Everyone knows that memory is very important for computers, but most of them just know what they mean on the surface. If you do n't know what's going on, what is computer memory ? What are the types of computer memory? The following decoration home decoration network Xiaobian will answer for you one by one, I hope to provide help for everyone.
What is computer memory?
Memory is one of the important components in a computer, it is a bridge to communicate with the CPU. All the programs in the computer are running in memory, so the performance of the memory has a great impact on the computer. The computer memory is also referred to as an internal memory, and is used for temporarily storing arithmetic data in the CPU and data exchanged with an external memory such as a hard disk. As long as the computer is running, the CPU will transfer the data that needs to be calculated into the memory for calculation. When the operation is completed, the CPU will transmit the result, and the operation of the memory also determines the stable operation of the computer. The memory is composed of a memory chip, a circuit board, a gold finger, and the like.
What are the types of computer memory?
1. FPM memory: FPM is the abbreviation of Fast Page Mode, which is the earlier PC memory type. It is the memory commonly used in early desktop computers . It transmits data every three clock cycles, but it has long since been eliminated.
2, EDO memory: EDO is the abbreviation of Extended Data Out, which cancels the time interval between the two storage cycles of the motherboard and the memory, and transmits data every 2 clock cycles, greatly shortening the memory. Take time to increase the access speed by 30% to 60ns. EDO memory is mainly used for 72-line SIMM memory sticks and PCI display cards using EDO memory chips. This kind of memory is popular in the 486 and early Pentium computer systems. It has 72 lines and 168 lines. It uses 5V working voltage and 32 bits of bandwidth. It must be used in two or four pairs. It can be used for Intel 430FX/430VX or even 430TX. On the chipset motherboard. It has also been eliminated and can only be seen on some classic machines.
3, SDRAM memory: SDRAM, Synchronous DRAM (synchronous dynamic random access memory), used to be the most widely used memory type on PC computers, even today SDRAM still has a place in the market. Since it is "synchronous dynamic random access memory", it means that its working speed is synchronized with the system bus speed. SDRAM memory is divided into PC66, PC100, PC133 and other specifications, and the number behind the specification represents the maximum working system bus speed of the memory, such as PC100, which means that the memory can be in the computer with the system bus of 100MHz. Work synchronously.
4, DDR memory: Strictly speaking, DDR should be called DDR SDRAM, people used to call DDR, some beginners often see DDR SDRAM, it is considered SDRAM. DDR SDRAM is the abbreviation of Double Data Rate SDRAM, which means double rate synchronous dynamic random access memory. DDR memory is developed on the basis of SDRAM memory, and still uses the SDRAM production system. Therefore, for memory manufacturers, only a small improvement on the equipment for manufacturing ordinary SDRAM can realize the production of DDR memory, which can effectively reduce cost. SDRAM transfers data only once in one clock cycle. It transmits data during the rising period of the clock. DDR memory transfers data twice in one clock cycle. It can transmit data once during the rising and falling phases of the clock. Therefore, it is called double rate synchronous dynamic random access memory. DDR memory can achieve higher data rates at the same bus frequency as SDRAM.
5, RDRAM: RDRAM (Rambus DRAM) is a type of memory developed by the US RAMBUS company. Unlike DDR and SDRAM, it uses a serial data transfer mode. At the time of launch, because it completely changed the memory transfer mode, it could not guarantee compatibility with the original manufacturing process, and the memory manufacturer had to pay a certain patent fee to produce RDRAM, coupled with its own manufacturing cost, which led to RDRAM has been unacceptable to ordinary users since its inception. At the same time, DDR can gradually become the mainstream with lower price and good performance. Although RDRAM has been strongly supported by Intel, it has never become mainstream.
The above is what Xiaobian brought to you. What is computer memory? What are the types of computer memory? I believe that everyone has a basic understanding of what is computer memory after reading this article. If you want to know more about decoration, please click to enter the decoration knowledge channel .
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