A small comparison in number and you'll notice the EVGA Dual Classified and a bit faster than the EVGA Superclocked.
Hower the Dual Classified has some goodies like 14+3 Phase Power, Dual BIOS and Dual 8Pin Power input.
Rendering the Dual Classified obsolete of the two.
In simple terms.. The Evga Dual Classified is the best of the two