I've found my old Sawtooth worthy another upgrade. Some time ago I put in a new GPU, Geforce 4 mx (32 mb), which boosted the performance both in Os X and games greatly. I can even play World Of Warcraft (averaging at 12 FPS in most areas). Anyway now I'm looking for a CPU upgrade. I've found OWC Mercury Extreme G4/933MHz-1GHz and Sonnet Encore G4/1GHz to be the best alternatives, having a finger at the last. Does anyone have any experience with any of these cards or any idea which of them being the best pick?