Both Intel, and AMD's marketing departments don't see the point in changing a product name at every step in the development process, these core names surface only when you are looking very closely at the differences between the performances of two chips; for instance a Celeron 300A, was a much coveted chip during its' time, because it had half the L2 cache of a Pentium 3 which went twice the speed of the 512k of a Pentium 2 300 and as such, did better doing specific tasks while being easily overclockable, and available cheaply.
  • Key:
  • *'s represent a member of the Pentium II family,
  • # represents a member of the Celeron family,
  • @ represents a member of the P3 family
  • $ represents a member of the P-4 family.
    Deschutes  *             .233-500 512K Half speed  66
    Covington     #          .233-1/3   none present  66
    Klamath    *             .450-1   512k half-speed  66
    Mendocino     #          .3-.533  128k full speed  66
    Katmai     *      @      .45-.6   512k full speed  
    Coppermine    #   @      .5-1.133 512k full speed 100, 133
    Tualatin      #   @      
    Willamette    #       $
    Northwood             $
    Northwood "a"         $
    Prescott              $

    CPUs that are both Pentium X, and Celeron have their L2 cache, either reduced or removed to cut costs and to change its' designation to Celeron