How to Get Your Mac to Recognize Newly Installed RAM

If you’ve recently upgraded the RAM on your Mac, and it still lists the old amount of RAM as being installed – this tutorial will help resolve the problem.

  1. To view the amount of RAM installed in your Mac, open the System Profiler by going to Applications -> Utilities -> System Profiler. In the Hardware Overview window, look for the Memory: section. As you can see, my MacBook Pro has 2GB of RAM installed.

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  3. If after you upgrade (add) more RAM to your Mac, and it’s not listed as being installed – first check to make sure the ram is “seated” properly in the memory slots. If it appears to be installed properly, reboot your Mac while holding down the command + option + p + r keys.

    Wait until you hear the startup “chime” twice, and then let go of the command + option + p + r keys. This is known as “zapping the PRAM”. When your Mac starts up again, relaunch the System Profiler, and now your ‘proper’ amount of RAM should be displayed (in the example below, 4GB).


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  5. That’s it!

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5 thoughts on “How to Get Your Mac to Recognize Newly Installed RAM”

  1. This is what worked for me:-

    Precautions:
    Shut off power, pull the plug and all chords attached to the tower.
    Use static gloves ( lolx no one does)

    I originally had all 8 x 1GB Ram.
    So making the total = 8GB. All 8GB showed up.

    I purchased on Amazon in 2018. (2x 4GB)
    A-Tech for Apple 8GB Kit 2X 4GB PC2-5300 667MHz Mac Pro MacPro2,1 MacPro1,1 Mid 2006 A1186 MA356LL/A Memory RAM

    No I’m not promoting anyone. This is just what I bought.

    Riser card 1
    Slot1: 4GB
    Slot2 : 4GB
    Slot3: 1GB
    Slot4: 1GB

    Riser card 2
    Slot1: 1GB
    Slot2 : 1GB
    Slot3: 1GB
    Slot4: 1GB

    So making the total = 14GB, but only 10GB showed up. I never bothered with it. lolx.

    Now in 2019 I purchased 2x 4Gb again.
    A-Tech for Apple 8GB Kit 2X 4GB PC2-5300 667MHz Mac Pro MacPro2,1 MacPro1,1 Mid 2006 A1186 MA356LL/A Memory RAM

    Riser card 1
    Slot1: 4GB
    Slot2 : 4GB
    Slot3: 1GB
    Slot4: 1GB

    Riser card 2
    Slot1: 4GB
    Slot2 : 4GB
    Slot3: 1GB
    Slot4: 1GB

    So making the total = 20GB, and all ram showed up.

    When it comes to PC desktops, I was told, the best practice is to put similar cards in 1/3 or 2/4 slots, but it seems Apple does not work that way.

    Hope this helps someone.

    1. If you had originally installed it as below it would have worked. RAM needs to be balanced across the two risers.

      Riser card 1
      Slot1: 4GB
      Slot2 : 1GB
      Slot3: 1GB
      Slot4: 1GB

      Riser card 2
      Slot1: 4GB
      Slot2 : 1GB
      Slot3: 1GB
      Slot4: 1GB

  2. Pingback: How To Upgrade the Memory (RAM) In a Mac Mini – Simple Help

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