Ram from iMac late 2012 in MacBook Pro mid 2009?

Discussion in 'iMac' started by Pejsen, Dec 19, 2012.

  1. Pejsen macrumors newbie

    Dec 14, 2012
    Hi forum

    I've been lurking in here for a few year, finally took the time to create a user recently as i bought my first ever iMac in the new Apple store in Hong Kong last thursday.

    It's a 3.2ghz, 1TB, 675MX with 8GB ram

    I've ordered 4x8GB ram from Crucial (2x16GB kits).

    I have an old Macbook Pro (mid 2009) 2.53GHZ Intel Core 2 Duo. Currently has 2x2GB ram.

    When I upgrade the iMac can I put the 2x4GB ram from that in my old MacBook?

    Data from Crucial ram recommender:
    iMac 2012 late kit:
    Module Size: 16GB kit (8GBx2)
    Package: 204-pin SODIMM
    Feature: DDR3 PC3-12800
    Specs: DDR3 PC3-12800 • CL=11 • Unbuffered • NON-ECC • DDR3-1600 • 1.35V • 1024Meg x 64 •

    MacBook Pro mid 2009 (unibody):
    Module Size: 8GB Kit (4GBx2)
    Package: 204-pin SODIMM
    Feature: DDR3 PC3-8500
    Specs: DDR3 PC3-8500 • CL=7 • Unbuffered • NON-ECC • DDR3-1066 • 1.5V • 512Meg x 64 •

    So it's the same size, the iMac ram is faster but i guess there able to 'clock' down backward. The obvious difference is the CL-timings and the voltage!

    Should I try or just forget about and try and see if someone will swap ram with me?
  2. Pejsen thread starter macrumors newbie

    Dec 14, 2012
    This will not work.

    For the sake of future googlers i just wanted to let you know - it doesn't work.

    The Macbook Pro won't post anything on screen although you can hear the harddrive and superdrive spins up. I does like *BEEP* *BEEP* *BEEP*
  3. jimmywp macrumors newbie

    Feb 4, 2013
    PC3-12800 in older iMacs that call for PC3-8500

    The original question asked about using PC3-12800 RAM in a mid-2009 iMac. He later reported it would not work - supposedly because the 12800's were not compatible. I have successfully installed 2 PC3-12800 2GB modules in a Late 2009 iMac. The memory specs for my Late-2009 iMac are the same as the mid-2009's -- up to 4x 2GB modules. I believe the problem was trying to use 4GB modules, not trying to use the PC3-12800 versions.
  4. attempt03 macrumors newbie

    Oct 31, 2009
    Add-on 4gb PC3-12800 into two 2gb PC3-8500 older iMac

    Hello jimmywp,
    Glad to hear you're successful.
    Planned to add-in 4gb PC3-12800 (1600MHz) into my late-2009 iMac 21".

    But, in Apple forum (https://discussions.apple.com/message/15141579#15141579) says it must be compatible i.e. it needs same speed of 1066 MHz, not 1600MHz.

    Would you reconfirm again. Many thanks.

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