The command string:
     lscfg -vl "mem*" | grep -E "mem|Size"
    Will show all the memory in the system and the amount of
    memory (in Mb) in each bank.

       An example of the output might be:

         mem0              00-0A             Memory Card
               Size........................0064
               Size........................0064
               Size........................0000
               Size........................0000
         mem1              00-0B             Memory Card
               Size........................0256
               Size........................0256
               Size........................0256
               Size........................0256
         mem2              00-0C             Memory Card
               Size........................0128
               Size........................0128
               Size........................0000
               Size........................0000