2017 iMac important to used matched RAM pairs?

Discussion in 'iMac' started by mikepro, Jul 21, 2017.

  1. mikepro macrumors 6502

    Joined:
    Sep 3, 2010
    #1
    I remember back in the day with dual channel DDR2, it was important to install 2 identical matched pairs in a bank for optimal performance. Is that still true with current day iMac? In other words, if I want to add 16 GB, better to get 2 matched 8GB than a single 16GB stick of RAM?

    Thanks!
     
  2. CWallace macrumors 603

    CWallace

    Joined:
    Aug 17, 2007
    Location:
    Seattle, WA
    #2
    Yes, because of memory-interleaving performance boosts.
     
  3. Fishrrman macrumors G4

    Fishrrman

    Joined:
    Feb 20, 2009
    #3
    On paper, "matched pairs" of RAM will always look better.

    In real life, you probably won't notice any difference at all.

    I replaced one of the 2gb DIMMs in my 2012 Mini with an 8gb DIMM.
    Looks and runs the same... to me.

    If you feel like splurging, put 2 DIMMs in.
    If not, add just one.
    I'll betcha either way runs just fine.
     
  4. Luxtrau macrumors member

    Joined:
    Jun 16, 2017
    Location:
    Germany
    #4
    I did some benchmarks with mixed and matched pairs. The matched ones are always slightly faster. If you notice a difference in daily use - I don't know. But yes, if you want to use the full potential use matched pairs.
     

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