http://www.bit-tech.net/news/2005/05...ox_360_london/
ATI revealed this afternoon that every single Xbox 360 game will be required to run at a minimum of 720p resolution with 4x Anti-Aliasing.
The technology fulfills all the criteria of Windows Graphics Foundation 1.0, aka DirectX 9.0c, which includes Shader Model 3.0. However, it lacks features which are required for WGF 2.0, most notably the ability to create vertices, rather than just shade and manipulate them.
Whilst the architecture of the 360 is not comparable to a PC design, Rene said that the raw performance would be roughly equivalent to a 32-pipeline PC graphics card.