I was wondering which is the better card.
In the HD 5*** series review by () the HD 4870 X2 is usually faster in most games than the 5850:
It is obvious then that the HD 4870 X2 is the faster card, but the HD 5850 also has several advantages:
Direct X 11 is one of the advantages you have all thought of. However, the only game that supports Direct X 11 at this time is Dirt 2, and it has been announced that direct X 10/10.1 cards can use the main features of Direct X 11 via a driver update.
However, the HD 5850 is about £40 cheaper than the X2, uses up a lot less power, and is a lot cooler, as far as temperatures are concerned. I will also be able to run two 5850's in crossfire with my 800W (4x12V:20A) PSU, when I would need at least a 1000W PSU to run two HD 4870 X2's.
So, in your opinion, which would be the better buy?