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Hardware Requirements
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Official Microsoft Hardware Requirements, these are subject to change at anytime and without notice... Also this is for the 2006 release of Vista not the Premium version to be released in 2007. The Premium verson though a funny name for an OS will include WinFS and many other features that will not make it in the 2006 verson.
Desktop CPU: 3 GHz Intel Pentium 4 processor with Hyper Threading Technology 530 (or higher) or 3 GHz Intel Xeon processor with 2 MB L2 cache, or AMD Athlon 64, Sempron, or Opteron 100, 200, or 800 processor, single or dual-core versions.
Mobile CPU: 1.86 GHz Intel Pentium M processor 750 (or higher), or AMD Turion 64 Mobile Technology, Mobile Sempron, or Mobile Athlon 64 processor.
RAM: 512 MB of RAM or more, all platforms.