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#Is my mac 32 bit or 64 bit how to#
Summary: it's not an entirely a meaningful question, but to the extent that it's meaningful Mavericks is a 64-bit OS. How do I determine if I have a 32-bit or 64-bit system ANSWER In this article, we will explain how to determine if your system is a 32-Bit or 64-Bit system.
10.6, for example, would install exactly the same on a 32- or 64-bit computer, and then decide at runtime which mode each program should run in. Note that there've never been separate 32- and 64-but versions of OS X. The most visible example of this is the System Preferences, which normally runs in 64-bit mode, but can quit & relaunch itself in 32-bit mode to run old 32-bit-only preference panes (if you can still find one). But it's still fully capable of running old 32-bit programs, and there are even a number of system programs that can run in either mode (again, to provide compatibility with old 32-bit software). Starting in 10.8, Apple removed the 32-bit versions of the kernel and most built-in apps, meaning that it'll only run on 64-bit CPUs. Over the history of OS X, it's gradually morphed from 32-bit only (through 10.2 I think), to fully 32+64-bit capable (10.6), to mostly-64-bit-only (10.8-10.9). It also has a multi-architecture binary format, so a single program can include both 32- and 64-bit code, and the OS will simply run it in whatever seems to be the most appropriate mode at the moment. OS X doesn't really have a single overall mode - it can easily run different components (different processes, the kernel, etc) in different modes.
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