1982 - Intel 286

134,000 transistors
12.5 MHz - clock speed
electrical leads on perimeter

(Electrical leads bring power into the chip and allow information to move in and out to other computer components)

1985 - Intel 386

275,000 transistors
33 MHz - clock speed
electrical leads on perimeter

1989 - Intel 486

1.2 million transistors
50 MHz -clock speed
electrical leads on perimeter

1995 - Pentium Pro

5.5 million transistors
200 MHz -clock speed
electrical leads on perimeter

1999 - Pentium 3

28 million transistors
733 MHz - clock speed
electrical leads directly on chip cover up transistors and other components