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This may not even be possible. You mentioned that it's a Gateway. I don't think Gateways conform to any standard (such as ATX). So it may not be possible to find a motherboard to fit your case.
You do not have to worry about the speed of the RAM. Generally speaking, faster is better. If it's too fast, the computer will automatically slow it down to whatever it can handle. If it's too slow, I guess it will just run as fast as it can.
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