Dual-channel architecture
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Dual-channel architecture DDR/DDR2 SDRAM describes a motherboard technology that effectively doubles data throughput from RAM to the memory controller. Dual channel-enabled memory controllers utilize two 64-bit data channels, resulting in a total bandwidth of 128-bits, to move data from RAM to the CPU.
 
In order to achieve this, the DDR/DDR2 SDRAM memory modules must be installed into matching banks, which are usually color coded on the motherboard. It is not required that identical modules are used, but it is often recommended. One module of 512MB RAM could be installed in bank one and a 1GB module could be installed in bank two. Modules rated at different speeds can be run in dual channel, although the motherboard will then run all memory modules at the speed of the slowest module. Some motherboards however have compatibility issues with certain brands or models of modules when attempting to use them in dual channel mode. For this reason it is generally advised to use identical pairs of memory modules and most memory manufacturers now sell "kits" of matched pair DIMMs. Several motherboard manufacturers only support configurations where a "matched pair" of modules are used.