VMAX cache board size question

Hello,

When I check the cache board size for our newly installed VMA using command "symcfg -sid xxxx list -memory", I see the following output:

Symmetrix ID : 00029260XXXX

Number of Memory Boards : 6

Slot Number Capacity(MB)

     4      28672

     5      28672

     6      28672

     7      28672

     8      28672

     9      28672

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Total (Usable Cache) 86016

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My question is why each board showing up as "28 GB" board?? As per documentation, the boards are either 16 or 32 or 64 GB each.

Could somebody explain this?

Thanks.