Memory speed

Terminology in the field of science

Modern computers run around memory, and the performance of memory directly affects the processing capacity of the entire computer system. The memory speed usually refers to its Access speed , for general use Memory access time and Storage cycle To represent.

Memory access time storage Access time refers to the time from starting a memory operation to completing the operation. Memory cycle time refers to two consecutive independent memory operations (for example, two consecutive memory operations Read operation ）The minimum time of the required interval. Generally, the storage cycle is slightly greater than Access time The difference is related to the physical implementation details of the main memory.

Chinese name: Memory speed
Alias: Main memory speed

Description: Access speed
Representation method: Memory access time and Storage cycle express

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Memory Introduction

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Memory

Memory, also known as main memory, is the CPU Direct addressing The storage space is made of semiconductor devices. Memory is characterized by Access speed Come on. Memory is the main part of the computer External storage For. The programs we usually use, such as Windows operating system, typing software, game software, etc., are usually installed on external storage such as hard disk, but their functions cannot be used only for this reason. They must be transferred into memory to run in order to really use their functions. We usually input a paragraph of text or play a game, in fact, they are all in memory. Just like in a study, the bookshelf and bookcase for storing books are equivalent to the external storage of the computer, and the desk we work on is the memory. Usually we put a large amount of data storage In the external storage, some temporary or small amount of data and programs are put on the memory. Of course, the quality of the memory will directly affect the running speed of the computer.

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Memory speed is generally used Access time Measurement, that is, the time spent on data processing between each time and CPU, in nanoseconds (ns). majority SDRAM Memory chip The access time of is 5, 6, 7, 8 or 10ns.

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Main frequency of memory It is traditionally used to indicate the speed of memory, which represents the highest speed that the memory can reach working frequency 。 The main frequency of memory is in MHz（ Megahertz ）It is measured in units. The higher the main frequency of the memory is, to some extent, the faster the memory can reach. The main frequency of the memory determines the maximum frequency at which the memory can work normally.

The clock speed of a computer system is measured in terms of frequency. The crystal oscillator controls the clock speed. When a voltage is applied to the quartz chip, it vibrates in the form of a sine wave. This vibration can be recorded by the deformation and size of the chip. The vibration of the crystal is shown in the form of sinusoidal harmonic changing current, which is clock signal 。 The memory itself does not have crystal oscillator , so the clock signal when the memory is working is determined by Mainboard chipset North bridge of or directly from mainboard Clock generator Provided, that is, the memory cannot determine its own working frequency The actual operating frequency is determined by the motherboard.

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