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Why does Nvidia video cards have odd memory numbers?

The base model card usually has a more traditional number, and they cut down the memory bus and corresponding RAM along with shaders when they make the cheaper models. They were using GDDR3 with a wider bus for the current gen, it may have been a cheaper solution than GDDR5 when the GTX series was released.
 
Yea GDDR3 was (and still prolly is) much cheaper than GDDR5, GDDR5 has double the theoretical bandwidth of GDDR3 but NVidia decided it was a cheaper solution to double the bus width instead of using more expensive ram, yeilding the same bandwidth at the cost of having a very large die
 
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