Other World Computing (OWC) today announced the introduction of a new Mercury Extreme G4/1.3-1.33GHz processor upgrade for US$259. OWC also has lowered prices on its 1.2GHz model to $229. All Mercury Extreme G4 processor upgrades are designed for plug-and-play installation and include 256K of 1:1 L2 cache on-chip and 2MB of high-speed L3 Cache. The company also backs all of its Mercury Extreme processor upgrades with a three-year warranty.