Is my computer 32-bit or 64-bit?

Question

Is my computer 32-bit or 64-bit?

Question 1)

I have a MacBook Air. It is version 3,2. I bought it in November in Korea last year. It has 256 GB SSD internal drive. It is Intel core 2 duo.

How do I find out whether it is 32-bit or 64-bit?

I need to find out this information.

Question 2)

I have another MacBook Air. I bought it in late 2009. It is Rev C I think. It has 120GB HDD. Is this 32-bit or 64-bit?

MacBook Air late 2010, 2.16 GHz 4GB RAM OS10.6.4, MacBook Air Rev C, PowerbookG4, Mac OS X (10.6.4)

Posted on Oct 4, 2011 12:01 AM

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Answer 1

Oct 4, 2011 2:29 AM in response to applecore_eater

All Macbook Airs are 64-bit (i.e they have CPUs that are capable of full 64 bit addressing). Have a look at the following web site for a full list.

http://www.everymac.com/mac-answers/snow-leopard-mac-os-x-faq/mac-os-x-snow-leop ard-64-bit-macs-64-bit-efi-boot-in-64-bit-mode.html

However, you will note that they are restricted to boot in 32 bit mode. This may be because the 64-bit kernel only really helps when you need to address more than 4GB of memory. No Macbook Air has more than 4 GB so using a 32-bit kernel saves some memory in some data structures in the OS.

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