Please check the link below to get official guide in what exactly is VISTA’s requirement.
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.
Get Feeded here :Windows Vista Capable and Premium Ready PCs
Vista’s Feature :Aero Feature Let me know how many of them are requirment of daily use at the cost of Hardware.