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SDRAM
Synchronous DRAM uses a clock to synchronize signal input and output on
a memory chip. The clock is coordinated with the CPU clock so the timing
of the memory chips and the timing of the CPU are in synch.
Synchronous DRAM saves time in executing commands and transmitting data,
thereby increasing the overall performance of the computer. In pure
speed tests, SDRAM is about 50 percent faster than EDO memory, with
actual performance gains of around 25 percent.
SDRAM II (DDR)
Double-data rate SDRAM is a faster version of SDRAM that is able to read
data on both the rising and the falling edge of the system clock, thus
doubling the data rate of the memory chip. In music, this would be
similar to playing a note on both the upbeat and the downbeat.
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