DDR Memory

Double Data Rate SDRAM (DIMMs)

PC4000 for 500 MHz FSB

     PC3500 for 433 MHz FSB

     PC3200 for 400 MHz FSB

     PC2700 for 333 MHz FSB

PC2100 for 266 MHz FSB

PC1600 for 200 MHz FSB

DDR SDRAM is essentially an evolutionary step over existing SDRAM. DDR, or Double Data Rate, is very similar to SDRAM in design and operation, the only difference being that it transfers on the rising and falling edges of a clock cycle. Contrasted with regular SDRAM, which can only transfer on the rising edge, that gives DDR SDRAM, effectively twice the bandwidth/speed.

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