2015 27" iMac - Matching ram

Discussion in 'iMac' started by Hls811, Feb 11, 2016.

  1. Hls811 macrumors 6502a


    Apr 19, 2004
    New Jersey
    I just ordered a new 27" iMac, I went with the 8GB model since I could upgrade on my own. I haven't bought a computer in a while that I've been able to or wanted to upgrade myself - I bought a 16GB kit (8x2) - Can I leave the 8GB (4x2) in there and make 24GB or does it cause problems doing that?
  2. mmomega macrumors demi-god


    Dec 30, 2009
    DFW, TX
    Usually as long as the RAM is the same speed, 1866 and 1866, you'll be good.

    RAM will change to match the slowest speed installed, example if you bought 1600MHz RAM and installed along side the 1866MHz stock RAM then all of your RAM would operate at 1600MHz.
    So even then it will still work just at a reduced speed.

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