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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 256K on-chip L2 cache running at full processor speed, and 2MB Double Data Rate L3 cache, the Encore/ST G4 delivers the ultimate in processing power to your compatible computer for a small fraction of the price of a new system.