Radeon HD 2900XT is the top product that ATI plans to release on the 14th of May. There won't be any Radeon HD 2900XTX cards, at least not on the 14th of May. ATI will also launch Radeon HD 2600 XT and Radeon HD 2600 PRO as its performance cards for the mainstream market. These cards are based on the delayed RV630 chip, so this will be a typical paper launch.
Dell, FSC and HP might have some of these cards, but almost none of the Add in Board partners will be able to ship any HD 2600 or 2400 cards in May. They should get some cards by the end of June.
The Radeon HD 2400 comes in XT and PRO flavors. ATI Radeon HD 2400 XT is based on the RV610 Pro, while the ATI Radeon HD 2400 PRO, is based on the RV610 LE .
Well done ATI, after months of delays all the company can do is launch a weak high end chip and furhter delay the parts that might have a fighting chance, almost two months after Nvidia launched its own cards.