Dump OS - Available memory question

Discussion in 'macOS' started by maflynn, Sep 5, 2009.

  1. maflynn Moderator


    Staff Member

    May 3, 2009
    Ok guys this a dumb question but I was perplexed so I'll post it here :)

    I have a MBP with 4 gig of ram, when I go into the activity monitor it shows only 3.75gig

    fair enough, I booted (like I always do) the computer using the default 32bit kernel.

    For giggles I rebooted with the 64bit kernel and wouldn't you know it, I still saw 3.75gig?

    Any explanation for that.
  2. Guiyon macrumors 6502a

    Mar 19, 2008
    North Shore, MA
    If I recall correctly that model does not have dedicated RAM for the video card so it grabs 256MB from the main memory and, as a result, does not show up for the rest of the system to use.

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