64-bit OS

Discussion in 'iMac' started by axma, Aug 3, 2010.

  1. axma macrumors member

    Joined:
    Sep 3, 2006
    #1
    Hi all,
    I have some questions about 64-bit:

    1) Does new imacs have 64-bit EFI firmware ?
    2) Does Snow Leopard in new imacs boot by default in 64-bit mode ?
    3) If not, how can i modify the default mode ?
    3) Can Windows 7 64-bit be installed using Bootcamp ?

    Thx !
     
  2. Hellhammer Moderator

    Hellhammer

    Staff Member

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #2
  3. bolen macrumors 6502

    bolen

    Joined:
    Jul 22, 2008
    Location:
    Sweden
    #3
    I can comment on 4) - Yes, you can install Windows 7 64bit.

    I'm also a bit interested in 2), even though it doesn't matter at all. :)
     
  4. axma thread starter macrumors member

    Joined:
    Sep 3, 2006
    #4
  5. zwaffel macrumors newbie

    Joined:
    Jul 30, 2010
    #5
    If you have more then 4GB memory, you need to run 64bit right, or can osx address more then 4GB in 32bit?
     
  6. Queso macrumors G4

    Joined:
    Mar 4, 2006
    #6
    Yes OSX even in 32-bit mode uses 64-bit memory addressing. The line between 32 and 64 bit isn't quite as defined as on Windows. OSX is a hybrid between the two, allowing 64-bit apps and processes to run on top of a 32-bit kernel and vice versa.
     
  7. asap18 macrumors newbie

    Joined:
    Jul 8, 2010
    #7
    Actually from what I've been hearing is that the new ATI drivers are 64 bit only. If they are then the new iMacs must boot 64 bit by default.
     
  8. zwaffel macrumors newbie

    Joined:
    Jul 30, 2010
    #8
    how can you see if you're booted in x64 mode?
     
  9. frega macrumors member

    Joined:
    Jul 28, 2010
    #9
    source?
     
  10. Rudy69 macrumors 6502a

    Rudy69

    Joined:
    Mar 30, 2009
    #10
    My quad i5 booted in 32bit by default (now in 64bit mode though ;))
     
  11. CheesePuff macrumors 6502

    Joined:
    Sep 3, 2008
    Location:
    Southwest Florida, USA
    #11
    That would also explain why they perform so much better then the previous drivers.
     

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