"Moore's Law" actually an axiom says that the number of transistors per square inch in a given integrated circuit will double in some fixed amount of time.
That time originally started out as eighteen months, but has since been pushed back to about every two years.
That has had a corollary effect on performance as well as power consumption.

On 9/18/07 at the Intel Developers Forum in San Francisco Gordon Moore, co-founder of Intel, said he expects his famous law to expire in ten to fifteen years.