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It has two DDR-DIMM sockets, accepting up to 2 GB of DDR266/333/400 memory. Please pay very close attention here. ECS should have used different colors on the memory sockets to let you know that this motherboard supports DDR dual channel feature. You need to install two identical memory modules in order to achieve the maximum performance this motherboard can provide.

Of course people that buy a socket 939 motherboard knows that the CPU memory controller is capable of running under dual channel mode, but using the same color on both sockets may lead users to think that this motherboard uses single channel mode. Several users may install only one memory module on this motherboard because of this, reducing the PC performance.

So with this motherboard you need to always use two identical memory modules in order to use dual channel feature, which increases the system performance.

לקוח מהכתבה:
http://www.hardwaresecrets.com/article/358