Mid 2006 / model number A1181 / black or white case / 1.83 or 2.0 GHz Intel Core Duo processor.

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Booting into 64 Bit Kernels and extensions!

I have an early 2009 MacBook, Penryn chip set. I cant seem to boot up on 64 bit mode, why? From what i have heard all intel core 2 duo machines have efi64, if this is the case why cant i boot into 64 bit mode?

NOTE: When i hold the 6 and 4 keys simultaneously at boot, I check my system profiler and it says: 64-bit Kernel and Extensions: No

I have checked my processor via terminal command and it says i have a efi64, how do i boot with 64 bit?

Answered! View the answer I have this problem too

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I gave you an up vote solely because of your un-accepting your own answer. I'd vote you up more if I could. YOU GET GOLD STARS FROM ME!!


Thanx Mayer. :0)


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Turns out that although system profiler does not acknowledge the system is operating under 64 bit, if you check Activity monitor under Utilities it shows the system is operating under 64bit. An annoyance but at least theres another way to confirm this. thanx rj.

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I have unaccepted my answer because i received frugal information from Apple about this. It seems that although most native apps are 64 bit, that doesn't mean that you can forcibly boot into 64 bit mode. Even if your machine meets the software and hardware requirements it turns out that Apple has set limitations on certain machines, including MacBook, minis, and some pros. Kind of odd and can't get a straight answer as to why from Apple, eventhough my ticket was handled by an "engineer".


I can understand why Apple would boot into 32 bit mode by default, a purely 64 bit kernel would wreak havok on driver compatibility etc.,etc. but it's not comforting to know that Apple has limited the machines that can run full 64bit mode to a couple of machines, some of the newer models like my machine wont ever be able to boot into full 64 bit mode. i got a list from the macforums site and some of the new iMacs, minis, and pros are also limited. Booo Apple.


Care to share the list?


Type Date Model

Identifier Sample

Model Numbers

Xserve Early 2008 Xserve2,1 MA882LL/A

Early 2009 Xserve3,1 MB449LL/A

Mac Pro Early 2008 MacPro3,1 MA970LL/A

Early 2009 MacPro4,1 MB871LL/A, MB535LL/A

iMac Early 2008 iMac8,1 MB323LL/A, MB324LL/A, MB325LL/A

Early 2009 iMac9,1 MB417LL/A, MB418LL/A, MB419LL/A, MB420LL/A

MacBook Pro Early 2008 (Penryn) MacBookPro4,1 MB133LL/A, MB134LL/A, MB166LL/A

Late 2008 (Unibody) MacBookPro5,1 MB470LL/A, MB471LL/A

Early 2009 (Unibody) MacBookPro5,2 MB470LL/A, MB471LL/A, MB604LL/A, MC226LL/A

there ya go Mayer. Hope it helps


heres the link so u can read the whole article yourself, it's baffling.http://blog.fosketts.net/2009/08/30/64bi...


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Are you running Snow Leopard? From what I read on the Apple site you need 10.6 installed in 64 bit mode to use 64 bit kernel. I could be wrong about that so maybe someone can clarify this for both of us. Ralph

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I am running Snow Leopard.


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