    5 4 GB
    6 4 GB
    7 4 GB
    8 -

    So I switched chips between 2 and 3

    Now I get this:

    1 4 GB
    2 4 GB
    3 -
    4 -
    5 4 GB
    6 4 GB
    7 4 GB
    8 -

    This tells me that the chip in 3 is good.

    So I take out 4 and 8

    Now I get this:

    1 4 GB
    2 4 GB
    3 -
    4 -
    5 4 GB
    6 4 GB
    7 4 GB
    8 -

    Suggestions? This reminds me of logic problems back in college.
     
  2. radug macrumors member

    Joined:
    Aug 12, 2010
    Location:
    UK
    #2
    if i remember correctly, the instructions in the booklet recommend filling the slots in pairs of equal size, but starting from the middle, so 4+5, 3+6, 2+7, 1+8 ; all in descending order of GB.

    anyone feel free to correct me if i'm wrong.
     
  3. pianoman88 thread starter macrumors regular

    Joined:
    Aug 20, 2010
    #3
    Close. The system suggested
    1 - 4
    2 - 4
    3 - 1
    4 - 4

    5 - 4
    6 - 4
    7 - 4
    8 - 1

    All is well!
     

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