Here is what I got from the windows vista website...
Windows Vista Premium Ready PCs
To get an even better Windows Vista experience, including the Windows Aero user experience, ask for a Windows Vista 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) processor1.
* 1 GB of system memory.
* Support for DirectX 9 graphics with a WDDM driver, 128 MB of graphics memory (minimum)2, Pixel Shader 2.0 and 32 bits per pixel.
* 40 GB of hard drive capacity with 15 GB free space.
* DVD-ROM Drive3.
* Audio output capability.
* Internet access capability.
If a PC is Windows Vista Premium Ready it delivers an even better experience than a Windows Vista Capable PC. PCs meeting the Windows Vista Premium Ready requirements can deliver the Windows Aero user experience that includes additional benefits:
* Improved productivity (real-time thumbnail previews, new 3-D task switching, interface scaling),
* Enhanced visual quality (glitch-free window redrawing), and
* Visual style (translucent window frames and taskbar, enhanced transitional effects)
A GPU that supports the Windows Driver Display Model (WDDM) is an important part of the Windows Vista Premium Ready requirements. A list of GPUs that support WDDM can be found in this
Tech Net Article .
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