^ To je 32-bitni kernel.
—
As an end user, you really should not worry about the bitness of the kernel. If your Apple computer is not booting into K64 by default, you don’t need it—unless, of course, you know that you need it. (Say, because you are a kernel developer or an otherwise system-level developer and want to test something against a 64-bit kernel.) In particular, the 32-bit kernel, which is the default on most existing x86-based Apple computers, runs 64-bit applications just fine. Therefore, as long as you have a 64-bit processor, your Snow Leopard installation is 64-bit from the typical end-user standpoint.
http://www.osxbook.com/blog/2009/08/31/is-your-machine-good-enough-for-snow-leopard-k64/