ATI Radeon HD 5770 and HD 5750 in CrossFireX Configurations
 

The question is if pairs of Radeon HD 5770 and 5750 cards in CrossFireX mode are going to be faster than a Radeon HD 5870 and HD 5850, respectively? Won’t the narrow 128-bit memory bus be a bottleneck? What pitfalls should be expected by a user who wants to build a graphics subsystem out of two junior graphics card models? I will try to give you the answers in this review.

http://www.xbitlabs.com/articles/vid...rossfirex.html