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What is Random Access Memory? Types of Random Access Memory [RAM]

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What is Random Access Memory? Types of Random Access Memory [RAM] Dynamic RAM (DRAM) Static RAM (SRAM) What is Random Access Memory?

What is Random Access Memory? Types of Random Access Memory [RAM]

What is Random Access Memory

What is Random Access Memory?

RAM(Random Access Memory) is the internal memory of the CPU for storing data, program and program result. It is read/write memory which stores data until the machine is working. As soon as the machine is switched off, data is erased. Access time in RAM is independent of the address that is, each storage location inside the memory is as easy to reach as other locations and takes the same amount of time. 

Random-access memory is the most common type of memory used for a Rapid-Access Memory which is a form of computer data storage that stores data and machine code currently being used.

Data in the RAM can be accessed randomly but it is very expensive. RAM is volatile, i.e. data stored in it is lost when we switch off the computer or if there is a power failure. 

Hence a backup uninterruptible power system(UPS) is often used with computers. RAM is small, both in terms of its physical size and in the amount of data it can hold.

  1. Static RAM (SRAM)
  2. Dynamic RAM (DRAM)


Static RAM (SRAM)


The word static indicates that the memory retains its contents as long as power is being supplied. However, data is lost when the power gets down due to volatile nature. SRAM chips use a matrix of 6-transistors and no capacitors. Transistors do not require power to prevent leakage, so SRAM need not have to be refreshed on a regular basis. Because of the extra space in the matrix, SRAM uses more chips than DRAM for the same amount of storage space, thus making the manufacturing costs higher. So SRAM is used as cache memory and has very fast access.

Characteristic of the Static RAM
  1. It has a long life
  2. There is no need to refresh
  3. Faster
  4. Used as cache memory
  5. Large size
  6. Expensive
  7. High power consumption


Dynamic RAM (DRAM)

DRAM, unlike SRAM, must be continually refreshed in order to maintain the data. This is done by placing the memory on a refresh circuit that rewrites the data several hundred times per second. The DRAM is used for most system memory because it is cheap and small. All DRAMs are made up of memory cells which are composed of one capacitor and one transistor.

  • It has a short data lifetime
  • Need to be refreshed continuously
  • Slower as compared to SRAM
  • Used as RAM
  • Lesser in size
  • Less expensive
  • Less power consumption
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NETechy: What is Random Access Memory? Types of Random Access Memory [RAM]
What is Random Access Memory? Types of Random Access Memory [RAM]
What is Random Access Memory? Types of Random Access Memory [RAM] Dynamic RAM (DRAM) Static RAM (SRAM) What is Random Access Memory?
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