Nvidia GeForce GTX 480 Graphics Card in comparison to ATI Graphics Card

Hello there experts!
The new graphics card that is recently launched by NVIDIA is said to have a very high performance and more better than many other graphics cards in the market.
Can anyone tell me what are the new features and specifications that have made this graphics card earn this fame of being exceptional? In addition to that, please compare between the latest graphics card of ATI and suggest which is better.
