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What does Dual Channel RAM do?

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What does Dual channel ram do differently than single channel. Is DDR2 dual channel and DDR is single channel. Or am I getting the message. Please explain.
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    motto - Just get-er-done

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Probably one of the best explanations on dual channel is here.


Dual Channel is different than DDR in that dual channel is coding built into the northbridge chipset. DDR is a type of memory( Double Data Rate).


Remember, DDR refers to RAM that transfers data on both the rising and falling edges of each clock cycle, thereby turning 133MHz SDRAM into 266MHz DDR SDRAM. A dual-channel DDR controller implements two separate memory channels, each compatible with DDR memory. One is a memory design(DDR) and the other is a chipset design(Dual Channel).

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