Source : Free On-Line Dictionary of Computing

Pentium II
     
         {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.
     
        {Home (http://www.intel.com/PentiumII/)}.
     
        (1998-10-06)