Performance is only part of what is on offer with the Radeon 5000 series products, however. It is becoming increasingly obvious that graphics card development is out-pacing the development of 3D graphics, which is making performance less relevant. ATI is responding by offering a buffet of features.
The most important is full support of DirectX 11. DirectX 11 is only used in a limited number of games currently, but it offers numerous new features which future games will likely incorporate. ATI has also enabled the use of supersampling. Supersampling is a method of antialiasing which samples every pixel in an image multiple times. This is superior to current antialiasing technology, which only samples those areas in an image which correlate with the edge of a polygon. Supersampling offers superior picture quality, but it is also much more demanding on a GPU. Its inclusion is a smart one, as it allows those who are playing older games which already run well a tangible reason to upgrade to a Radeon 5000 series card.
Lastly, there is Eyefinity. Eyefinity is a new technology from ATI which allows a game to be played on multiple monitors. For example, three monitors in a row would greatly extend the field of vision of the player to both the right and left. Placing six displays together would allow for a super-sized screen. While Eyefinity is mostly a publicity stunt - most gamers don't just have 6 screens laying around, nevermind a way of mounting them together - it is an interesting feature to play with.