Slower Ram in L15 iMac

Discussion in 'iMac' started by rawweb, Jun 1, 2016.

  1. rawweb, Jun 1, 2016
    Last edited: Jun 1, 2016

    rawweb macrumors 6502a

    rawweb

    Joined:
    Aug 7, 2015
    #1
    I have 32gb of PC3-12800 1600MHz ram laying around from an older 2012 iMac. Will it work with my Late 2015 27? It requires PC3 14900 1867Mhz. Just wondering if I can use it while I wait to save up. Thanks!
     
  2. Samuelsan2001 macrumors 603

    Joined:
    Oct 24, 2013
  3. rawweb thread starter macrumors 6502a

    rawweb

    Joined:
    Aug 7, 2015
    #3
    Thanks, I'll give it a shot!
     
  4. drambuie macrumors 6502a

    Joined:
    Feb 16, 2010
    #4
    PC3 (DDR3) SODIMMS will not fit in PC4 (DDR4) slots. DDR3 SODIMMS have 204 pins and DDR4 SODIMMS have 260 pins. Besides that, DDR4 runs at 1.2 volts vs 1.5 or 1.35 for DDR3.
     
  5. redheeler macrumors 603

    redheeler

    Joined:
    Oct 17, 2014
    #5
    No current iMac takes DDR4 RAM, must be a typo in the OP's post. The late 2015 takes 1.35v 1867 MHz DDR3 (PC3L-14900) but slower 1600 MHz (or faster 2133 MHz) RAM should work fine.
     
  6. rawweb thread starter macrumors 6502a

    rawweb

    Joined:
    Aug 7, 2015
    #6
    Huh? According to OWC it's DDR3
    https://eshop.macsales.com/shop/memory/iMac/Retina-5K2015/DDR3L

    Looks like I mistyped in my OP. I'll update.
     

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