AS-SQL-2000

Hi All, i've got a question related to cube size.

When I create DIMENSION, I can choose separate column for the KEY and MEMBER
NAME. Usually that KEY is usually an integer and is stored on fewer bytes
compared with dimension MEMBER NAME.
In my case, I can use MEMBER NAME for KEY as well. Actually I did. But now I
have KEY column also available. So ...

The question is does above impact data storage in the cube and most
importantly cube size. To be more precise: Is the cube goign to be smaller if
I use small integer for a KEY?

Many thanks,