What are Windows 7 Requirements?

Many people are curious about Windows 7 Basic Requirements. Although it has been published many times on internet that what are the minimum system requirements to run the windos 7. These requirements are little different from Windows Vista.
- 1 GHz processor (32- or 64-bit)
- 1 GB of RAM (32-bit); 2 GB of RAM (64-bit)
- 16 GB of available disk space (32-bit); 20 GB of avaiable disk space (64-bit)
- DirectX 9 graphics device with WDDM 1.0 or higher driver
And compare these requirements with Windows Vista which are little different.
- 1 GHz processor (32- or 64-bit)
- 512 MB of RAM (for Home Basic); 1 GB of RAM for all other versions
- 15 GB of available disk space
- Support for DirectX 9 graphics and 32 MB of graphics memory (for Home Basic); 128 MB of graphics memory plus WDDM support for all other versions