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not exactly. try to think of it as a road and the cars are the info


a single core is like a dual lane highway at say 100mph

a dual core at half the freq would be like a quad lane freeway at 50mph.

not the greatest analogy but i hope you kinda get the point

however, there are a LOT of other facotors though when determining the speed of a computer such as fsb, ram, etc
 
this is a touchy subject. if an application or the OS, OS X "IS" Multicored in the code, and you have a multicore cpu, itll be faster than a single core. because it can distribute the processes between processors. also, it helps with multitasking because you can be running more apps at once because you have two processors.
 
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