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DDR2-667 Is Coming!

You can read about the basics of DDR2 memory here . DDR2 is the successor to conventional double data rate SDRAM, but does not introduce any really new technology. Data is transmitted both at the rising and the falling clock edge, which results in a doubling of bandwidth. DDR2-533 works at a basic clock of 266 MHz. Multiplying by its bus width of 64 bits will give you the bandwidth in Megabits per second. Dividing by 8 will result in MegaBytes per second. The following table includes all common DDR memory types:

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Memory	Clock	Type	BandwidthSingle Ch.	BandwidthDual Ch.
DDR266	133 MHz DDR	PC2100	2,100 MB/s	4,200 MB/s
DDR333	166 MHz DDR	PC2700	2,700 MB/s	5,400 MB/s
DDR400	200 MHz DDR	PC3200	3,200 MB/s	6,400 MB/s
DDR2-400	200 MHz DDR	PC2-3200	3,200 MB/s	6,400 MB/s
DDR2-533	266 MHz DDR	PC2-4300	4,266 MB/s	8,533 MB/s
DDR2-667	333 MHz DDR	PC2-5300	5,333 MB/s	10,666 MB/s
DDR2-800	400 MHz DDR	PC2-6400	6,400 MB/s	12,800 MB/s

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Patrick Schmid was the editor-in-chief for Tom's Hardware from 2005 to 2006. He wrote numerous articles on a wide range of hardware topics, including storage, CPUs, and system builds.