Windows Vista Min System Specifications

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For those who wish to take advantage of all of Vista's new features and run a full-blown version of the forthcoming OS, a so-called Premium Ready PC will require at least a 1GHz processor, 1GB of main memory and 128MB of graphics memory, along with a graphics processor that meets numerous requirements, those familiar with the plan said.

eWEEK.com Special Report: Windows Vista: Microsoft's Longhorn Client

To be sure, Vista will run on most PCs produced in the last several years. So-called Vista Capable PCs, Microsoft is expected to say, will require an 800MHz processor, 512MB of RAM, and a DirectX9 capable graphics processor, the sources said.

Most recent PCs meet Vista Capable requirements. But in order for Vista to display its most advanced features, namely its three-dimensional Aero interface, a PC must meet Microsoft's Premium Ready guidelines, the sources said.

From Here

http://www.eweek.com/article2/0,1895,1963813,00.asp