Crucial recommends replaceing all RAM ???

Discussion in 'iMac' started by DaveFP56, Feb 21, 2014.

  1. DaveFP56 macrumors newbie

    Jun 9, 2010
    I have a late 2012 iMac 27" with 16GB RAM.

    I called Crucial with the notion of buying a 16GB kit to pump up to 32.

    The tech rep said that they don't guarantee that the new RAM will play nicely with the old.

    She suggested I purchase 32GB. :(

    Is this a real issue ?

    Thanks in advance !
  2. RemarkabLee macrumors 6502a

    Nov 14, 2007
    Lot's of people mix RAM. As long as the new is the same spec as the existing, you shouldn't have issues.

    Get the 16GB kit and run a through memory test after installation (Google 'Rember').
  3. Fatboy71 macrumors 65816


    Dec 21, 2010
    I too have a Late 2012 27" iMac. I left in the 8GB ram Apple installed and purchased 16GB from Crucial to give me 24 GB of ram in total, and it works with no issues.

    As long as the new ram is the same spec as the existing ram then it should work.

    Also run Crucial's System Scanner. This downloads a little application what scans your system and shows you the correct ram for your machine.
  4. phrehdd macrumors 68040


    Oct 25, 2008
    The answer is yes and no.

    There are* differences between various makes of RAM from latency to chip arrangements. Most often, it doesn't present a real problem but at the same time, the use of RAM will be only as good as the weakest player. In the real world, most wouldn't find a real difference between all the same and mixed (assuming the RAM sticks play nice together).
  5. DaveFP56 thread starter macrumors newbie

    Jun 9, 2010
    Thank you

    Appreciate the responses. I will just order a set.

    Thanks again!
  6. scaredpoet macrumors 604


    Apr 6, 2007
    I've mixed RAM twice on two different iMacs (a 2011 and a 2012 model), and both are still working fine to this day, with the mixed RAM.

    the one time i did have an issue is when Crucial sent me a defective RAM module and I was getting kernel panics all over the place. Turns out Memtest86+ (which Rember is a graphical front-end for) couldn't find any trouble, but Apple Hardware test did. Crucial replaced the bad module under warranty and all was well.

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