The central processing unit (CPU: Central Processing Unit), or often called a microprocessor. Is responsible for processing the data in the manner of calculation and comparison by runs on the exact timing? Called when a Clock signal is beat one time events can occur 1 time we call the units used to measure the speed of the CPU that "hoet" (Herzt) Meant to work many times in 1 second, such as Pentium4 CPU with speed of 2.5 GHz means working speed 2,500 million times. In one second. In case the signal Clock speed will make it. With high speed. The CPU that is running very fast, very expensive price will be