The Sonnet Encore/ST G4 processor upgrade card can accelerate the performance of your Power Mac G4 with significant speed gains over your original processor! With an Encore/ST G4 installed, your system will fully exploit today's industry-leading applications, and will easily handle OS X's increased processing demands. Designed with the maximum cache supported by the processor, the Encore/ST G4 delivers the ultimate in processing power to your compatible computer for a small fraction of the price of a system.