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 for Pentium II
From The Free On-line Dictionary of Computing (30 December 2018) :

  Pentium II
  Pentium 2
  
      Intel Corporation's successor to the Pentium
     Pro.
  
     The Pentium II can execute all the instructions of all the
     earlier members of the Intel 80x86 processor family.  There
     are four versions targetted at different user markets.  The
     Celeron is the simplest and cheapest.  The standard Pentium
     II is aimed at mainstream home and business users.  The
     Pentium II Xeon is intended for higher performance business
     servers.  There is also a mobile version of the Pentium II
     for use in portable computers.
  
     All versions of the Pentium II are packaged on a special
     daughterboard that plugs into a card-edge processor slot on
     the motherboard.  The daughterboard is enclosed within a
     rectangular black box called a Single Edge Contact (SEC)
     cartridge.  The budget Celeron may be sold as a card only
     without the box.  Consumer line Pentium II's require a 242-pin
     slot called Slot 1.  The Xeon uses a 330-pin slot called
     Slot 2.  Intel refers to Slot 1 and Slot 2 as SEC-242 and
     SEC-330 in some of their technical documentation.  The
     daughterboard has mounting points for the Pentium II CPU
     itself plus various support chips and cache memory chips.
     All components on the daughterboard are normally permanently
     soldered in place.  Previous generation Socket 7
     motherboards cannot normally be upgraded to accept the Pentium
     II, so it is necessary to install a new motherboard.
  
     All Pentium II processors have Multimedia Extensions (MMX)
     and integrated Level One and Level Two cache controllers.
     Additional features include Dynamic Execution and Dual
     Independent Bus Architecture, with separate 64 bit system and
     cache busses.  Pentium II is a superscalar CPU having about
     7.5 million transistors.
  
     The first Pentium II's produced were code named Klamath.
     They were manufactured using a 0.35 micron process and
     supported clock rates of 233, 266, 300 and 333 MHz at a
     bus speed of 66 MHz.  Second generation Pentium II's, code
     named Deschutes, are made with a 0.25 micron process and
     support rates of 350, 400 and 450 MHz at a bus speed of 100
     MHz.
  
     http://intel.com/PentiumII/)">(http://intel.com/PentiumII/).
  
     (1998-10-06)
  

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