We got confirmation that two RV770PRO based R700 will end
up branded as Radeon HD 4850 X2. The partners can do their own designs and this
will mean that there will be at least two variations of the upcoming R700 card.
The top of the line, called Radeon HD 4870 X2 2GB will have 2GB of
GDDR5, the runner up is the Radeon HD 4850 X2 with 2GB of GDDR3.
There will certainly be the price difference between GDDR5
and GDDR3 version of the card and it looks that GDDR3 based Radeon 4850 X2
comes a month later.