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DDR (Double Data Rate DRAM) memory is similar to the older SDRAM technology, but it significantly improves its capabilities in one way. SDRAM transfers data at every rising edge of the clock signal. DDR transfers data at both edges of the clock signal, allowing a double rate of transmission speed. This allows DDR memory to operate at speeds at least twice that of older SDRAM devices.
Current DDR speeds are PC3200, PC2700, PC2100 and PC1600, also known as PC400, PC333, PC266 and PC200. This refers to the module's speed in MHz.
The industry expects to shift mass production to DDR-II in 2005. The DDR-II standard will support much higher frequencies, starting at 533 MHz.
| DRAM | About SRAM |
| About DRAM | About Flash Memory |
| About EDO/FPM | About Embedded Memory |
| About SDRAM | About Optical Memory |
| About DDR | |
| About Rambus | |
| About FCRAM |
Other articles in this series:
How to repair RAM
Selecting a memory tester
Types of Memory
Memory Sources
How to test memory
Quality of Memory - Remarked versus marked, brand name vs no name
What is the SPD and how to program it
Evolution of memory