The short answer is that Leopard is a mix of 32-bit and 64-bit. • Tiger added 64-bit support for low-level system libraries, enabling 64-bit for non-GUI applications. • Leopard added 64-bit support throughout the system frameworks, so any app can be 64-bit.

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The most relevant program for Mac os iso download for 32bit os is Mac OS X. Mac OS X 10.6 Snow Leopard is a version of Apple's Mac OS X, released on. Mac OS X Snow Leopard is a glamourous operating system for your Mac that says good by to the old applications and is aimed to provide a more refined UI which is with some more performance improvements, a good gesture and a hub for next generation 64 Bit applications.

• Snow Leopard will add a 64-bit kernel and many 64-bit user applications shipped by Apple. The 32-bit versions of all the frameworks and libraries are of course still available, but running apps in both modes requires both stacks to be loaded, which is inefficient, and a big reason why Apple is strongly encouraging developers to get on the boat and build their apps with a 64-bit version. Because the kernel in 10.5 is still 32-bit, the greater amount of addressable memory is achieved with some trickery. The exact details evade me at the moment, but I think that under Leopard you can only address 4 GB of physical memory — I believe the 64-bit memory space spills over to virtual memory on disk, just like when 32-bit processes exceed the amount of installed RAM. Edit: I was incorrect about the virtual memory aspect.

The 32-bit kernel can address more than 4 GB of memory, but adding lots of physical memory uses up a good chunk (~ 1/3) of the kernel's 32-bit memory space, which (at the limit) can decimate kernel performance. Obviously, if your application uses more memory than is available (either in 32-bit or 64-bit mode), the OS must map virtual memory. Among other things, the 64-bit kernel in Snow Leopard provides breathing room in the kernel itself by vastly increasing the address space it can use, including for describing physical memory. Most people aren't running into that limit yet, but they will start to as installed RAM increases in the near future.

Sneaking in a few days before its promised September release, the tune-up for Mac OS X Leopard costs $29 for current Leopard users, and packs just enough punch to be worth your money. Apple is careful to point out that Snow Leopard isn't a complete system overhaul, but rather a collection of hundreds of smaller refinements to make Leopard run more gracefully. Hidden among smaller tweaks are some technical improvements that result in a smoother, easier-to-use Leopard with plenty for Mac fans to be excited about.

The user interface and everyday tasks feel faster in general, although we didn't notice a substantive improvement in application performance. Even if you're not a current Leopard user, the $169 package that includes Snow Leopard, iLife, and iWork is a steal for the system upgrade and two of Apple's major software suites, not to mention the long-pined-after inclusion of Microsoft Exchange compatibility. Finally you will be able to connect with Exchange Servers (without using Microsoft's Entourage), but only if your company is using Microsoft Exchange 2007; many still aren't. Snow Leopard is offered on a single install disk--there are no separate, tiered pricing structures to worry about--and you're getting every feature and technical enhancement available in a single install. Unfortunately, for those on PowerPC systems, Snow Leopard only works with Intel Macs. Installation Installation of Snow Leopard is dead simple and (according to Apple) up to 45 percent faster than Leopard using a newly designed installer that asks only one question during the process.

On our test machine, the process took about an hour, including two automatic restarts. The default setting installs Snow Leopard without tampering with any of your saved files, music, photos, or documents.

Mostly we had no problems, but on one test machine we needed to reinstall the OS when it had trouble rebooting. Fortunately the new installer is designed for safely reinstalling the OS in the event you encounter any hiccups during your initial installation. On our second try, the OS installed perfectly on our test machine and no files were harmed.