Will the late 09 iMac 27" boot Lion with 64-bit kernel?

Discussion in 'Mac OS X Lion (10.7)' started by joelovesapple, Jun 7, 2011.

  1. macrumors 6502a

    joelovesapple

    Joined:
    Sep 25, 2006
    Location:
    UK
    #1
    Anybody know if this is the case? Anyone on the dev preview who can tell me their stories?

    Thanks. It's certainly not a turn-off if I won't be able to, but is interesting if I could.
     
  2. macrumors 65816

    Joined:
    Jan 1, 2007
    Location:
    San Francisco
    #2
    I boot 64 kernel on my i7 09 model with snow leopard so I don't see why lion wouldn't be able too.
     
  3. thread starter macrumors 6502a

    joelovesapple

    Joined:
    Sep 25, 2006
    Location:
    UK
    #3
    Do you have to 'tell' it to do so or does it do it automatically?
     
  4. macrumors 6502a

    PurrBall

    Joined:
    Oct 25, 2007
    Location:
    Indianapolis
    #4
    It boots the 64-bit kernel by default on my early 2009 iMac, so I see no reason yours shouldn't.
     
  5. macrumors regular

    Joined:
    Jan 28, 2008
    #5
    Snow Leopard can do that....

    http://support.apple.com/kb/HT3770
     
  6. thread starter macrumors 6502a

    joelovesapple

    Joined:
    Sep 25, 2006
    Location:
    UK
    #6
    Thanks!
     
  7. macrumors member

    Joined:
    Sep 24, 2010
    #7
    What was the answer? I have the same question.

    With 10.6 is could boot to 64bit, but it didn't do it automatically, you had to hold down the numbers 6 & 4 during boot up.

    Even that support link, 2 posts up says it is capable, but only 2011 models boot to it by default.

    How does 10.7 behave?
     
  8. Strategy, Jul 24, 2011
    Last edited: Jul 24, 2011

    macrumors member

    Joined:
    Jul 13, 2008
    #8
    You can use the command uname -a in terminal to see what kernel its using.

    RELEASE_i386 i386 is 32bit and RELEASE_X86_64 x86_64 is 64bit.

    Im running a hackintosh setup with a core i5 and it defaulted to 32 bit.
     
  9. macrumors 6502

    Joined:
    May 6, 2008
    #9
    Lion boots into 64bit by default now on all capable machines.

    Add 'arch=x86_64' to the kernel flags in /Library/Preferences/SystemConfiguration/com.apple.Boot.plist, that'll force boot that 64bit kernel.
     

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