What term is used to describe the operating speed of the CPU?

• A. Bus speed
• B. Throughput
• C. Clock
• D. Bandwidth

Answer: (C)

The operating speed of the CPU is described by its clock. The clock provides the timing signal that drives each cycle the processor executes, and its rate (measured in hertz, typically gigahertz today) indicates how many cycles per second the CPU can perform. In practice, more cycles per second usually mean more instructions can be completed each second, though real performance also depends on architecture, caches, and memory. The other terms refer to different ideas: bus speed is about data transfer on the system bus, throughput is how much work gets done per unit time, and bandwidth is the maximum data transfer capacity of a channel. So the term that best matches the CPU’s operating speed is the clock.