Official Microsoft Windows Vista Requirements
There has been a lot speculation lately about what kind of hardware will be required to run Windows Vista on a PC. If you've been asking yourself this question, no need to speculate anymore because a new page has just appeared on Microsoft's website listing the official system requirement for "Vista capable" and "Premium ready" PCs.
Windows Vista Capable PC includes at least: A modern processor (at least 800MHz). 512 MB of system memory. A graphics processor that is DirectX 9 capable.
To get an even better Windows Vista experience, including the Windows Aero user experience, ask for a Capable PC that is designated Premium Ready, or choose a PC that meets or exceeds the Premium Ready requirements described below. Features available in specific premium editions of Windows Vista, such as the ability to watch and record live TV, may require additional hardware.
A Windows Vista Premium Ready PC includes at least: 1 GHz 32-bit (x86) or 64-bit (x64) processor. 1 GB of system memory. A graphics processor that runs Windows Aero. 128 MB of graphics memory. 40 GB of hard drive capacity with 15 GB free space. DVD-ROM Drive3. Audio output capability. Internet access capability.