MacOS X 10.6 Snow Leopard is 64-bit - or is it?. Well, actually MacOS 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 0 website which should answer most of your questions at
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 in 64-bit mode
- it shows whether the MacOS X Kernel is running in 32-bit or in 64-bit mode
- it shows whether Apple officially supports booting a 64-bit kernel on your Mac
- it allows you to select whether you want to start the MacOS X Kernel in 32-bit or in 64-bit mode (the setting might be ignored on MacBooks, depending on how Apple implements the restriction)
- accompanying webpage explains what the whole commotion about 32-bit and 64-bit in MacOS X Snow Leopard is about
What's new in this version:
- New: added info for the new Mac Models.
- New: added bug report in case it throws an error (haven't had it happen or heard of any but as I was adding this to all my apps ...).
Thanks for all the feedback - but PLEASE read the website before asking questions. About 500 people must have asked why their Mac is still in 32bit KERNEL mode after applying the settings - and it is explained in detail on the website (I think I got rather grumpy after answering the first 300... See all new features »