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Laptop memory – What is RAM Constructed how How is the function

Laptop memory – What is RAM?

RAM (Random Access Memory) is a type of variable memory that allows random reading and writing of data to any location in memory based on the memory’s address. All information stored in RAM is temporary and will be lost when there is no power supply.
Structure of RAM

– Motherboard


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This is a circuit board that includes all the components of the RAM, which are connected between the memory components and the computer by a silicon semiconductor circuit.

– Processor

Unlike traditional (asynchronous) DRAM, SDRAM memory operations are synchronized with the microprocessor to simplify the control interface and eliminate unnecessary signal generation.

Memory Group

This is the component with the data storage modules. In SDRAM, there are always two or more memory banks, allowing one of them to have access to the others.

– Chip SPD

SDRAM has an on-board SPD (Serial Presence Detection) chip that contains information about memory type, size, speed, and access time. This chip allows the computer to access this information at boot time.


The on-chip counter tracks column addresses for high-speed cluster accesses. It uses two types of clustering, sequential and interleaved.

3. 3. How RAM works

In telephones and computers, RAM is used to coordinate with computer memory to control, access, and use data. At this point, the CPU transfers data from the drive to RAM for temporary storage, and when the user closes the application or shuts down the computer, the area of memory occupied on RAM is returned.

Based on the function of RAM, it is classified into 2 types. SRAM and DRAM.

– SRAM, also known as Static RAM (Static RAM), this type of RAM does not lose its contents after loading unless the computer is booted and it is applied to store boot data.

– Unlike SRAM, DRAM is used to temporarily store data while running an application and can be returned to memory when the application is closed or when the phone or computer is shut down or turned off.

4. Classification of laptop memory

There are 2 types of RAM, SRAM and DRAM. SRAM is also known as Static RAM (Static RAM) This type of RAM does not lose its contents after loading unless the computer is booted and it is suitable for storing initial data, motion.

Unlike SRAM, DRAM (Dynamic RAM) is used to store data temporarily while running an application and can be returned to memory when the application is closed or when the phone or computer is shut down or turned off.

Types of Dynamic RAM.

– SDRAM (short for Synchronous Dynamic RAM). Also known as synchronous RAM.

– DDR (Double Data Rate SDRAM). an improved version of SDR with 184 pins, still used by very few computers.

– DDR2. As an upgraded version of DDR, DDR2 has 240 pins and is significantly faster and is now used in older computers.

– DDR3. This ram is widely used and has high speed.

– RDRAM (Rambus Dynamic RAM): Often referred to as bus RAM, it is made according to a completely new technology compared to the previous generations.

– DDR4: Born in 2014, it replaced DDR3 and upgraded from 2133-4266MHz in terms of transfer speed, using a lower voltage of 1.2V. in addition, DDR4 memory is also more expensive than DDR3.

5. Meaning of RAM

A computer’s RAM (Random Access Memory) or Random Access Memory is used as a temporary storage place for data and executable instructions for the operating system and applications, which are then written to the hard disk at the end of Work.

If the system does not have enough RAM to meet the requirements, the operating system will turn to virtual memory, which is part of the hard disk and serves as a place to exchange data.

6. The meaning of the parameters about RAM

DDR3 SDRAM (abbreviated as DDR3). Based on the design of SDRAM (Synchronous Dynamic Random Access Memory), it uses clock signals to synchronize everything.

DDR stands for Double Data Rate – which means that two blocks of data can be transferred in one clock, so the data transfer rate is twice as fast.

Capacity. It is the amount of information that can be stored in RAM. Depending on the RAM, there are different types of capacities, such as. 2GB, 4GB, …

ECC (Error Checking and Correction). This is a basic component of current server systems.

Bus: Consists of many small electrical conductors, it is a corridor system that conducts data from various parts of the computer (CPU, memory, IO devices).

CAS (Column Address Strobe), also known as Latency. is the calculation of the time it takes to transfer from the command line to the RAM stick and respond to the CPU.

Refresh Rate. Server RAM is made up of hundreds of electronic cells, each of which must be charged thousands of times per second, because otherwise the data contained therein would be lost. Therefore, dynamic memory needs to have a reloading process, a process we usually call “refresh”.

7. Factors to consider when choosing RAM

Type of RAM

When choosing RAM, you must know what type of RAM the laptop uses, what its bus is, and whether it is supported by the motherboard (host board).

– The amount of RAM

If you want to install 4GB of RAM, you should install 2 sticks of RAM, each of the same type of 2GB, not 4GB sticks. Your choice of 2-4GB of RAM capacity depends on the operating system and the programs you need to use.

8. How much RAM is enough to choose?

Today, laptops are usually equipped with

The minimum level of RAM (2 GB) is only suitable for tasks such as web browsing, email, watching videos or playing some light games. 4GB RAM is the amount of RAM that a Windows or OS X laptop can meet the needs of most users today.

In summary, 8 GB of RAM will meet most users’ needs, and if the amount of RAM is larger than these numbers, it is usually to satisfy some user’s passions such as playing 3D games or doing graphics, planning. math with spreadsheets with large numbers,…

9. Answer some questions

– What is the RAM bus?

The RAM bus can be understood as the size of the data transmission channel inside RAM, the larger the bus of RAM, the more data traffic is processed.

– What is the amount of RAM?

The large amount of RAM cannot confirm whether the device is smooth or not, but it depends on many factors such as a well-optimized operating system, the amount of RAM does not need to be too large.


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