2017 iMac important to used matched RAM pairs?

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

  1. mikepro macrumors 6502

    Sep 3, 2010
    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?

  2. CWallace macrumors 603


    Aug 17, 2007
    Seattle, WA
    Yes, because of memory-interleaving performance boosts.
  3. Fishrrman macrumors G5


    Feb 20, 2009
    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

    Jun 16, 2017
    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.

Share This Page