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DDR2 DIMMs are neither forward compatible with DDR3 nor backward compatible with DDR.In addition to double pumping the data bus as in DDR SDRAM (transferring data on the rising and falling edges of the bus clock signal), DDR2 allows higher bus speed and requires lower power by running the internal clock at half the speed of the data bus.
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It superseded the original DDR SDRAM specification, and is superseded by DDR3 SDRAM (launched in 2007). From Wikipedia, the free encyclopedia Jump to navigation Jump to search DDR2 SDRAMDouble Data Rate 2 Synchronous Dynamic Random-Access MemoryType of RAMFront and back of a 2GB PC2-5300 DDR2 RAM module for desktop PCs (DIMM)DeveloperJEDECTypeSynchronous dynamic random-access memoryGeneration2nd generationRelease date2003 (2003)StandardsDDR2-400 (PC2-3200)DDR2-533 (PC2-4266)DDR2-666 (PC2-5333)DDR2-800 (PC2-6400)DDR2-1066 (PC2-8533)Clock rate100–266.⅔ MHzCycle time10–3.75 nsBus clock rate200–533.⅓ MHzTransfer rate400–1066.⅔ MT/sVoltage1.8 V PC2-5300 DDR2 SO-DIMM (for notebooks)Double Data Rate 2 Synchronous Dynamic Random-Access Memory, officially abbreviated as DDR2 SDRAM, is a double data rate synchronous dynamic random-access memory interface.
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