What are the classifications of memory modules? How can you tell?

Hello, glad to answer for you.

First of all, the appearance is indistinguishable.

You can only look at the number.

PC5300 is 667 and PC6400 is 800.

The number indicates the frequency.

Hope mine helps.

278834650 qq

1. At present, there are three main types of memory modules:

synchronous dynamic access memory);

Double-speed access memory (DDR);

Bus-based dynamic access memory), SDRAM is now largely obsolete.

Second, the method of identifying the size.

1. Right-click on My Computer -- Enter (Properties).

2. On the right, you can clearly see the memory size of your computer.

3. How to view the model.

Check the model number of your notebook's memory module with the help of hardware detection software

2. Open the run, and then enter the hardware detection interface, here you can see the memory model of the notebook.

In fact, this is an in-memory computing method, and there is a premise that it is based on the relationship between CPUs.

1. The bit width of the CPU data bus is generally 64 bits, and this bit width is called the physical bank.

2. Memory 1rx4 represents one 64-bit, and x4 represents the number of bits of memory per memory particle.

From here, we can easily know that the number of memory particles is: 64 4=16.

If it is 2rx8, the memory particles are: 64*2 8=16 chips, and 2rx4 is 64*2 4=8 chips.

3. Therefore, whether it is 1rx4, 2rx4 or 1rx8, 2rx8, the meaning of the representation can be understood as the number of memory particles of memory, rather than single-sided or double-sided memory.

Depending on how the storage unit works, computer memory RAM is divided into static RAM and dynamic RAM.

1. Static random access memory (SRAM).

The static storage unit is composed of an additional gating tube on the basis of a static trigger. Therefore, it stores data by the self-protection function of the trigger. SRAM stores information that can be retained for a long time without power outage, and the state is stable, and there is no need to refresh the circuitry, thus simplifying the external circuit design.

However, due to the large number of transistors contained in the basic memory circuit of SRAM, the integration level is low and the power consumption is large.

2. Dynamic Random Access Access (DRAM).

DRAM uses the principle of capacitors to store charge and save information, and the circuit is simple and highly integrated. Since there is leakage in any capacitor, when the capacitor has a stored charge, the charge will be lost due to the capacitor discharging over a period of time, and the stored information will be lost.

The solution is to read and re-write the DRAM at certain intervals (2ms), so that the charge discharged on the capacitor that was originally at the logic level "L" is replenished, and the capacitance at the original level "0" still remains "0", this process is called DRAM refresh.

Resolving method: SRAM storage principle: Data is stored by triggers.

Unit structure: six-tube NMOS or OS composition. Pros:

Fast speed, simple to use, no need to refresh, very low static power consumption; It is often used as a cache. Disadvantages: large number of components, low integration, and high power consumption.

DRAM storage principle: the principle that the charge can be stored by using the gate capacitor of the MOS tube, which needs to be refreshed (early: three-tube basic unit; After:

single-tube base unit). Refresh (regeneration): The operation in which the gate capacitor must be charged at regular intervals in order to replenish the missed charge in time to avoid the loss of stored information.

Abstract: A memory module is a computer component that can be addressed by the CPU and can be read and written. When choosing a computer, the capacity of random access memory (RAM) is the key parameter of the memory module.

Generally speaking, the larger the memory capacity, the better the system runs. There are several common memory modules on the market with a total capacity, including 64M, 128M, 256M, 512M, 1G, 2G, etc. What are the types of memory modules?

There are three common types: SDRAM, DDRAM, RDRAM, etc. The total capacity of the memory module is several.

The capacity of the memory is generally a full multiple of 2, such as 64MB, 128MB, 256MB, 512MB, 1GB, 2GB, etc., generally speaking, the larger the memory capacity, the more conducive to the operation of the system. At the beginning of the 21st century, the mainstream memory modules in desktop computers used 2GB or 4GB memory capacity, and 512MB and 256MB memory were rarely used.

What are the types of memory modules?

1、sdram

Synchronous dynamic access to memory is instantaneous, and there are 2 gaps in the middle of the SDRAM memory module (where the row of slots are) for separation, which is basically obsolete.

2、ddram

Double Speed Access Memory, or DDR for short, is based on SDRAM memory, but with 184 pins, 16 more than SDRAM, it contains new control, clock, power, and ground signals.

DDR memory is a macro that transmits data twice in a clock cycle, and it can transmit data once in the rising and falling phases of the clock, so it is called double-rate synchronous dynamic random access memory. DDR memory can achieve higher data transfer rates at the same bus frequency as SDRAM.

3、rdram

The bus-type dynamic access memory is a kind of memory developed by the American company Rambus. Unlike DDR and SDRAM, it employs a serial data transmission mode.

1. As shown in the red line area of the figure below, it is the memory module card slot;

2. If the memory exceeds 4G, it is generally necessary to change to a 64-bit system, and the 32-bit system supports the maximum use of 4G memory, and it will be wasted if it exceeds it.

3. The memory module slots of each version are different, and the motherboard cannot interoperate with EDO, FPM, SDRM, RDRAM, DDR, DDR2, and DDR3 at the same time. Among them, DDR, DDR2, and DDR3 memory are the mainstream of the market.

4. The memory module should be the same as the original memory frequency brand on the computer, and the compatibility is better.

According to the working principle of memory, it can be divided into three categories: read-only memory, random memory, and cache memory.

1. Read-only memory.

At the time of manufacture, information (data or programs) is stored and stored permanently. This information can only be read out, generally not written, and this data will not be lost even if the machine has a power outage.

2. Random access.

RAM means that data can be read or written from it. When the power of the machine is turned off, the data stored in it is lost.

3. High-speed buffer memory.

When the CPU writes or reads data to memory, that data is stored in cache memory.