Maziar :
Well about 4-way and 3-way CF,do you really need 4-way CF support
?
This was part of my point in an earlier post ("If the UD5 is the same as the UD7 but without the crossfire x4 @ 8 lanes per I can live with that because I'm only going to run a two card crossfire.").
Not to over generalize but, anyone who is planning to cough up the coin to run an X4 CF system isn't going to split hairs over the UD5 & UD7... they are more likely going to be running an full tower with room for the XL-ATX UD7 and liquid cooling and a host of other doodads, gizmos and wigits. Most users will not only not run an X4 CF system but would not see any real benefit from doing so.
Unless you are a high end 3D graphics designer or an engineer who relies on 3D model rendering, a 4X CF system is about as useful as a Ferrari Enzo on your daily commute. Its a great conversation piece at the water cooler but you never really open it up and test its limits. To put a finer point on it, the Ferrari owner isn't even going to consider buying scaled down tires, getting the oil changed at jiffy lube or taking it down to the scratch and dent car wash.
The UD7 is the AM3 elite, its great for showing off but entirely unnecessary and very expensive to keep it properly equipped.