Originally Posted by saltynay
Normally on the 2gpus on a single die they downclock the gpus to below standard clocks as there is only one cooler to cool twice the heat. Two in crossfire would have more raw performance and probably cheaper you probably would only need 2gb of graphics memory if your running at higher then 1900x1200 providing you have sufficient system RAM
The 4850X2 has two RV770 chips at the standard core speed of 625mhz just like a single 4850.
Two in xfire would be the same thing. And the 4850's reference design uses a single slot cooler while the 4850X2's is a large dual slot...it should cool extremely well.
Basically an overclocked 4850X2 will match a 4870X2...just gotta get the core clock up to 750mhz
which might be hard to do.