Other World Computing (OWC) today announced lower prices on its Mercury Extreme G4 processor upgrade line. Each Mercury Extreme G4 features 256KB of 1:1 L2 Cache and 2MB of high-speed L3 Cache. All units are covered by OWC’s three-year limited warranty and offer 30-day, 100% money-back guarantee, allowing customers to try without risk. Pricing for the upgrades start at US$159.