The Pentium:
The Pentium, introduced in 1993, retains the 32-bit address bus of the 80486 but doubles the data bus 64 bits. The Pentium retained the 32 bit registers of the 486 but made it possible to deal with the 64 bit data bus by adding a second execution unit. The Pentium also has two 8-K bytes cache memories, one for instructions and for data. The original Pentium operated at a clock frequency of 60 MHZ or 233 MHZ.
