"Sawtooth" was the not-so-secret code name for the logic board designed specifically for Apple Computer's G4 PowerMac computers. Sometimes written "SawTooth".
Unlike the "Yikes" boards, which came in the slowest MHz G4 PowerMacs that were shipped at the time, the "Sawtooth" boards were optimized for the G4 processor and the newer hardware available, including an AGP graphics slot, a faster Ultra ATA hard drive, up to 50% more RAM, double the memory bandwidth, an internal FireWire port, 2 USB ports instead of one, and a slot for an internal AirPort card.