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As said above, Dell will probably not allow you to do too much with their board. They do this for a reason. So, I would tell you to stick with the DDR400.
As for the memory in dual channel, 512mb sticks take longer to access than than sticks of a smaller size. If you have 4x256mb then your access times should be quicker, and your performance should be slightly higher. Do not that you really would not notice any of this difference as it happens in fractions of milliseconds. But, if you ran a benchmark program, the 256 should come out on top. Also, make sure you buy only quality ram. Mushkin, Kingston, and Corsair and make really good ram.
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"You hear the one about the fella who died, went to the pearly gates? St. Peter let him in. Sees a guy in a suit making a closing argument. Says, "Who's that?" St. Peter says, "Oh, that's God. Thinks he's Denny Crane."
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