Sonnet brings the G3 revolution to previously "upgrade-challenged" Power Macintosh and Performa computers that were built with no processor upgrade slot. Through innovative engineering, Sonnet has designed the Crescendo/L2 G3 to be a "plug-and-play" processor upgrade card that installs into the L2 backside cache slot of the computer. The Crescendo/L2 G3 incorporates the revolutionary PowerPC G3 processor and ultra, high-speed Level 2 backside cache.