g5orbust is somewhat correct. It should be noted that while they are more efficient, it's not just that they don't NEED to be as high of speeds, they simply CAN'T reach the same speeds. It's out of survival thay they have developed different processing using more operations per cycle than Intel so thay can compete. The two are pretty much in dead heat most the time, but I do have to give it to AMD for the low end CPU's as they are cheaper than P4's. Once you start looking at high end CPU's they are about dead even as a Price/Performance.