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  1. #1
    three beeps after installing faster ram

    Member Since
    May 06, 2014
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    three beeps after installing faster ram
    friend upgraded to 16GB ram and gave me his 2 x 4GB PC3-12800S sticks to put into my imac 2.66 core 2 duo with 2 x 2GB PC3-8500 sticks. I removed my 4GB and installed the 8GB. Seated very well (well as far as I can tell anyway)

    Three beeps after power on.

    reinstalled the old ram and runs fine.

    is this ram not compatible with my old imac?

  2. #2
    three beeps after installing faster ram
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
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    Nambucca Heads Australia
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    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    Simple ~ wrong memory.

    Macs are very fussy about memory and must have low density modules, not cheaper high density PC shop modules. Go to OWC and/or Crucial ~ Mac specialists for your memory needs. The 2008/09/10 2.66GHz iMac, last of the 2.66, use PC3-8500 modules.


    http://eshop.macsales.com/shop/memory/iMac/DDR3_2009

    Don't let friends do anything to your Mac if they ain't specialists. Especially PC folk who LOVE to tinker inside Macs.
    Last edited by harryb2448; 05-07-2014 at 12:30 AM.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  3. #3
    three beeps after installing faster ram

    Member Since
    May 06, 2014
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    so just to be clear. The 8GB was ram that came out of my friend's mac.

    Mac's can't use faster memory than what it originally had? (I'm a recent toe dipper in the mac pond)

  4. #4
    three beeps after installing faster ram
    pigoo3's Avatar
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    May 20, 2008
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    2011 13" MBP 2.3ghz, 8gig ram, OS 10.7.5
    Quote Originally Posted by redeeps View Post
    so just to be clear. The 8GB was ram that came out of my friend's mac.

    Mac's can't use faster memory than what it originally had? (I'm a recent toe dipper in the mac pond)
    Same answer as Harry mentioned...wrong ram. The three beeps is a specific alert for wrong or bad ram installed.

    - 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

  5. #5
    three beeps after installing faster ram
    chas_m's Avatar
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    Mid-2012 MBP (16GB, 1TB HD), Monoprice 24-inch second monitor, iPhone 5s 32GB, iPad Air 2 64GB
    Quote Originally Posted by redeeps View Post
    so just to be clear. The 8GB was ram that came out of my friend's mac.

    Mac's can't use faster memory than what it originally had? (I'm a recent toe dipper in the mac pond)
    Just to be clear: it's nothing to do with being faster and everything to do with being DIFFERENT RAM. With rare exceptions, no Mac can use RAM that's different than the ones it shipped with (other than changes in capacity, of course).

  6. #6
    three beeps after installing faster ram
    chscag's Avatar
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    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    And to make another point.... The latest Windows machines likewise can not use memory other than what the machine was designed for. So it isn't just Macs that are "fussy".

  7. #7
    three beeps after installing faster ram

    Member Since
    Dec 11, 2010
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    1,352
    Quote Originally Posted by redeeps View Post
    Mac's can't use __faster__ memory than what it originally had? (I'm a recent toe dipper in the mac pond)
    Not to beat a dead horse...

    The speed of memory that any computer can use is dependent on the memory bus and memory controller on the motherboard. You can't just put faster-spec memory in and expect things to be faster.

    (On the other hand, "most" memory of the correct type but faster spec will be backward-compatible - ie, work at the slower speed of the memory bus. So, must be something other than just speed spec.)

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