Mac Pro memory pairs: must be identical?

Discussion in 'Mac Pro' started by ydmusic, Jan 13, 2008.

  1. ydmusic macrumors newbie

    Apr 5, 2007
    I recently upgraded my Mac Pro refurb (from apple online store) 3Ghz quad, 2Gb RAM (4X 512Mb chips) with an extra 4Gb Ram (2X 2Gb from OWC). As I was moving the chips around, I noticed that the apple 512Mb chips were not identical, meaning that:

    - 2 were produced in the U.S.A.
    - 1 was produced in Singapore
    - 1 was produced in Korea, with a different brand name, and the heatsink looked slightly different than the others.

    If I am correct, each pair must be matched. Doesn't that also mean that they should come from at least the same factory and have the same heatsink construction?

    I will call Apple on Monday to ask, since it is still under warranty. Any other opinions?

    Also, I have a memory configure graph that recommends that I locate the chips in this order:

    Riser A: 2Gb,2Gb, empty, empty
    Riser B: 512Mb, 512Mb, 512Mb, 512Mb

    Is that the best way?

  2. netnothing macrumors 68040


    Mar 13, 2007
    According to the Mac Pro manual, it states:

    DIMMs must be installed in pairs of equal size from the same vendor.

    I'm not positive on how exact it needs to be.

    As for the are correct. The 2GB DIMMS need to be on Riser A slots 1 & 2, and the 512's go on Riser B.


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