win32_computerSystem is: cim-classHierarchy (get-cimClass win32_computerSystem) ROOT/Cimv2 CIM_ManagedSystemElement ROOT/cimv2 CIM_LogicalElement ROOT/Cimv2 CIM_System ROOT/Cimv2 CIM_ComputerSystem ROOT/Cimv2 CIM_UnitaryComputerSystem ROOT/Cimv2 Win32_ComputerSystem
(get-cimInstance Win32_ComputerSystem).totalPhysicalMemory / 1gb
(get-cimInstance Win32_ComputerSystem).hypervisorPresent
True, it does not necessarily mean that the command was executed within a virtualized machine.