RAM modules are not dual channel, its the way you install them on your mobo that makes it dual channel. Basically, there are 2 channels on your mobo (provided your mobo supports dual channel) throught which data is transfered to and fro the processor and the RAM. If you place 2 RAM sticks on 2 different channels you are increasing data transfer thoroughput by double. One analogy to this is 1 lane road and 2 lane road. 1 lane road is similar to single channel mode where only one line of cars can move at one time. In a 2 lane road, 2 lines of cars can move at the same time therby increasing traffic throughput. On a 2 lane road you will reach your office faster, similarly your PC will speed up when on a dual channel mode.