sentence: plot of cpu transistor count against dates of introduction ; note the logarithmic vertical scale ; the line corresponds to exponential growth with transistor count doubling every two years an osborne executive portable computer , from 1982 with a zilog z80 4mhz cpu , and a 2007 apple iphone with a 412mhz arm11 cpu ; the executive weighs 100 times as much , has nearly 500 times as much volume , cost approximately 10 times as much ( adjusted for inflation ) , and has about 1/100th the clock frequency of the smartphone '' moore 's law '' is the observation that , over the history of computing hardware , the number of transistor in a dense integrated circuit doubles approximately every two years .