Other World Computing (OWC) today expanded its Mercury Extreme product line with the introduction of new G4/1.4-1.467GHz and G4/1.25-1.26GHz processor upgrades, available immediately for US$619.99 and $499.99, respectively. The upgrade cards feature 256 Kilobytes of 1:1 L2 cache on-chip and 2 Megabytes of high-speed synchronous dynamic RAM (DDR L3) operating at up to 267 Megahertz (MHz). They are compatible with Sawtooth, Gigabit Ethernet, Digital Audio, Quicksilver and Quicksilver 2002 Power Mac models and support Mac OS 9.2.1 and higher, as well as OS X.