Sonnet today announced a new Encore/ZIF G4 1.0GHz model, the fastest processor upgrade available for Power Macs with ZIF processor sockets. The upgrade utilizes the Motorola 745X series G4 chips and has 256K of L2 cache with 1MB of L3 cache, which provides up to a ten time speed improvement over the original system.
The new Encore/ZIF G4 1GHz is compatible with Beige G3 Power Macs. Additional speeds and expanded compatibility with Blue & White and G4 PCI Graphics systems are expected in the coming weeks for US$700. Sonnet continues to offer its entry-level of Encore/ZIF G4 models, which are compatible with all Beige G3s, Blue & White G3 Towers, and PCI Graphics G4 Towers. The Encore/ZIF G3/500M is $170 and the Encore/ZIF G4/500 is $300.
More info here.