Dual channel ddr2 ram?

is a single 1gb ddr2 module better than two ddr2 512mb(dual channel) ??
is there any difference in performance?

what does dual channel mean?

i looked at some rams.. and found most of them with 667mhz where pc5400, and some of them the same speed but pc5300.. whats the difference, and how does this have an effect on performance?

and what does pc25400 mean?
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