DDR-2 information

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eyupo (Kanka)

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Perşembe, Nisan 23, 2009 · Kategori: Teknoloji

DDR2 SDRAM is a double data rate synchronous dynamic random access memory technology. It supersedes the original DDR SDRAM specification and the two are not compatible. The primary improvement that DDR2 brings over its predecessor is the operation of the external data bus at twice the clock rate. This is achieved by operating the memory cells at half the clock rate (one quarter of the data transfer rate), rather than at the clock rate as in the original DDR. Consequently, DDR2 memory operating at the same external data bus clock rate as DDR will provide the same bandwidth but with higher latency, resulting in inferior performance. Alternatively, DDR2 memory operating at twice the external data bus clock rate as DDR may provide twice the bandwidth with the same latency (in nanoseconds).

Standard name	Memory clock	Cycle time	I/O Bus clock	Data transfers per second	Module name	Peak transfer rate	Timings^[2]^[3]
DDR2-400	100 MHz	10 ns	200 MHz	400 Million	PC2-3200	3200 MB/s	3-3-3 4-4-4
DDR2-533	133 MHz	7.5 ns	266 MHz	533 Million	PC2-4200 PC2-4300¹	4266 MB/s	3-3-3 4-4-4
DDR2-667	166 MHz	6 ns	333 MHz	667 Million	PC2-5300 PC2-5400¹	5333 MB/s	4-4-4 5-5-5
DDR2-800	200 MHz	5 ns	400 MHz	800 Million	PC2-6400	6400 MB/s	4-4-4 5-5-5 6-6-6
DDR2-1066	266 MHz	3.75 ns	533 MHz	1066 Million	PC2-8500 PC2-8600¹	8533 MB/s	6-6-6 7-7-7

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