August 2009: Mac OS X 10.6 Snow Leopard still runs on 32-bit chips, but for the first time everything from the apps to the OS kernel supports 64-bit operation. Unlike Windows, Apple never ships separate 32- and 64-bit versions of Mac OS X. October 2007: Mac OS X 10.5 Leopard launches with actual support for regular 64-bit apps Universal Binaries can run on 32-bit and 64-bit Intel and PowerPC machines, covering four architectures within a single app.August 2006: Apple launches the Intel Mac Pro with a 64-bit Woodcrest CPU mainstream 64-bit Core 2 Duo Macs follow shortly afterward.June 2005: Apple announces that it will begin using Intel processors, which are still primarily 32-bit.April 2005: Mac OS X 10.4 Tiger allows for 64-bit processes under-the-hood-they can be spun off from another process or run via the Terminal.
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