Do I need to be running in the 64 Bit Kernel to utilize my new MBP's 8GB of Ram?

Discussion in 'MacBook Pro' started by Xystence, May 13, 2010.

  1. Xystence macrumors regular

    Apr 17, 2010
    Hello everyone,

    I ordered a MacBook Pro, my first Mac on the day the new line came out and I have been using it since. My question is simple, I am just unsure of the answer. I know in Windows if I ran the 32bit version of windows it would not even recognize the full 4gb of ram my pc had, let alone 8. Does this same rule apply to the mac? I know the mac shows me with 8gb of ram just fine. Apple recommends I leave the kernel the way it is, whats everyones opinion on this? Should I do that code change to make my mac always run in 64bit or just leave it alone?

    I simply wanna make sure what I paid for is being utilized completely

    Thank you for your time!
  2. MrCheeto macrumors 68030


    Nov 2, 2008
    No, Mac OS X is hybrid. Though the kernel is usually running in 32bit on most machines, it has always been able to access more ram than the 32bit limit.
  3. Eddyisgreat macrumors 601

    Oct 24, 2007

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