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To make sure that PC owners are ready for Vista, Microsoft is making an official announcement of the final Vista Tech specs today at windowsvista.com/getready. EWeek has the details of MSFT announcement beforehand:
Microsoft is expected to label a PC as Vista Capable if it has an 800MHz processor, 512MB of RAM, and a DirectX9 capable graphics processor.
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 - a 1GHz processor, 1GB of RAM and 128MB of dedicated graphics memory, along with a graphics processor that meets numerous requirements.
Microsoft to Offer Vista Specs, Hardware Guidelines