Newer Technology has introduced new single- and dual-G4 CPU upgrades for Power Mac G4 Sawtooth, Gigabit, Ethernet, Digital Audio, and Quicksilver Models. The new line of processor upgrades features the Freescale/Motorola G4 7447 architecture and offer a variety of speeds, including a single-2.0GHz, dual-1.6GHz, dual-1.7GHz, and the new high-end dual-1.8GHz. Engineered with "Plug and Play" technology, NewerTech claims to effectively double or even triple the speed of an older Power Macintosh by adding a MAXPower G4 Upgrade. MAXPower Upgrades make use of higher speed Mototrola/FreeScale PowerPC G4 processors that feature uniquely improved technology and added cache capacity over standard original G4 CPUs. The upgrades are compatible with Mac OS 9.2.2 or Mac OS X 10.3.5 and later, including all versions of Mac OS X 10.4 “Tiger” (and Mac OS X 10.5 “Leopard” upon its release). The upgrades cost $400 (single-2.0GHz), $450 (dual-1.6GHz), $530 (dual-1.7GHz), and $600 (dual-1.8GHz).