DDR Memory

Double-data-rate synchronous dynamic random access memory or DDR SDRAM it is one of the new versions which has more peed than the SDRAM because this memory chips allow the data transfer twice for each clock cycle instead of only one time.
For an example, when the programs or data transfers at 64 bits per second (bps), the DDR memory will allows this to be multiplied by 2. Therefore 64 bps x 2 (transfer capacity/clock cycle)/8(bit or bytes) = 16 bytes/second. At the frequency of 13 MHz, the DDR SDRAM gives greatest rate of data transfer of about 2100 MB per second. In addition the more efficient data transfer which DDR provides, it might consume considerably less power. An operating voltage of SDRAM is 3.3 volts, whereas the DDR SDRAM uses just 2.5 volts.
Chips and Module Specifications
DDR SDRAM has specifications for memory modules and memory chips are follows:
(Standard-Module-Memory clock-I/O bus clock-Transfer rate)
(Maximum)
DDR 200 PC1600 100 MegaHertz 100 MegaHertz 1600 MB per second
DDR 266 PC2100 133 MegaHertz 133 MegaHertz 2100 MB per second
DDR 333 PC2700 166 MegaHertz 166 MegaHertz 2700 MB per second
DDR400 PC3200 200 MegaHertz 200 MegaHertz 3200 MB per second
The above mentioned figures are the definite data rates of performance.  A memory chip might perform at clock rates lower or higher than those specified in the practice of underclocking or overclocking.
SDRAM DIMMs have two notches and 240 pins, whereas the DDR SDRAM DIMMs have one notch and 184 pins.

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