RAM Placement in a Mac Pro (800MHz ECC Mac Pro introduced 1/8/08)

Discussion in 'Mac Pro' started by jeffreyk, Jan 13, 2009.

  1. jeffreyk macrumors regular


    Nov 28, 2007
    Highlands Ranch, CO, USA
    I'm going to be purchasing my 1st Mac within a week or two and I have a question about Mac Pro FB-DIMM Memory placement -- seeing that the Mac Pro comes with 2GB Memory (2x1 GB Sticks) standard and I'm going to be adding an extra 8 GB (4x2GB Sticks) to the system (from OWC for an extra kick seeing that memory prices are very affordable for an extra 8GBs).

    Would the proper way to insert the 10 GBs of memory be that the each of the 1 GB sticks would go on each riser on Slots A1 and B1 (the first slots on the riser), with the other sets of FB-DIMMs being placed in pairs on each of the two risers?

    I read the Mac Pro RAM Info at http://www.macperformanceguide.com/Mac-MacProMemory.html, but I just wanted to clarify if I got this correct. Thanks.
  2. bozz2006 macrumors 68030


    Aug 24, 2007

    Riser 'a'
    a1 - 2GB
    12 - 2GB
    a3 - 1GB
    a4 - 1GB

    Riser 'b'
    b1 - 2GB
    b2 - 2GB
    b3 - empty
    b4 - empty

    quote from the website you linked:
    "Aim for a configuration of either 4 or 8 modules. If you’re adding a 4-module kit to an existing 2-module configuration that’s fine, keep the existing memory, installing the new matched 4-module kit in slots A1/A2/B1/B2 first."

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