We uncovered what 64-bit computing means (both to you and the pros) and ran hands-on tests with key apps on high-end workstations. What's more, we built our own 64-bit powerhouse, at a price that's lower than you'd guess. We'll show you how.

In technology, some ideas take time to germinate, none more so than 64-bit computing, where the operating system and software (including most drivers) run on a 64-bit CPU from Intel or AMD. Linux has been 64-bit for eight years, and Apple's operating system for five. But compatibility problems have dogged the 64-bit versions of Windows since its introduction in Windows XP. There are several key advantages, such as improved performance and support for many gigabytes of RAM. The real question is, why 64-bit—and why now? And, why should you care?

Let's be honest: The promise of 64-bit computing has been around for a while—some would say it's a broken promise. Yet the planets have finally aligned: Microsoft offers a 64-bit version of both Windows Vista Ultimate and Windows XP Pro, and 64-bit versions of Linux are freely available. According to Gartner, one out of every four PCs sold today comes with a 64-bit OS installed. As for hardware, both Intel and AMD have offered 64-bit processors for years. And the additional RAM supported by the wider data bus is now amazingly affordable, thanks to a streamlined manufacturing process and mainstream levels of demand.

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