ThermographX is compatible with many recent Macintosh models. It is known to provide accurate sensor readings on these models: 12" & 17" PowerBook G4. "Aluminum" 15" PowerBook G4. "Mirror Door" G4 (see note #2 below). Power Macintosh G5. iBook G4. G4 Cube (see note #2 below). iMac G4 & G5. Note #1 : Motorola's MPC7450CE/D Rev 5 errata indicates "The thermal assist unit (TAU) is no longer supported on the MPC7450, MPC7451, or MPC7441.". Because of this, you will not be able to measure the junction temperature on any system with these processors. At current, this includes the "Gigabit" PowerBook G4 and the "2001 Quicksilver" G4's. Note #2 : Mac OS X 10.3.5 eliminates compatibility with some older Mac's, like the G4 Cube. I'm investigating if there is a workaround. -- DBM DBM.tree at gmail.com