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History of Intel Processors
1984:  Intel 80286 – 134,000 transistors; 6-12 MHz
1987:  Intel 80386 – 275,000 transistors; 16-33 MHz
1989:  Intel 486 – first processor with 1 million transistors on it; 25-100 MHz
1993:  Pentium – 3.3 million transistors; 75-200 MHz
1997:  PII – 7.5 million transistors; 234-450 MHz
1999:  PIII – 9.5-28 million transistors; 400 MHz – 1.2 GHz
2000:  PIV – 42 million transistors; 1.4 GHz
2002:  PIV – 55 million transistors; 2.4 GHz
2003:  PIV – 80 million transistors; 3.2 GHz
2002:  Pentium M (Centrino) – 77 million transistors; up to 1.6 GHz