Mismatch memory speed differances

Discussion in 'MacBook Pro' started by krypticos, Jun 6, 2014.

  1. krypticos macrumors regular

    Nov 9, 2007
    ill start off by saying, sorry i didnt search for a thread on this because i couldnt think what it would be called.

    so what i am wanting to know is if i take an 8gb and a 2gb memory modules and put them in to my mac how much of a speed difference would there be vs 2x8gb sticks. the reason i ask is because instead of upgrading my mac mini to 16gb of ram i was thinking of taking one of my 8gb sticks out of my macbook pro and swapping it with one of the 2gb stick in the mini so both would have 10gb of ram.

    Thanks for you time and help
  2. snaky69 macrumors 603

    Mar 14, 2008
    In artificial benchmarks you'll see a 10-15% difference in memory speed as it would lose dual channel ability.

    In real, actual, day to day use? You'd be hard pressed to notice.
  3. Freyqq macrumors 601

    Dec 13, 2004
    Basically this. RAM speed is rarely the bottleneck for performance.
  4. damuse macrumors newbie

    Aug 21, 2012
    Put it this way: with 2x2 GB mavericks was churning virtual and compressed memory badly on my 2012 13" MBP doing fairly basic stuff. Responsiveness got pretty bad.

    Replaced one stick with an 8GB module, and it's been smooth sailing ever since.

    Memory mismatch and losing dual channel doesn't matter much when the system's starving for real memory.

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