Did you try putting them in both of the black DIMM slots instead? I'm running two different types of RAM in my machine, and it runs in dual-channel (P4C800E board, though)
Your RAM has different chips than the first, which is why you have all on one side, and the other is on both sides. The chips are just more memory per chip, which is why they are all crammed on one side of the stick. This is the same style that's used on the 1GB stick, however, I don't think that should make a difference, because mine are the same way, one having chips on both sides, and the other only on one side.
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