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Lectures
Of all cpus in use, Risc is more common

SPARC (Sun) 32/64-bit, 31 registers plus always zero R0, current use
Alpha (DEC) - 32/64-bit, 31 registers plus always zero R31, 1992-2001
PowerPC (IBM) - 32/64-bit, 32 registers, current use
Itanium (Intel) 32/64-bit, 31 registers plus always zero R0, current use
MIPS (MIPS) - 32/64-bit, 32 registers, current use
ARM (ARM) - 32/64-bit, 16 registers, current use


Autombiles - up to 50 cpus.
  auto.howstuffworks.com/under-the-hood/trends-innovations/car-computer.htm 
E-readers
Tablets
Cellphones
Microwaves
Modem-routers
Network switches
Highend servers
Playstation 1994-2006
Nintendo 64
Intel PowerPC series -  
  Mid-level systems
  Macs 1994-2006
Super-computers (multiple cpus in parallel).
  Paired with graphical processing units (math co-processors).