RAM of Computer.

 RAM (Random Access Memory) is the internal memory of the CPU for storing data, program, and program result. It is a read/write memory which stores data until the machine is working. As soon as the machine is switched off, data is erased.

RAM is of two types −

• Static RAM (SRAM)
• Dynamic RAM (DRAM)

  Static RAM (SRAM)

  The word static indicates that the memory retains its contents as long as power is being supplied SRAM chips use a matrix of 6-transistors and no capacitors. Transistors do not require power to prevent leakage, so SRAM need not be refreshed on a regular basis.

• . 

  Characteristic of Static RAM

  • Long life
  • No need to refresh
  • Faster
  • Used as cache memory
  • Large size
  • Expensive
  • 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. DRAM is used for most system memory as it is cheap and small.

    Characteristics of Dynamic RAM

    • Short data lifetime
    • Needs to be refreshed continuously
    • Slower as compared to SRAM
    • Used as RAM
    • Smaller in size
    • Less expensive
    • Less power consumption