A new PC that carries the Windows Vista Capable PC logo can run Windows Vista. All editions of Windows Vista will deliver core experiences such as innovations in organizing and finding information, security, and reliability. All Windows Vista Capable PCs will run these core experiences at a minimum. Some features available in the premium editions of Windows Vista—like the new Windows Aero user experience—may require advanced or additional hardware.
A Windows Vista Capable PC includes at least:
-A modern processor (at least 800MHz1).
-512 MB of system memory.
-A graphics processor that is DirectX 9 capable
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.
-Audio output capability.
-Internet access capability.
Does buying a Windows Vista Capable PC mean that I will receive a free upgrade to Windows Vista?
No. A PC that is Windows Vista Capable or Premium Ready means that the PC is ready for an upgrade from Windows XP. You would still need to purchase the edition of Windows Vista that you want to install on your Windows Vista Capable or Premium Ready PC.
Full details available here: http://www.microsoft...dy/capable.mspx
All the tech sites like dell and hp all state that your experience will vary depending on the hardware you have. This specifically applies to the aero interface.