HD 4890 X2 unlikely

Fudzilla: "We have investigated if any of ATI’s partners will actually make an HD 4890 X2 card powered with two RV790 chips and most of them are negating that they plan do make such a card.

With a moderate clock, this card should be possible, it would draw a lot of power as HD4890 has maximal board power of 190W but still a dual card could be possible."