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There are lots, too many to name. Some of the popular ones are:

EDO (Obsolete)SDRAM (Mostly Obsolete)

RAMBUS (Obsolete) - Data transfers fast, but takes a long time to find. Only used on P4 systems.

DDR/DDR2/DDR3 - Current technology. Basically a pumped up version of SDRAM

GDDR2 - An early version of DDR2, only used on graphics cards.

AnswerDynamic Random Access Memory(DRAM):-
  • cotents are constantly refreshed 100times per second.
  • Access time 60-70 nanoseconds.
  • a nano second is equal to 1billionth of a second.

synchorus dynamic random access memory(SDRAM):-

  • quicker than DRAM
  • access time than 60seconds.

Direct rambous Dynamic Random Access Memory(DRDRAM):-

  • new type of ram architecture.
  • access time is 20times faster than DRAM.
  • more expensive.

Static random access memory(SRAM):-

  • doen't need refreshing.
  • retains contents as long as power applied to the chip.
  • access time is arround 10seconds.
  • used for cache memory.
  • also data and time settingsas powered by small battery.

Cache memory:-

  • small amount of memory typically 256 or 512 kilobytes.
  • temporary storage for often used instructions
  • CPU checks to see whether the next instructions it requires in cache.
  • if not the CPU has to fetch next information from the main memory.

Video random access memory:-

  • holds the data that can b displayed on the computer.
  • Has two data paths allowing to READ & WRITE to occur at same time
  • a graphics card may hav its own VRM chip on board.

virtual memory:-

  • uses backing storage

eg:-harddisk

  • virtual memory is much slower than the ram.
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13y ago

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