Stands for “Double Data Rate2”, DDR2 may be the second-generation of DDR memory that started being offered in 2003 that’s been replaced by DDR3. DDR2 provides a better bandwidth potential, is able to running at greater rates of 400 MHz and greater, works in lower-power consumption, and produces less heat.

Due to the differences between DDR2 and DDR, DDR2 memory segments are not compatible with DDR slots.

Since the DDR2 internal clock runs at half the DDR external clock rate, DDR2 memory operating at the same external data bus clock rate as DDR results in DDR2 being able to provide the same bandwidth but with higher latency.

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Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone.