Depends on what do you mean by "PPC"?
OS3 + PPC: just select large enough RAM size. (=requires at least 2 Z3 boards because max Z3 size is 1G. Select the another from RAM panel advanced region)
OS4: impossible. OS4 only accepts official Z3 space = all Z3 boards must fit in 1G space.
Check Hardware Info panel for Z2/Z3 allocation details.
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