Difference between DDR2 and DDR3 memory

  • Posted on April 5, 2007
  • /Under Hardware

DDR2

  • Operate at 400MHz to 800MHz.
  • operates at 1.8V
  • 4 internal banks used
  • based on “T branches” conventional topology
  • (OCD) off-chip driver calibration
  • can not deal with termination impedance
  • popular in industry.
  • No Thermal Sensor

DDR3

  • Operate at 800MHz to 1666 MHz. This will reduce read and write time to just half of the DDR2 memory.
  • operates at 1.5V
  • 8 internal banks used
  • initialization process uses new Mode Registers (MRS) are re-engineered for quicker configuration of the memory system.
  • based on “Fly-by” topology
  • Self calibration with automatic leveling circuit
  • can deal with termination impedances
  • It will take time to be as mainstream memory
  • Optional Thermal sensor

Written by Hemant Patel

Hemant, hailing from Bhopal, Madhya Pradesh, India, is a web developer and occasional blogger passionate about exchanging ideas and addressing problems in his coding journey.