Apple System Profiler will correctly identify a Power Mac G4 (PCI Graphics) computer running Mac OS 8.6 only. Look in the Hardware overview section next to the product name to determine the Power Mac G4 model. However, the current version of Apple System Profiler will not correctly identify the display card in the Power Mac G4 (AGP Graphics) running Mac OS 9 or Mac OS 8.6, and the Power Mac G4 (PCI Graphics) computers running Mac OS 9.
To determine if you have a PCI Graphics or an AGP Graphics version of the Power Mac G4 computer, refer to article 58418: "Power Mac G4: How to Differentiate Between Models".