Is my Macbook 32bit or 64bit?

Discussion in 'Mac Basics and Help' started by desi22601, May 29, 2008.

  1. desi22601 macrumors member

    Feb 18, 2008
    Im not sure.. its pretty new i got it after the Februrary Update of this year, its the 2.4 ghz intel core 2 duo version.. is it a 32 bit or 64?
  2. jrock2004 macrumors 6502

    May 4, 2008
    If it came with leopard preinstalled than yes
  3. desi22601 thread starter macrumors member

    Feb 18, 2008
    yea it came with leopard preinstalled, so was that a yes to 32 or 64 bit?
  4. desi22601 thread starter macrumors member

    Feb 18, 2008
    o ok thanks :D
  5. jrock2004 macrumors 6502

    May 4, 2008
  6. logana macrumors 65816


    Feb 4, 2006
    Is it not as simple as

    Core duo = 32 bit
    all Core 2 duo = 64 bit ??
  7. adrix7 macrumors newbie

    Jun 10, 2008
    hi, i bought mine in early 2007 i think.. its a macbook 2.2ghz leopard

    i tried to do a parallel desktop with linux ubuntu 8, it says i cant do it because it requires a kernel x86 - 64bit cpu and my macbook is i686...

    i tried open suse 10 it says it cant run coz my macbook is 32 bit..?

    please somebody explain to me whats all this..:(

  8. alphaod macrumors Core


    Feb 9, 2008
    Because the virtual machine created by Parallels was 32-bit; has nothing to do with your computer's 32/64-ness.
  9. macmark117 macrumors newbie

    Aug 31, 2009
    64 bit

    hi i have a macbook 2.16 core 2 duo mid 2007. can anyone tell me if its 64 bit?
  10. Sambo110 macrumors 68000

    Mar 12, 2007
    Is there any use booting up into 64 bit mode? It takes ages, but does it actually make it faster? Is there a way to tell if your in 64 bit more right now?

    Just booted up into 64 bit, I know how to tell if your in it. But if anything, it's slower?
  11. Zerozal macrumors 6502

    Apr 3, 2009

    All Core 2 Duos are 64bit.
  12. modernmagic macrumors member

    Sep 14, 2003
    About This Mac -> More Info -> Software
    64-bit Kernel and Extensions: No
    64-bit Kernel and Extensions: Yes

  13. curtischip macrumors newbie

    Sep 22, 2010
    I've got a Core 2 duo macbook and mine checks out as " 64-bit Kernel and Extensions: No".. So not all Core 2 Duo machines are at 64 bit apparently...
  14. alust2013 macrumors 601


    Feb 6, 2010
    On the fence
    Indeed they are, they just don't boot the 64-bit kernel. There really isn't a whole lot of point to it, especially on a laptop. You still have a 64-bit processor
  15. Dat270 macrumors newbie

    Jun 16, 2010
    As long as I have a Core 2 Duo, does it matter that i'm loaded in "64-bit Kernel and Extensions: No", if I want to run boot camp with windows 7, can I install 64 bit or do I need to run 32 bit? Or does it matter?
  16. boball macrumors newbie

    Jun 22, 2011
    "How to tell if your Intel-based Mac has a 32-bit or 64-bit processor" ----->

    Apple confirms above - all Core 2 Duos are 64-bit processors.
  17. hexonxonx macrumors 601

    Jul 4, 2007
    Denver Colorado
    I have a core 2 duo and system profiler says no on mine.
  18. Anonymous Freak macrumors 603

    Anonymous Freak

    Dec 12, 2002
    There are three things at work here:

    1. Is the processor 64-bit? AKA: Is the processor capable of running 64-bit code. If you have any Intel-based system *OTHER* than the very earliest 2006 systems with a "Core Duo" (or Core Solo, which was an option on the Mac Mini,) then the processor is 64-bit. *EVERY* "Core 2 Duo", *EVERY* Xeon, and *EVERY* "Core iSomething" is 64-bit.

    2. Is the Kernel 64-bit? This is significantly less important than you think. By default, only the Xserve would boot into the 64-bit kernel. Really, the only thing this affects is if the core of the OS can access more than 4 GB of memory for its own internal use. This has no bearing on applications running 64-bit code, or using more than 4 GB of RAM.

    3. Is the application 64-bit? This is what matters to most users. If #1 is "Yes", and the application is capable of 64-bit operation, then you're good. For the most part, the only gain you get by running in 64-bit mode is that individual applications can access more than 4 GB of RAM. Standard consumer applications have effectively no reason to do so, only higher-end applications often need the use of that much memory. (Right now, any way.) Also, because of the way 64-bit mode works on Intel (and AMD) processors, *ALL* operations see a very slight performance increase running in 64-bit mode vs. 32-bit mode - if the application is capable of 64-bit mode. In general, this performance boost is under 10%, though, so for most uses, it's barely noticeable.

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