New Macbook Booting to 64Bit

Discussion in 'MacBook' started by ncfuser, Nov 23, 2009.

  1. ncfuser macrumors regular

    Oct 24, 2007
    Just got a the New 2.26GHz Intel Core 2 Duo Unibody Mackbook on Saturday.
    I was just checking things out and I found out that it was in 64-bit mode.

    Its right out fo the box, I never checked anything nor am I holding down the 6 and the 4 while booting.

    Is this now standard for it to boot in 64 bit out of the box?

  2. celticpride678

    Feb 15, 2009
    Boston, MA
    Are your applications running in 64-bit or in the actual kernel and extensions running in 64-bit? To tell this, go to the System Profiler>Select "Software". Then, look at "64-bit Kernel and Extensions"- YES (true 64-bit), NO (applications).
  3. NewMacbookPlz macrumors 68040


    Sep 28, 2008
    Another way to check is to go to your activity monitor and see if the kernel is listed as Intel or Intel (64-bit).

    All apps can run in the 64-bit space despite the kernel being 32-bit, so yeah...

    Perhaps though they enabled 64-bit kernel support on the newest white unibody MacBooks *shrug*
  4. DEE9299 macrumors 6502a


    Oct 3, 2009
    Boston Mass.
    is there and added benefit to running in 64 as to 32?
  5. ncfuser thread starter macrumors regular

    Oct 24, 2007
    States No.

    Got you.
    I was missing reading on how to check.
    I thought this was telling me I was in 64 mode:
    ioreg -l -p IODeviceTree | grep firmware-abi

    But only tells me I "can" boot in 64.

  6. NewMacbookPlz macrumors 68040


    Sep 28, 2008
    On a MacBook? No.
  7. Catfish_Man macrumors 68030


    Sep 13, 2001
    Portland, OR
    Basically no. There's a theoretical performance advantage, but I've never been able to measure it, even with fairly powerful analysis tools and benchmark apps that I wrote specifically to show it. It's primarily useful for very large memory systems (i.e. not a macbook).

    It might help VMWare performance a bit. I haven't checked that.

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