Hmm....I guess in a perfect world two sticks of 1GB would have been better for the dual channel purposes....but.... I think if you put the 2GB in slot A and the 512 in slot B you should be fine. The boost you'll recieve from the extra gig of RAM will negate any loss from it not really being 'dual channel' (as I'm sure your aware they are supposed to be the same size sticks for dual channel).

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