Introduction to DDR-2: The DDR Memory Replacement

"DDR2-SDRAM is considered an evolutionary upgrade over existing DDR memory. It maintains the same core functions, transferring 64 bits of data twice every clock cycle for an effective transfer rate twice that of the front-side bus (FSB) of a computer system, and an effective bandwidth equal to its speed x 8."
DDR2 also raises the speed and throughput levels at the expense of higher latency timings. Somehow I don't think that will matter much once things get moving.

A good read, check it out.

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