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

  clock rate
  clock frequency
  clock speed
      The fundamental rate in cycles per
     second at which a computer performs its most basic operations
     such as adding two numbers or transfering a value from one
     register to another.
     The clock rate of a computer is normally determined by the
     frequency of a crystal.  The original IBM PC, circa 1981,
     had a clock rate of 4.77 MHz (almost five million
     cycles/second).  As of 1995, Intel's Pentium chip runs at
     100 MHz (100 million cycles/second).  The clock rate of a
     computer is only useful for providing comparisons between
     computer chips in the same processor family.  An IBM PC
     with an Intel 486 CPU running at 50 MHz will be about
     twice as fast as one with the same CPU, memory and display
     running at 25 MHz.  However, there are many other factors to
     consider when comparing different computers.  Clock rate
     should not be used when comparing different computers or
     different processor families.  Rather, some benchmark should
     be used.  Clock rate can be very misleading, since the amount
     of work different computer chips can do in one cycle varies.
     For example, RISC CPUs tend to have simpler instructions
     than CISC CPUs (but higher clock rates) and pipelined
     processors execute more than one instruction per cycle.

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