Speed of a CPU

The Speed  of a CPU determines the number of  calculations which can be done per second.
The CPU speed is different from the speed of the microprocessor.  The CPU is a part of the microprocessor.

Today, microprocessors have more than one CPU.  Dual core and Quad core processors which contain two and four processors.  The microprocessor speed, therefore, can be more than the processor speed as the CPUs can work in tandem and process calculations.

The speed of the CPU is indicated in GHz (GigaHertz)