2 Replies Latest reply: Feb 4, 2013 5:36 PM by Grant Bennet-Alder
dwightfromwa Level 1 (0 points)

I loaded my mac pro (2008) with a total of 14 Gig of RAM but the hardware report in "about this mac" only shows the first two on Card A and the first two slots on Card B with memory. The other 4 slots show "empty". any suggestions?

Mac Pro, Mac OS X (10.7.5)
  • Allan Eckert Level 9 (50,726 points)

    This can happen if the memory cards are not fully seated,

    the memory cards are bad,

    the memory cards are the wrong type

    or the slots are bad.



  • Grant Bennet-Alder Level 9 (56,679 points)

    Allan, that is a good list!


    I ran into one more to add to it:


    The new DIMMs are not compatible with the old DIMMs.


    As a check against this and some of the other items on Allan's list, I suggest installing only the new DIMMs, and see if they all are working. Then you are starting with known-good modules. Then you can add back the old ones and see if everything still works.


    For 2008 and previous, they go matched pairs in adjacent slots on the SAME Riser, Densest usually go in the first slots.