Which of the following is used in main memory?

The correct answer is DRAM.

Key Points

• Dynamic Random-Access Memory (DRAM) is a type of random access memory used in most modern computer systems.
  • DRAM stores each bit of data in a separate capacitor within an integrated circuit.
  • Because capacitors leak charge, the information eventually fades unless the capacitor charge is refreshed periodically. This is why DRAM is called "dynamic".
  • DRAM is used in main memory because it is relatively inexpensive and can store large amounts of data.
  • It is slower than Static RAM (SRAM), but its cost-effectiveness and density make it suitable for main memory applications.

Additional Information

• DRAM technology has evolved over the years, with various generations such as DDR (Double Data Rate), DDR2, DDR3, DDR4, and the latest DDR5.
• Each new generation of DRAM provides improvements in speed, power consumption, and data transfer rates.
• DRAM is volatile memory, meaning it loses its data when the power is turned off.
• In contrast, SRAM is faster but more expensive and is typically used for cache memory.