Geek.com has a great article on why not all processors are created equal. It’s worth reading. Take a look.
Geek.com : “…for an Intel processor to add A to B and store the result in A, it has to do 20 or 31 things. For AMD to complete the same workload, the processor only has to do 12 things.
This is why an AMD chip operating at 2.8GHz processes data faster than an Intel chip running at 4.0GHz. Even though the Intel chip is going faster in MHz, it is doing less work per clock cycle. This results in more clock cycles being required to produce the same results, and therefore its net output is something less than the MHz value alone would indicate.”