dual channel memory...dont understand

You need sets of equal size. For example you could use 2x1 GB and 2X 512 MB in dual channel. You can't, however, use 3 sticks - 2x 1 GB and 1x 512 MB would not work in dual channel. The memory speed also drops to the lowest of the sticks.
 
yes, or you could buy 2 non 'dual channel kit' sticks of ram that are the same size and it will work in dual channel
 
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