Why You (Don't) Need 64-Bit
While most of today's software is designed for 32-bit processors, all of today's midrange and high-end processors from Intel and AMD support 64-bit instructions. Though the technologies have different names—Intel 64 and AMD64—they're compatible in all practical ways.
To take advantage of 64-bit software, you need to run an operating system that specifically supports the technology, such as the 64-bit version of Windows Vista. You'll also want to look for applications specifically written for 64-bit processors. A few 64-bit apps are available today, but even when running 32-bit software, multitaskers can still benefit from 64-bit processors' ability to address more than 4GB of RAM.
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