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I am not a hardware guy. I just heard this from a service engineer

Memory cards of unequal capacities should not be used. that is if there is a 1 GB already in the slot, we need to add another 1 GB card only. Not 512 MB or 2 GB.

Is there a problem if we use memory cards which are not equal capacities?

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up vote 1 down vote accepted

In case of a dual channel architecture, matching memory modules are recommended for best performance and compatibility.

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You can mix and match different sizes; I have commonly used 1 GB and .5 GB together to get 1.5 GB total. But you don't get dual channel performance. So I probably wouldn't add a 256 or 512 MB to a 2 GB, but I would to a 1.

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