Let me save you people some trouble. 1). This card does work on pc's. 2) Apple Computer has pulled it from the Apple Store 3) It does NOT work on G4 towers with theexception of the "MIRROR-DOOR Models ONLY! " 4) ATI tech support acknowledged to me that they where only able to get the card to run on a MIRROR-DOOR MODEL G4 and nothing else, yet it continues to be marketed for "AGP G4 Towers". There are no AGP cards currently manufactured for the G4 Tower. THe only card which works at this time is the Radeon 9200 (PCI). If you need an AGP card you MUST go to éBy for it. Please Believe me on this...I learned the hard way and want to save you the hassles that I went through. :-)