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 Bala Krishna

Bala Krishna is web developer and occasional blogger from Bhopal, MP, India. He like to share idea, issue he face while working with the code.