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I don't know the technical details behind it, but some sites will list 200MHz because that is the speed that the RAM works at, but because it is DDR (double data rate) that somehow becomes 400MHz - nothing to worry about.
As for the specs - I don't have a clue. They are normally written on a sticker on the modules themselves... assuming you have already bought them. If you put the sticks in and set the BIOS to auto, you can use CPU-Z to read the information about which timings they will work at.
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