Sooo... Leopard + Boot _ Holding #'s 6+4...

Discussion in 'OT Technology' started by Ty Webb, Dec 4, 2009.

  1. Ty Webb

    Ty Webb You don't have to go to college. This isn't Russia

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    My brother called me up today and said that Leopard by default is running in 32 bit mode. OKay fine whatever.
    He said to reboot and when you see the apple screen to hold the numbers 6 and 4 on the keyboard and it will boot in 64 bit mode.

    I confirmed my Mac Pro is running leopard in 32 bit through Terminal.

    Any thoughts on this? Any issues or positive aspects to running in 64 bit mode? Does this need to be done on every bootup?

    I don't want to fuck anything up since my system currently runs flawlessly.
     
  2. DouggieJ

    DouggieJ OT Supporter

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    Assuming you mean Snow Leopard...

    Which version of Mac Pro do you have? The first generation ones won't boot into the 64 bit kernel even if you press 6+4.

    Doesn't really matter though, 32-bit kernel is still recommended even with the newest desktop Macs. 64-bit applications still run in full 64-bit mode.
     
  3. Ty Webb

    Ty Webb You don't have to go to college. This isn't Russia

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    I have a newer quad core nehalem model.
     
  4. DouggieJ

    DouggieJ OT Supporter

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    Try holding down the 6+4 keys as soon as the chime rings, before the Apple screen.

    Or you can try sudo nvram boot-args="arch=x86_64" on the command line then restart. That could be dangerous though.
     
  5. Kieffer87

    Kieffer87 Orly OT Supporter

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    Did this on my MBP awhile ago, didn't see any difference in speed.
     
  6. mobbarley

    mobbarley Active Member

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    dude, google. this shit was going on (in here even) when SL was released. your computer can still run 64 bit apps and handle 64 bit memory space even without holding down 64.
     
  7. Devin

    Devin New Member

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    This an app you can download that will do this for you every boot up
     
  8. verbal

    verbal Active Member

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    Since this is the case, what would be a good reason to boot the kernel in 64 bit mode?
     
  9. TheWeasel

    TheWeasel Guest

    None. It can actually cause you to not be able to run some things. Stick to booting into thr 32-bit kernel and you will get the most of the OS.
     

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