We already reported that ATI delayed the RV630, Radeon HD 2600 generation as it had some problems. It turns out that the current samples have some severe problems. Some of the samples have troubles with the 3D engine, while others don't work with HD content.
It is so bad that it instantly pushed ATI back almost two months, as there won't be any RV630 based cards until late June.
We can only say DAAMIT to that too.