Yikes, Sawtooth, & Shark Power Macintosh G4s | AppleInsider

On Tuesday, Apple officially announced its Power Macintosh G4 product line. The new Pro Models will be available in 400, 450 and 500MHz configurations. The 400MHz configuration, which was code-named \"Yikes!,\" is based on the current Yosemite (Power Macintosh G3) logic board, while the 450 and 500MHz versions are based on the major architectural design, which was code-named Sawtooth. Reliable reports received by AppleInsider suggest that these configurations were a result of some last-minute changes.