RE: I'm not sure if there's any speed bump (it may be like thinking you're getting better mileage after you wash you car)... This is most probably due to the quote from the Product Description above: "Version 1.4.6 replaces "Sonnet G4 Enabler 9" with "Sonnet Processor Enabler," which is compatible with System 7 through Mac OS 9.1. It is required for G4 AltiVecâ122 support on pre-Blue & White Power Macintosh computers, and improves AltiVec compatibility with some programs, such as Virtual PCâ122 4.x"