Since 2001, the breakthrough technologies and rock-solid UNIX foundation of Mac OS X have made it not only the world’s most advanced operating system but also extremely secure, compatible, and easy to use. Snow Leopard continues this innovation by incorporating new technologies that offer immediate improvements while also smartly setting it up for the future.
64-bit computing used to be the province of scientists and engineers, but now this generational shift in computing gives all users the tools to apply the power of 64-bit to speed up everything from everyday applications to the most demanding scientific computations. Although Mac OS X is already 64-bit capable in many ways, Snow Leopard takes the next big step by rewriting nearly all system applications in 64-bit code and by enabling the Mac to address massive amounts of memory. Now Mac OS X is faster, more secure, and completely ready for the future.
More secure than ever.
Another benefit of the 64-bit applications in Snow Leopard is that they’re even more secure from hacke
rs and malware than the 32-bit versions. That's because 64-bit applications can use more advanced security techniques to fend off malicious code. First, 64-bit applications can keep their data out of harm's way thanks to a more secure function argument-passing mechanism and the use of hardware-based execute disable for heap memory. In addition, memory on the system heap is marked using strengthened checksums, helping to prevent attacks that rely on corrupting memory.
64-bit applications in Snow Leopard deliver faster performance at common operations.
32-bit compatible.
To ensure simplicity and flexibility, Mac OS X still comes in one version that runs both 64-bit and 32-bit applications. So you don’t need to update everything on your system just to run a single 64-bit program. And new 64-bit applications work just fine with your existing storage devices, PCI cards, and Snow Leopard-compatible printers.
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