Technological improvements

• CPU :

  • Annual rate of speed improvement is 35% before 1985 and 60% since 1985
  • Slightly faster than increase in transistors

• Memory:

  • Annual rate of speed improvement is < 10%
  • Density quadruples in 3 years.

• I/O :

  • Access time has improved by 30% in 10 years
  • Density improves by 50% every year

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