This is a timeline of milestones in the history Intel Microprocessors. Just listed are the first models, as Intel usually releases updated models with improved clock speeds within a few years of a line's initial launch.

  • i8088 - February 1978
  • i8086 - June 8, 1978
  • i80286 - February 1982
  • i80386DX - October 17, 1985
  • i80386SX - June 16, 1988
  • i80486DX - April 10, 1989
  • i80486SX - April 22, 1991
  • Pentium Classic 60/66 MHz - March 23, 1993
  • Pentium Pro (200, 180, 166, 150 MHz) - November 1, 1995
  • Pentium MMX (200, 166 MHz) - January 8, 1997
  • Pentium II (300, 266, 233 MHz) - May 7, 1997
  • Mobile Pentium MMX (200/233 MHz) - September 8, 1997
  • Mobile Pentium II (233/266 MHz) - April 2, 1998
  • Celeron 266 MHz - April 15, 1998
  • Pentium II Xeon 400 MHz - June 29, 1998
  • Pentium III (450, 500, 550, and 600MHz) - February 26, 1999
  • Pentium III Xeon 500/550 MHz - March 17, 1999
  • Mobile Celeron 333 MHz - April 5, 1999
  • Mobile Pentium III 400/450/500 MHz - Oct. 25, 1999
  • Pentium 4 1.4/1.5 GHz - November 20, 2000