2006 Micron Technology, Inc. All rights reserved.    

 

 

 

 

 

 

Page 3

DDR2: The New DRAM Standard

DDR SDRAM

A year later, in 2000, double data rate SDRAM was introduced. DDR SDRAM,

which provides data on both the rising and falling clock edges, operates at

more than twice the speed of the fastest SDR SDRAM device. This advance-

ment triggered yet another surge in technology upgrades.

DDR2 SDRAM

Second generation DDR SDRAM represents a signi cant advancement. It

achieves extraordinary performance and provides numerous bene ts over

previous DRAM architectures. This technology of the future supports peak

bandwidths in traditional 64-bit wide modules up to 6.4 GB/s. At the com-

ponent level, this equates to an amazing transfer rate of 800 bits per sec-

ond, per pin. Additionally, the newly introduced fully buffered DIMMs (FB-

DIMMs), which use DDR2 components, support peak channel bandwidths

of 9.6 GB/s. With the phenomenal bene ts that DDR2 offers as a high-vol-

ume, cost-effective solution, it is now the memory of choice, displacing DDR

and SDRAM.

SDR

DDR

DDR2

7GB

6GB

5GB

4GB

3GB

2GB

1GB

Technology

512MB/s

6.4GB/s

Figure 1