As you might expect, Starter Edition is the most constrained. This Vista version will support 1 32-bit microprocessor and up to 256 MB of RAM. Also the screen resolution will be limited to 1024 x 768 (up from 800 x 600 in XP Starter Edition).
The other editions--Home Basic, Home Premium, Home N, Professional, Professional N, Small Business, Enterprise, and Ultimate Editions--will ship in both 32-bit (x86) and 64-bit (x64) versions (or will support both architectures). All of the home-oriented editions will support 1 processor, while the business-oriented editions (and Ultimate Edition) will support 2.
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