The so-called dual channel is to add a single memory bus, let communication bridge between the chip and memory module bandwidth to twice times, although this new specification is mainly chipset and host board end of the change, but the purpose of dual channel is also to solve the problem of memory bandwidth, so that the host board even if only using DDR400 memory, Also can reach the frequency width 6.4gb/s.
In the past, memory modules in the bandwidth and data transmission speed progress, always with the central processing Unit to maintain a certain degree of gap, and as the CPU operation faster and faster, in the ideal situation must also promote the front-end bus (Front Side buses) and the memory bus (Memory) speed, In order to enable the computer system to display the original expected performance, however, the single channel memory speed and the bus transmission bandwidth, still can not cope with the CPU and front-end bus requirements.
As Intel promotes the front-end bus FSB to 800MHz, the bandwidth between the central processor and the North Bridge chip is increased to 6.4gb/s, which is not sufficient to handle DDR266 or DDR333 memory modules, and must be paired with both channels (Dual Channel) DDR400 memory specifications to achieve 6.4gb/s, in order to meet the needs of FSB800 bandwidth.
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