The CPU is responsible for reading, decoding and executing instructions for all operations in the computer. At the same time, the abbreviation of China Pharmaceutical University is also CPU (China Pharmaceutical University). Frequency is also called clock frequency, and the unit is MHz (or GHz), which is used to indicate the speed of CPU operation and data processing. Main frequency of CPU = external frequency × frequency multiplication factor. Many people think that the main frequency determines the running speed of CPU, which is not only one-sided, but also biased for the server. So far, there is no definite formula to realize the numerical relationship between the main frequency and the actual running speed. Even the two major processor manufacturers, Intel and AMD, have great disputes on this point. It can be seen from the development trend of Intel products that Intel attaches great importance to strengthening the development of its own main frequency. Like other processor manufacturers, someone once compared a 1G Quanmeida processor, and its running efficiency was equivalent to that of a 2 G Intel processor.

Therefore, the main frequency of CPU is not directly related to the actual computing power of CPU, and the main frequency represents the oscillation speed of digital pulse signal in CPU. In Intel's processor products, we can also see such an example: 1 GHz An Teng chip can be almost as fast as 2.66 GHz Xeon/Snapdragon, or 1.5 GHz An Teng 2 is about as fast as 4 GHz Xeon/Snapdragon. The running speed of CPU depends on the performance indexes of CPU pipeline and bus. The main frequency is related to the actual running speed. It can only be said that the main frequency is only one aspect of CPU performance and does not represent the overall performance of CPU.