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PSU = power source unit/power supply unit (depending on who you ask). The only problem, like Lasereth said, is that it might not fit. Dell, for example, a lot of times has motherboards and PSUs that won't fit in other cases, in order to make people buy THEIR stuff when they need to upgrade. Lousy bastids.
Given that it's a Compaq Presario, chances are that the memory is not dual channel. I would still check the documentation to see if you can find anything about it, but it should be pretty obvious if it is. I would get the memory and pull out one of the 256s.
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