what is dual channel DDR?

What is Dual Channel DDR?
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  1. from usenet:


    Dual channel RAM means that the motherboard uses two
    memory controllers to tap into the entire bandwidth of two
    sticks of RAM simultaneously. For example, your DDR266
    RAM has a transfer rate of 2.1GB/sec (hence PC2100) but
    your motherboard has dual channel memory controllers.
    Your transfer rate is then 4.2GB/sec.

    P4 RDRAM boards are dual channel. Dual channel DDR
    on an nVidia chipset is the highest performance memory
    system you can buy for the Athlon.

    As to the actual RAM sticks, there is no difference. It is
    just that you always need two to enable dual channel.

    <i>It's always the one thing you never suspected.</i>
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