RAM question

Discussion in 'Mac Pro' started by fluidedge, Jun 7, 2008.

  1. fluidedge macrumors 65816


    Nov 1, 2007
    I've just opened up my January 2008 mac Pro for a bit of a spring clean and noticed something strange. The two RAM modules (I just have standard 2GB at the moment) are on different spacers. If they are to be a matched pair shouldn't they occupy RiserA slots 1 and 2 rather than Slot 1 of Riser A and B respectively?

    Anyway i switched the one from RiserB slot 1 to RiserA slot 2 and everything seems to be OK.

    Will i see any improvement from matching up the RAM modules?

    Also when i add more RAM should i fill up Riser A or move to Riser B slots 1 and 2
  2. sash macrumors 6502a


    Nov 23, 2004
    As far as I know, 2 x 1 GB Apple stock RAM are always installed in that way (slot 1 on A and B). So you may be pretty sure that's 100 % correct and kosher. No need to replace.

  3. fluidedge thread starter macrumors 65816


    Nov 1, 2007
    I'm going to try XBench'ing the machine both ways and see if it makes a difference.
  4. peejack macrumors 6502a

    Aug 7, 2007
    How you found them is how they should be configured, leave them.
  5. passingXstorm macrumors regular

    Jun 5, 2008
    The older Mac Pros had RAM installed by pairs; riser A 1 & 2, riser B 1 & 2, riser A 3 & 4, riser B 3 & 4. The newer ones alternate risers (i.e. riser A 1, riser B 1, riser A 2, riser B 2, etc). When you look on the inside of the Mac Pro door there should be a graphical tutorial on it that shows how to install RAM correctly on your Mac Pro. Hope that helped. :D
  6. Roy macrumors 6502

    Jul 6, 2006
    I've never seen anyone explain WHY the 2006 Mac Pros and the early 2008 Mac Pros have/has their original memory installed differently by Apple. There has to be a reason, but I've never seen anyone ask why the difference and I've never seen an explanation. Anyone know?

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