What is the operating frequency of the CPU's internal clock?

#What is the internal clock operating frequency of the cpu?

CPU frequency is the clock frequency of the CPU. Simply put, it is the abbreviation of the working frequency of the CPU during operation (the number of synchronization pulses that occur in 1 second).

Clock frequency (also translated as: clock frequency speed, English: clock rate) refers to the basic frequency of the clock in a synchronous circuit. It is measured in "several cycles per second" and the measurement unit is the SI unit Hertz. (Hz). It is an important indicator for evaluating CPU performance. Generally speaking, the larger the main frequency digital value, the better. The FSB is the external operating frequency of the CPU and is the base clock frequency provided by the motherboard. The FSB frequency is the data transmission frequency on the Front Side Bus (Front Side Bus) that connects the CPU and the Northbridge chip in the motherboard chipset. There is such a relationship between the main frequency of the CPU and the FSB: main frequency = FSB × multiplier.

CPU main frequency

The main frequency of the CPU is the clock frequency at which the CPU core works (CPU Clock Speed). What is usually said is the GHz of a certain CPU, and this GHz is the "main frequency of the CPU". Many people think that the main frequency of a CPU is its running speed, but this is not the case. The main frequency of the CPU indicates the speed at which the digital pulse signal oscillates in the CPU, and has no direct relationship with the actual computing power of the CPU.

There is a certain relationship between the main frequency and the actual computing speed, but so far there is no definite formula that can quantify the numerical relationship between the two, because the computing speed of the CPU also depends on the performance of various aspects of the CPU's pipeline. Metrics (cache, instruction set, number of CPU bits, etc.). Since the main frequency does not directly represent the computing speed, under certain circumstances, a CPU with a higher main frequency may have a lower actual computing speed.

For example, most of AMD's AthlonXP series CPUs can achieve the higher frequency CPU performance of Intel's Pentium 4 series CPUs at lower clock speeds, so the AthlonXP series CPUs are listed in terms of PR values. name. Therefore, the main frequency is only one aspect of CPU performance and does not represent the overall performance of the CPU. The main frequency of the CPU does not represent the speed of the CPU, but increasing the main frequency is crucial to increasing the CPU's computing speed.

For example, assuming a CPU executes an operation instruction in one clock cycle, then when the CPU runs at a main frequency of 100MHz, it will be twice as fast as when it runs at a main frequency of 50MHz. Because the 100MHz clock cycle takes up half the time compared to the 50MHz clock cycle, that is, the time required for a CPU working at a 100MHz main frequency to execute an operation instruction is only 10 ns, which is half shorter than the 20 ns when working at a 50 MHz main frequency. Natural computing The speed is twice as fast.

It’s just that the overall running speed of the computer not only depends on the CPU computing speed, but also is related to the operation of other sub-systems. Only when the main frequency is increased, the running speed of each sub-system and the relationship between each sub-system Only when the data transmission speed of the computer can be improved can the overall running speed of the computer be truly improved.

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