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The Power Mac G4'' (originally Power Macintosh G4) is a series of personal computers that was designed, manufactured, and sold by Apple between 1999 and 2004. They used the PowerPC G4 (PPC74xx) series of microprocessors. They were heralded by Apple to be the first personal supercomputers, reaching speeds of 4 to 20 Gigaflops. They were the last Macintosh computers able to boot natively to Classic Mac OS. ==Original models== The original Apple Power Mac G4, code name "Yikes!", was introduced at the Seybold conference in San Francisco on August 31, 1999, with , and configurations available. In October 1999, Apple was forced to postpone the because of poor yield of the chips. In response, Apple “speed dumped” the clock speed of the processor in each configuration by which caused some controversy because they did not decrease the price of the machines. The early (later ) PCI-based version used a motherboard identical to the one used in Power Macintosh G3 (Blue & White) computers including the use of Zero Insertion Force (ZIF) processors sockets〔(【引用サイトリンク】title=The Apple Power Macintosh G4 400MHz PCI )〕 (minus the ADB port), in a "graphite" colored case and with the new Motorola PowerPC 7400 (G4) CPU. The higher-speed models, code name "Sawtooth", used a greatly modified motherboard design with AGP 2x graphics (replacing the PCI slot). In December 1999, the entire Power Mac G4 line was updated to the AGP motherboard. The machines featured DVD-ROM drives as standard. The and versions had Zip drives as standard equipment, and as an option on the Sawtooth. This series had a system bus and four PC100 SDRAM slots for up to of RAM ( under Mac OS 9). The AGP Power Macs were the first to include an AirPort slot and DVI video port. The version was reintroduced on February 16, 2000, accompanied by and models. DVD-RAM and Zip drives featured on these later and versions and were an option on the 400 MHz. Apple's marketing name for all these early AGP models is Power Mac AGP Graphics. The code name Sawtooth was used internally before release and is a popular designation among enthusiasts. The design was updated at the Macworld Expo New York on July 19, 2000; the new revision included dual-processor and versions, and a low-end single CPU model. It was also the first personal computer to include gigabit Ethernet as standard. Most people saw this revision as a stopgap release, because higher clocked G4s were not available; the G4’s Motorola XPC107 “Grackle” PCI/Memory controller prevented the G4 from hitting speeds higher than . The dual models featured DVD-RAM optical drive. Zip drives were optional on all models. These models also introduced Apple's proprietary Apple Display Connector video port. Apple's marketing name for this series is the Power Mac Gigabit Ethernet. The code name was Mystic. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Power Mac G4」の詳細全文を読む スポンサード リンク
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