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  1. #1

    Member Since
    Apr 29, 2018
    RAM memory puzzle
    Hi, I'm going to have a go at installing memory into the 2 empty slots on my late 09 27" desktop. My Mac says it has 4 gig of 1067 MHz DDR3 but when I following the installation instruction from the About This Mac pop up and scroll down to my computer is says it takes 1066 MHz DDR3 - that's th tony difference - 1066 or 1067. When I look on amazon the the 1067 (that is supposedly already installed) the MFGR doesn't list my computer as compatible with the 1067. SO I'm totally confused.

  2. #2

    ferrarr's Avatar
    Member Since
    May 21, 2012
    Pawtucket, RI, USA
    L2014 Mac mini macOS 10.13, iPhone 8+ iOS 11, iPad Pro 1 12.9" iOS 11,  Pencil 1
    Go here,, go through their "Upgrade Wizard" and see what it lists as memory for your Mac, then see if you can find it listed on ebay or amazon, for less money.
    -- Bob --
    Please backup. Everything has a life cycle, unexpected and warning free. Nothing will last as long as you want it to.

  3. #3

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Keller, Texas
    2017 27" iMac, 10.5" iPad Pro, iPhone 6s+, iPhone 7+, Numerous iPods, High Sierra
    According to Mactracker your Late 2009 27" iMac takes:

    Maximum Memory 32 GB (Core i5 or Core i7 Actual) 16 GB (Apple)
    Memory Slots 4 - 204-pin PC3-8500 (1066 MHz) DDR3 SO-DIMM

  4. #4

    Member Since
    Dec 11, 2010
    late 2012 mini w/SSD
    1066 MHz is a "clock speed." I'm quite certain that 1067 is the same, just different rounding - up vs down.

  5. #5

    pigoo3's Avatar
    Member Since
    May 20, 2008
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    As gsahli mentioned it's a rounding "thing". I believe the actual RAM speed is 1066.66MHz. Thus 1066MHz is not "technically" as accurate as saying 1067MHz (if rounding to 4 digits). But at the end of the's the same thing inside the computer.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

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