4 bytes (+ bits) or 8 bytes (bits)

Computer Systems A Programmer ' s perspective Second Edition

Buses
Running throughout the system is a collection of electrical conduits called buses
That's carry bytes of information back and forth between the components. Buses
is typically designed to transfer? Xed-sized chunks of bytes known as words. The
Number of bytes in a word (the word size) was a fundamental system parameter that
varies across systems. Most machines today has word sizes of either 4 bytes (32
bits) or 8 bytes (bits). For the sake of our discussion here, we'll assume a word
Size of 4 bytes, and we'll assume that buses transfer only one word at a time.

4 bytes (+ bits) or 8 bytes (bits)