Hardware Secrets posted an article on AMD's ATI Radeon HD 2000 Series Architecture

AMD is announcing today its new ATI Radeon HD 2000 Series. This is the first series from AMD/ATI featuring DirectX 10 and five desktop models were announced: Radeon HD 2900 XTX for the high-end market (previously known by its codename, R600), Radeon HD 2600 Pro and XT for the mid-range market and Radeon 2400 Pro and XT for the low-end market. While Radeon HD 2900 XTX can be found on the market starting today, the other models are just “paper launches”, as they will be released by the end of June, with no specific date set yet. In this article we will explore the details of the new architecture brought by this new series.

AMD ATI Radeon HD 2000 Series Architecture