ATI was supposed to release its Radeon HD 4850 X2 a card with DDR3 memory and two RV770 chips, but so far there is no direct conclusive order to do so.
This card was supposed to show its face in September and we asked around and it doesn’t look like you will see any of these cards by the end of this month. It is not that we have a lot of September left, as AMD would have only eight days to ship these cards in the current month.
Radeon HD 4870 X2 is obviously selling well and this 2GB DDR5 card is not in any kind of shortage; and ATI probably tactically delayed the slower part with DDR3 memory as it simply doesn't have to sell it today.
We will keep our eyes opened for this interesting card.