Originally Posted by DilTech
Sounds like they're trying to clear stock of the x1900xt's and xtx's first.
Either that, or they've fallen into the world that NVidia was in with the 7800GTX 512mb... The memory shortage world. It's a curse that almost always happens when a card uses bleeding edge new ram first, especially if the other company is stockpiling it already for their next card.
It's probably the same reason we haven't heard a release date beyond "september - october" for the G80. GDDR4 is still rather new.