Dynamic Random Access Memory

Dynamic Random Access Memory

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Dynamic Random Access Memory (DRAM) is a type of memory that is used in most personal computers, as well as in many larger computing systems and devices. The “dynamic” in its name comes from the fact that it needs to be refreshed or given a new electronic charge every few milliseconds to compensate for charge leaks from the capacitors.

Here are a few important things to know about DRAM:

  1. Memory Cells: DRAM stores each bit of data in a separate tiny capacitor within an integrated circuit. The presence of an electric charge in the capacitor represents a binary value of 1, while no charge represents a binary value of 0.
  2. Refreshing: Because the capacitors in DRAM slowly leak their charges, they must be continually recharged or refreshed, typically thousands of times per second. This makes DRAM “dynamic” as opposed to “static” RAM (SRAM) which does not need to be refreshed.
  3. Speed and Cost: DRAM is generally slower than SRAM, but it is also cheaper to produce and uses less power, which makes it a more practical choice for the main system memory in most computers.
  4. Variations: There are many types of DRAM, such as Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM, DDR2, DDR3, DDR4, DDR5), and Graphics DDR SDRAM (GDDR SDRAM, GDDR2, GDDR3, GDDR4, GDDR5, GDDR6), each with its own features and uses.

In summary, DRAM is a crucial part of most modern computers and devices, providing the working space for the CPU to process data. However, it’s also volatile, meaning that it requires power to maintain its information. When the computer is shut off, the data stored in DRAM is lost.

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