Search notes:

CIM Class Win32_PhysicalMemory

The class hierarchy of win32_physicalMemory is: 
cim-classHierarchy (get-cimClass win32_physicalMemory)
ROOT/Cimv2 CIM_ManagedSystemElement
ROOT/Cimv2 CIM_PhysicalElement
ROOT/Cimv2 CIM_PhysicalComponent
ROOT/Cimv2 CIM_Chip
ROOT/Cimv2 CIM_PhysicalMemory
ROOT/Cimv2 Win32_PhysicalMemory

See also

Determining the amount of physical memory (on the command line).

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