If Identical RAM's are used in the DIMM slots then they will be operating in Dual channel mode, Else if they are not identical they will be working in single channel Mode. From certain websites it is beleived that Dual channel operation is better than a single channel. I beleive still if they are not identical also ( lets say 2 GB + 1 GB) you can restrict the 2 GB to act as 1 GB so it will be operating in dual channel mode from BIOS but will not be able to use the full capacity of 3 GB. Just a Thought.
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I think with the memory controller on the chip, it makes the ram access fast, so any negative effects are minimised.