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Different types of Random Access Memory (RAM) | why we use that ?

Random Access Memory (RAM)

RAM

This is the memory that the computer uses for storing the programs and their data while working on them So, if you are drafting a letter using a word processor,sayMS-Word, you are working with a document loaded into the RAM. Tostore your letter for later use, it has to be saved on the hard disk. Later, you can retrieve it from the disk and continue working on the document. Thus, RAM function as a scrtch pad for the computer and is sometimes called the scratch pad memory.

RAM has the following characteristics:

Data within the RAM cn be read or modified, i,e. you can either read from theRAMor write onto it. Hence it is called read/write memory.
The contents of the RAM are lost when the computer is switched off. Hence, the RAM is said to be volatile.

The capacity of RAM depends on the number of memory chips installed, which in turn depends on the capacity the microprocessor can handle.The RAM size is an important parameter in determining the sizeand complexity of problems that a computeter can handle.When people refer to the amount of memory that a computer has, they are talking about the amount of RAM available.

Types of RAM

There are various types of RAM that are currently avilable for use. You can select any of them according your requirements:

(1) Double Data Rate:

Double Data Rate RAM

The Double Rate (DDR) is the current standard for RAM and it offers more bandwidth than the older standard, such as SDRAM. DDR is only available on more modern motherbords right now. You should check your motherboard's compatibility with DDR prior to purchasing it.

(2) RDRAM:

RDRAM RDRAM RDRAM

Rambus Dynamic RAM (RDRAM) is avaible only with certain Pentium IV systms at this time, or some Pentium III systems. RDRAM is not used with the AMD Duron or the AMD AthlonXP processors. Using RDRAM and DDR memory, you can get high speed and performance, but these are more expensive.

(3) SDRAM:

SDRAM SDRAM SDRAM SDRAM