That said, OS X can still run 32-bit apps. In the process, a few 64-bit systems with 32-bit graphics drivers and 32-bit EFIs are dropped from the support list.

July 2012: OS X 10.8 Mountain Lion boots into the 64-bit kernel by default on all systems that support it, including a few that previously defaulted to the 32-bit kernel.Older Macs continue to default to the 32-bit kernel and 32-bit drivers, but new Macs launched in this era typically default to the 64-bit kernel. July 2011: Mac OS X 10.7 Lion drops support for 32-bit Intel CPUs (Snow Leopard had already ended all support for PowerPC systems).Snow Leopard’s 64-bit capabilities are a major component of Apple’s marketing push, which infamously includes “ no new features.” However, most systems still default to loading the 32-bit kernel. 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.

June 2003: The PowerPC G5 CPU is the first 64-bit-capable chip to show up in a Mac, and with Mac OS X 10.3 Panther can theoretically address up to 8GB of RAM.

It’s nicely situated between the nitty-grittiness of the specific WWDC sessions and the bird’s-eye overview you get in the general keynote, and it’s always full of interesting tidbits.īuried in that presentation this year was news about the next phase of the macOS transition from 32-bit to 64-bit, a process that has been much longer and messier for the Mac than it was for iOS. After the main blockbuster WWDC keynote, Apple does a big “ Platforms State of the Union” presentation aimed more specifically at the gathered audience of developers.

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