Four cores at 2.66 will be better then two at 3.0

Think about the following (probably lame example):
There is a couple of dudes who can make 3 hamburgers each in one minute. There is also a group of four slackers that only make 2 hamburgers each in one minute.
After one minute the first group made 6 burgers while the second made 8 burgers.

Now I am hungry ...