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Upgrading and Repairing PCs (21st Edition)
Upgrading and Repairing PCs (21st Edition), by Scott Mueller (Que Publishing), starting at $33.88
Home » Memory
Everything You Need To Know About DDR, DDR2 and DDR3 Memories
Author: Gabriel Torres
Type: Tutorials Last Updated: August 27, 2009
Page: 2 of 7
Speeds

One of the main differences between DDR, DDR2 and DDR3 is the highest transfer rate each generation can reach. Below we list the most common speeds for each generation. Some manufacturers can deliver memory chips capable of achieving other speeds than those listed; for example, specialty memories targeted to overclockers. Clocks ending in 33 and 66 MHz are, in fact, periodic decimal expansions (33.3333 and 66.6666, respectively).

Memory

Real Clock

Maximum Theoretical Transfer Rate

Memory Module

DDR200

100 MHz

1,600 MB/s

PC-1600

DDR266

133 MHz

2,133 MB/s

PC-2100

DDR333

166 MHz

2,666 MB/s

PC-2700

DDR400

200 MHz

3,200 MB/s

PC-3200

DDR2-400

200 MHz

3,200 MB/s

PC2-3200

DDR2-533

266 MHz

4,266 MB/s

PC2-4200

DDR2-667

333 MHz

5,333 MB/s

PC2-5300

DDR2-800

400 MHz

6,400 MB/s

PC2-6400

DDR2-1066

533 MHz

8,533 MB/s

PC2-8500

DDR3-800

400 MHz

6,400 MB/s

PC3-6400

DDR3-1066

533 MHz

8,500 MB/s

PC3-8500

DDR3-1333

666 MHz

10,666 MB/s

PC3-10600

DDR3-1600

800 MHz

12,800 MB/s

PC3-12800

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