Fudzilla wants to have learned, that the Radeon HD 4850 X2 will not be released before September.
AMD Radeon HD 4850 X2: It seems like there won’t be big differences to the HD 4870 X2. (picture: Anandtech)
The "little" X2 will, just like the single GPU version, use the RV770 Pro chip and GDDR3 video memory. According to this, the card is likely to have the same clock speeds as the HD 4850. Regarding the memory AMD is generous - the HD 4850 X2 is said to have 2,048 MiByte VRAM (1 GiByte per GPU), just like the HD 4870 X2. The price is said to be aimed at a level of about $100 below the big sister, so it should be about 449 US-Dollar.
In some preview tests the HD 4870 X2 was said to deliver a good performance. If Crossfire is working properly, the card is able to outclass a Geforce GTX 280. So it might be possible, that the HD 4850 X2 is able to beat Nvidia's flagship as well.