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

Pentium Pro

    (Known as "P6" during development) Intel's
   successor to the Pentium processor, in development Jan 1995,
   generally available 1995-11-01.  The P6 has an internal
   RISC architecture with a CISC-RISC translator, 3-way
   superscalar execution, and out-of order execution (or
   "speculative execution", which Intel calls "Dynamic
   Execution").  It also features branch prediction and
   register renaming, and is superpipelined (14 stages).

   The P6 is made as a two-chip assembly: the first chip is the
   CPU and 16 kilobyte first-level cache (5.5 million
   transistors) and the other is a 256 (or 512) kilobyte
   second-level cache (15 million transistors).  The first
   version has a clock rate of 133 Mhz and consumes about 20W
   of power.  It is about twice as fast as the 100 MHz Pentium.
   The original 0.35 micron versions of the Pentium Pro released
   on 1995-11-01 run at 150 and 166 Mhz for desktop machines and
   up to 200 Mhz for servers.  Heat disspation is about 20
   Watts.

   The Pentium Pro is optimised for 32-bit software and runs
   16-bit software slower than the original Pentium.  The
   successor was the Pentium II.

   [Performance?]

   (1996-03-01)