Hardware Secrets has posted an article on the ATI Radeon X1000 Series

ATI is launching today their new series of graphic chips based on a new architecture, which we will be explaining its main features in this article. This new series has basically three families, each one for a distinct market segment: Radeon X1300 for the entry-level market, Radeon X1600 for the mid-range market and Radeon X1800 for the high-end market. In each series there are several models being launched and we will explain each one of them on the following pages.

ATI Radeon X1000 Series Review