why match ram?

Discussion in 'Mac Pro' started by blitzydog, May 17, 2006.

  1. blitzydog macrumors member

    Apr 23, 2006
    I see a lot of people asking, but nobody answering.

    What's so great about having two of the same ram chips?

    I was thinking of leaving in the 2x256 and buying 1 1gb chip for a total of 1.25.. unmatched. Is that bad?
  2. jsw Moderator emeritus


    Mar 16, 2004
    Andover, MA
    There are numerous threads on this already.

    For example, look here or here or here.

    And those are just a few of the threads I happened to have replied to yesterday.

    In essence: paired RAM is a bit faster for a given amount of RAM, but more RAM is almost always faster than less RAM. 1.25 GB will be way faster than 512MB matched. :)
  3. CanadaRAM macrumors G5


    Oct 11, 2004
    On the Left Coast - Victoria BC Canada
    Hi, Welcome to MacRumors

    First suggestion is you tell us what machine you have, it makes a difference.

    Second suggestion - use the Search function of the forum to look for recent articles covering the same question you are asking.

    On the intel Macs, the machine will utilize dual channel mode of the memory buss when you have matching chips. This gives a small but real speed increase. However, the performance hit you suffer from not having enough RAM is much greater, so more total RAM trumps matched RAM.

    1 Gb is the minimum for decent performance, if you are using professional apps under Rosetta, you will want 1.5 to 2 Gb RAM.

    So get the 1 Gb module now, and upgrade it to 2 Gb when finances allow.


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