And the 2.5GHz chip you are using now n years later has (very) approximately 2^n more transistors - think about the increase in the number of cores, the large n

And the 2.5GHz chip you are using now n years later has (very) approximately 2^n more transistors - think about the increase in the number of cores, the large number of different execution units, the increased width of the data busses, that vast amount of on-die cache and so on. These all increase the transistor count, but feature size is also getting smaller, allowing the total transistor density to increase in line with Moore's law.