As we pack more transistors into a tiny silicon chip, the cost
of building a microprocessor "fab, " short for fabrication plant,
will get more expensive. Mr. Arthur Rock comes up with his
own law based on Moore's Law.
"A very small addendum to Moore’s Law is
Rock’s Law which says that the cost of capital equipment to
build semiconductors will double every four years."
The equation for Rock’s Law is:
Cn = Co ´ 2n
Co = cost at the beginning year
Cn = cost in the future ‘nth’ year
n = (number of years from the beginning year to the 'nth'
The cost of building a 386-microprocessor fab was estimated to
be about $500 million in 1988. How much would a Pentium II plant
cost in 1997?
Cn = $500 million ´
= $500 million ´4.76
= $2.378 billion
What would a new fab cost for the Intel Micro 2012
microprocessor in year 2012?
Estimate the answer:
than $2 billion
Between $2 and $5 billion