Cards in a series usually have the same high level architecture but will have differences that make them more or less powerful, for example: more memory, bigger bus, faster clock speeds, etc. will make them more powerful. See the table below, the numbers in all the columns generally get bigger the further down the table you look.
[https://en.wikipedia.org/wiki/GeForce_30_series#GeForce_30_(30xx)_series_for_desktops](https://en.wikipedia.org/wiki/GeForce_30_series#GeForce_30_(30xx)_series_for_desktops)
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