2009 Mini Upgrade With Mismatched Memory

Discussion in 'Mac mini' started by kred321, Nov 30, 2011.

  1. kred321 macrumors newbie

    May 3, 2009
    Long story short, I recently acquired a free 1 4GB memory stick from a friend through some returns confusion.


    I have the 2009 Mac Mini upgraded to Snow Leopard and the original 2 1GB memory sticks from Apple. Should I go with 4 GB or 5 GB keeping a 1GB stick in? My quick investigation suggested if the voltage, timing and latencies were the same, it'd be fine otherwise I should bother. However, I was unable to find this info for my original RAM.
  2. philipma1957 macrumors 603


    Apr 13, 2010
    Howell, New Jersey
    go with 5gb the 2009 mini is not picky most likely it will work.
  3. dcoulson macrumors member

    Aug 21, 2010
    If you are going through the hassle of dismantling a 2009 Mini to upgrade the memory, you might as well spend $20 for another 4Gb stick and have 8Gb.
  4. PLamarine macrumors 6502


    Jun 12, 2009
    Central MA
  5. davidmartindale macrumors regular


    Jan 28, 2011
    PNW, USA
    Except the 2009 Mac mini only recognizes 4GB
  6. philipma1957 macrumors 603


    Apr 13, 2010
    Howell, New Jersey
    the 2009 mac mini does 8gb ram with the proper apple efi download
  7. mdgm macrumors 6502a

    Nov 2, 2010
    You need this update: http://support.apple.com/kb/DL888

    It should have been downloaded via Software Update back in 2009 and installed.

    You can confirm whether you have this update already installed or not by following the instructions here: http://support.apple.com/kb/HT1237

    Note: Only early 2009 Minis such as yours need this update. Late 2009 Minis come with the newer EFI pre-installed.

    Several Macs can take more RAM than what Apple officially states, usually about double.

    The 2011 iMac, Mac Mini and MacBook Pro can all take double the official maximum. All 2011 iMacs can take 4x8GB RAM, all 2011 Mac Mini's and 2011 MBPs can take 2x8GB RAM.
  8. paulrbeers macrumors 68040

    Dec 17, 2009
    Agreed as well. While you will probably notice an improvement in speeds by having more memory (2GB is borderline at best anymore)... You will still be losing up to 5-10% of your max by not having a paired set of memory. Your computer won't be able to take advantage of the dual channel memory since they will be different sizes. Will you notice? Probably not, but it is just worth noting is all.

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