The Giga Designs G-Celerator G4/1.8 Dual AGP 7A features dual 1.8 GHz PowerPC 7447a (G4) processors (1.42 GHz overclocked to 1.8 GHz) each with an AltiVec "Velocity Engine" vector processing unit, and a 512k on-chip level 2 cache operating at the same speed as the processors. The card plugs into the processor socket provided by AGP-based (Sawtooth), Gigabit Ethernet, Digital Audio, Quicksilver, and Quicksilver 2002 Power Macintosh G4 models, replacing the original processor card. Please note that not all AGP-based (Sawtooth) systems are dual-processor compatible (they must have a uni-N of 7 or greater to be able use this card). All upgrade cards in this series are designed so that both the bus and backside cache ratios can be adjusted. Requires MacOS X 10.3.5 for installation, compatible with MacOS 9.2.2 but Giga Designs does not provide a warranty "third party software operations under OS 9". Another version, the 7AD-1416C, for the Power Macintosh G4 Cube is also available. It runs at 1.6 GHz and includes a Cube VRM upgrade and a low speed fan kit.