Shared Memory Question

I have a question as to how shared memory is used and attributed to Progress Databases.

On a Sun OS UNIX box with shared memory segment size set to 64Mb.

If I start my database with 8000 buffers, I use 66Mb (2 segments).

If I start my database with 7500 buffers, I use 62Mb (1 segment).

Have I reduced my shared memory requirements by 4Mb (66 - 62), or have I reduced my requirements by 64Mb (1 segment)?
 
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