Mac Pro / Lion 10.7.4 build 11E53 memory reporting

Discussion in 'Mac Pro' started by michael_aos, May 22, 2012.

  1. michael_aos macrumors 6502

    Joined:
    Jan 26, 2004
    #1
    I upgraded my 2006 Mac Pro 1,1 to 16GB back in February. Added 4x 2GB DIMM's from OWC.

    It had been reporting 16GB until recently. This morning, I noticed that 2 of the DIMM's are reporting as 1GB instead of 2GB.

    DIMM Riser B/DIMM 3:

    Size: 1 GB
    Type: DDR2 FB-DIMM
    Speed: 667 MHz
    Status: OK
    Manufacturer: 0x80CE
    Part Number: 0x4D3339355435373530435A342D4345363120
    Serial Number: 0x5006909C

    DIMM Riser B/DIMM 4:

    Size: 1 GB
    Type: DDR2 FB-DIMM
    Speed: 667 MHz
    Status: OK
    Manufacturer: 0x80CE
    Part Number: 0x4D3339355435373530435A342D4345363120
    Serial Number: 0x0208E89D

    They still show as "OK" in Lion, and are correctly identified as 2GB under Snow Leopard.

    I'm kind of wondering it the issue is really just a reporting bug and not a problem with the RAM.
     
  2. nambuccaheadsau macrumors 6502a

    nambuccaheadsau

    Joined:
    Oct 19, 2007
    Location:
    Nambucca Heads Australia
    #2
    Have similar upgraded Mac Pro 2.1 with 16GB memory. When first installed this is precisely what happened with reporting, but after a few weeks this settled down to always shows 16GB. Think it is a reporting error only.

    Also noticed this when switching back from Windows 7 using Bootcamp.
     
  3. michael_aos thread starter macrumors 6502

    Joined:
    Jan 26, 2004
    #3
    I swapped the DIMM's from slots 3 & 4 with the ones from 1 & 2.

    Now it's reporting 16GB again...
     

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