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What is DDR SDRAM?

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What is DDR SDRAM?

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Double data rate synchronous dynamic random access memory, or DDR SDRAM, is computer memory. The previous version is single data rate or SDRAM. DDR SDRAM was built on the technology of the prior version, but operates at almost twice the bandwidth or processing speed. This is possible because the data is transferred using the double pumping technique. In this technique, the data is transferred when the clock increases and decreases. An additional benefit of this process is that no changes or adjustments are required to the clock frequency. DDR memory transfers the data in 64-bit pieces. The actual transfer rate is calculated by multiplying the memory clock rate times two, as it is a dual unit. This value is then multiplied by 64, which is the number of bits that were transferred. The total value is divided by eight, which is a unit conversion for bits per byte. The final value is provided in megabytes per second or MB/s. There are set manufacturing standard data rates for memory, which

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Basically its SDRAM memory that has the ability to perform two operations per cycle, or ‘Double Data Rate’, instead of just one like standard SDRAM memory. Does that mean its twice as fast? Well no, there are many other issues that also affect memory performance. For more detailed info on memory and DDR take a look at these links as well as some of the memory articles linked from the front page http://www.via.com.tw/company/ddrzone.htm http://www.teamddr.com/ http://www.crucial.com/ddr/index.asp As when EDO replaced FP memory, SDRAM replaced EDO and RDRAM tried to replace SDRAM, or even when PC133 supplanted PC100 SDRAM, I didnt expect to see a significant performance improvement with any of them. As expected, what we saw was a small incremental difference. But what we did see was memory technology that was then able to keep up with newer chipset and CPU technology: Higher bandwidth to go with ever faster CPUs and Front Side Buss. As an example did we really see any difference between

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