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By "Card", do you mean a stick(s) of RAM that go inside the computer?
Price - From what I can tell, 2x512 appears to be cheaper
Performance - None as far as I know, BUT dual channel needs two sticks and RAMbus needs to be paired. Also, heat spreading may be an issue as well.
Replacement - Never even thought of this, but if one of the sticks crapped itself, it'd be a lot easier to replace than the one gig stick.
Now, if you mean like a CF or SD card for a PDA or camera or whatever, i suppose a 1GB card would be nicer and probably a bit cheaper.
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