DDR2-ProductIndustrial DDR2 SDRAM improvements over first gen. DDR included: reduced clock speed  resulting in higher bus speed. Operating voltage was reduced from 2.5 volts to 1.8 volts to reduce power consumption and facilitate the use of smaller semiconductor fabrication processes. DDR2 generation also saw the introduction of additional form factors as listed below.

Virtium contributed to the advancement of the DDR2 generation with the development of ECC VLP RDIMM targeted at AdvancedTCA applications.


Densities 1GB, 2GB, 4GB, and 8GB
Form Factors DIMM, SODIMM and Mini-DIMM
Height Standard, VLP and Blade VLP
Type Registered or Unbuffered
Error Correction  ECC or non-ECC
Speed PC2-6400, PC2-5300, PC2-4200 and PC2-3200
Data Transfer Speed (MT/s) 800, 667, 533 and 400
Voltage 1.8 VDC
Standard Temp.  0°C to 85°C
Extended Temp. -25°C to 95°C
Industrial Temp. -40°C to 95°C
Configuration x8 and x4
Rank Single, Dual and Quad
Warranty 5 Years