I dont have the time to do the research but I will say this...
If AMDs new 8 core behaves like the old one did, acting and operating as a 4 core device then I don't care how many gigahertz it runs at.
I love AMD but I drive an intel...Why? Primarly AMDs marketing department and their lack of touch with reality. The old bulldozers were at best equivalant to an i5.
Remember... when building a computer it is the whole package that makes the differance. One great part can help, yes, but it is all about reducing bottlenecks. 5ghz is awesome but if it is on the current FSBs then you will NEVER see the performance difference over the previous generation. One must feed the beast to have a BEAST.