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32- or 64-bit Kernel Startup Mode Selector... Mac OS X 10.6 Snow Leopard is 64-bit - or is it?

Well, actually Mac OS X 10.6 Snow Leopard is both 32-bit and 64-bit, and what that means for you depends on both your hardware and your settings.

I put up an accompanying website which should answer most of your questions here.

What does this app do?

  • it shows whether you have a 32-bit or a 64-bit processor
  • it shows whether you have a 32-bit or a 64-bit EFI
  • it shows whether the MacOS X Kernel is set to boot in 32-bit or

What's New

Version 1.6:
  • NEW: updated info on new Mac models
  • NEW: added bug reporter (haven't heard of any bugs but since I added it to all my apps …)

Note: I had a report that the app ran fine on 10.5.8 but crashed on startup on 10.6 for one user. After two days of troubleshooting it turned out that the user had a kext which is NOT compatible with 10.6 in his system extension folder


To check your configuration:
  • Intel Mac
  • Mac OS X 10.4 Tiger or later

To set the kernel\'s startup mode:

  • Intel Mac
  • MacOS X 10.6 Snow Leopard or higher
  • Admin rights (as a system file needs changing)

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32- or 64-bit Kernel Startup Mode Selector User Discussion

3.3 13


Current Version (1.x)


Downloads 110,478
Version Downloads 77,251
License Free
Date 04 Mar 2010
Platform OS X / Intel 32
Price Free
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