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  1. #1
    4GB RAM installed; only 3.75GB displaying
    wavinwayne's Avatar
    Member Since
    Nov 01, 2010
    Location
    North AL
    Posts
    162
    Your Mac's Specs
    Late '09 Macbook Pro 13"
    Rep Power
    10
    4GB RAM installed; only 3.75GB displaying
    As you can see in the screenshots below, I have 4GB of RAM in my MBP, but the Activity Monitor only shows a total of 3.75GB of RAM. Why is that?



    Don't believe anything I tell you, unless it is consistent with what you already know to be true, or unless you have taken the time to research the matter to prove its accuracy to your satisfaction. This is known as "doing your homework."

  2. #2
    4GB RAM installed; only 3.75GB displaying
    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    41,576
    Your Mac's Specs
    2011 17" MBP 2.2ghz, 16gig ram, OS 10.11.6
    Rep Power
    43
    What does "About This Mac" say under the Apple menu?

    - 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

  3. #3
    4GB RAM installed; only 3.75GB displaying
    johndope83's Avatar
    Member Since
    Feb 27, 2011
    Location
    Manila, Philippines
    Posts
    123
    Your Mac's Specs
    2011 13" MBP 2.3 Ghz Intel Core i5 4GB RAM
    Rep Power
    10
    have you tried good old google?

    check this out: Why does my Mac show 3.75GB of RAM when I have 4GB of memory installed?

    The answer is simple: your Mac has a GPU that uses shared memory. This means that your graphics card borrows some of the systems memory and uses it exclusively for graphics processing, this kind of GPU with memory sharing is common on the iMac, Mac Mini, MacBook, MacBook Air, and the 13″ MacBook Pro model.
    ** quoted from the site

    i think it's also the same with your hard disk and other storage devices... it will never give you an exact number as said.

    cheers!!!
    2011 13" MBP 2.3 Ghz Intel Core i5 4GB RAM

  4. #4
    4GB RAM installed; only 3.75GB displaying
    wavinwayne's Avatar
    Member Since
    Nov 01, 2010
    Location
    North AL
    Posts
    162
    Your Mac's Specs
    Late '09 Macbook Pro 13"
    Rep Power
    10
    Quote Originally Posted by pigoo3 View Post
    What does "About This Mac" say under the Apple menu?

    - Nick
    4GB

    Don't believe anything I tell you, unless it is consistent with what you already know to be true, or unless you have taken the time to research the matter to prove its accuracy to your satisfaction. This is known as "doing your homework."

  5. #5
    4GB RAM installed; only 3.75GB displaying
    wavinwayne's Avatar
    Member Since
    Nov 01, 2010
    Location
    North AL
    Posts
    162
    Your Mac's Specs
    Late '09 Macbook Pro 13"
    Rep Power
    10
    Quote Originally Posted by johndope83 View Post
    have you tried good old google?

    check this out: Why does my Mac show 3.75GB of RAM when I have 4GB of memory installed?



    ** quoted from the site

    i think it's also the same with your hard disk and other storage devices... it will never give you an exact number as said.

    cheers!!!
    Makes sense. Thanks for the info!
    Don't believe anything I tell you, unless it is consistent with what you already know to be true, or unless you have taken the time to research the matter to prove its accuracy to your satisfaction. This is known as "doing your homework."

  6. #6
    4GB RAM installed; only 3.75GB displaying
    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    41,576
    Your Mac's Specs
    2011 17" MBP 2.2ghz, 16gig ram, OS 10.11.6
    Rep Power
    43
    Quote Originally Posted by johndope83 View Post
    have you tried good old google?

    check this out: Why does my Mac show 3.75GB of RAM when I have 4GB of memory installed?
    Awesome answer. I knew graphics hardware on some Apple laptops shared system ram...but I didn't realize that it showed up in Activity Monitor that way.

    Thanks,

    - 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

  7. #7
    4GB RAM installed; only 3.75GB displaying
    quin's Avatar
    Member Since
    Dec 20, 2009
    Posts
    432
    Your Mac's Specs
    MBP 13, 2.4, 8GB, 120GB SSD OCZ
    Rep Power
    11
    I just installed 8GB RAM into my MBP 13 few days ago, it shows 7.75 GB on AMonitor. Info from Google --shared memory through graphics chip.

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