1.1ghz IBM 750GX / G3 cpu. http://www.aceshardware.com/ "Typical power dissipation is under 8 W at 1 GHz and the chip is pin-compatible with the 750FX." There's more details here. I'm not sure it actually means anything to anyone, not even the 3% of the world that uses Macs, unless Apple decide they want to use it in upgraded ibook - the only Mac still using a G3. (edit - apparently the FX is the G3 in the iBooks, so it may mean quicker iBooks.)