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2 definitions found
 for Pentium
From The Jargon File (version 4.4.7, 29 Dec 2003) :

      The name given to Intel's P5 chip, the successor to the 80486. The name was
      chosen because of difficulties Intel had in trademarking a number. It
      suggests the number five (implying 586) while (according to Intel)
      conveying a meaning of strength ?like titanium?. Among hackers, the plural
      is frequently ?pentia?. See also Pentagram Pro.
      Intel did not stick to this convention when naming its P6 processor the
      Pentium Pro; many believe this is due to difficulties in selling a chip
      with ?hex? or ?sex? in its name. Successor chips have been called Pentium
      II, Pentium III, and Pentium IV.

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

      Intel's superscalar successor to the 486.
     It has two 32-bit 486-type integer pipelines with dependency
     checking.  It can execute a maximum of two instructions per
     cycle.  It does pipelined floating-point and performs
     branch prediction.  It has 16 kilobytes of on-chip
     cache, a 64-bit memory interface, 8 32-bit general-purpose
     registers and 8 80-bit floating-point registers.  It is
     built from 3.1 million transistors on a 262.4 mm^2 die with
     ~2.3 million transistors in the core logic.  Its clock rate
     is 66MHz, heat dissipation is 16W, integer performance is 64.5
     SPECint92, floating-point performance 56.9 SPECfp92.
     It is called "Pentium" because it is the fifth in the 80x86
     line.  It would have been called the 80586 had a US court not
     ruled that you can't trademark a number.
     The successors are the Pentium Pro and Pentium II.
     The following Pentium variants all belong to "x86 Family 6",
     as reported by "Microsoft Windows" when identifying the CPU:
      Model  Name
      1      Pentium Pro
      2      ?
      3      Pentium II
      4      ?
      5, 6   Celeron or Pentium II
      7      Pentium III
      8      Celeron uPGA2 or Mobile Pentium III
     A floating-point division bug
     ftp://ftp.isi.edu/pub/carlton/pentium/FAQ)">(ftp://ftp.isi.edu/pub/carlton/pentium/FAQ) was discovered in
     October 1994.
     [Internal implementation, "Microprocessor Report" newsletter,
     1993-03-29, volume 7, number 4].
     [Pentium based computers, PC Magazine, 1994-01-25].

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