![]() ![]() You can use the “Kind” column in Activity Monitor to see whether apps you’re running are 32- or 64-bit, and there’s a new “Legacy Software” section in the System Information utility that also lists 32-bit apps on your system along with their developers (if the apps have been properly signed).Īpple has included a “64-bit testing mode” in Mojave so developers can have a version of macOS that flatly refuses to run 32-bit code. You’ll see the same message if you use a 64-bit app with 32-bit plugins or any other 32-bit dependencies. In Mojave, 32-bit apps will continue to run, but you’ll see a nag message when you launch them, letting you know that they need to be updated in the future to continue working. Apple announces macOS Mojave, which will be the last version of the OS to run 32-bit code. June 2018: All new apps and updates to existing apps submitted to the Mac App Store need to be 64-bit only. ![]() April 2018: High Sierra’s 10.13.4 update begins warning users about “not optimized” (read: 32-bit) apps the first time they’re launched.January 2018: All new apps submitted to the Mac App Store need to be 64-bit only.June 2017: Apple announces macOS 10.13 High Sierra and says it’s the last release that will run 32-bit apps “ without compromise.”.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 introduced 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.To recap, here’s the full timeline of macOS’ 32- to 64-bit transition: That doesn’t change in Mojave, but this is the last version of macOS that will run those 32-bit apps at all. Still, 32-bit apps run just as well as they did when Snow Leopard shipped on 32-bit Intel Macs back in 2009. Today’s Macs-and any Mac running Mojave or any version of the operating system going all the way back to Mountain Lion-have been all 64-bit, barring a handful of first-party apps and background services and a steadily shrinking list of third-party apps. Mac OS X began life as a 32-bit operating system, but a slow, steady transition to 64-bit hardware and software has been happening for over 15 years. ![]()
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