G3 without USB is maxed at 10.2.8, except for the Powerbook G3 250 original Powerbook G3 (also known as Kanga), which could onlybe updated to Mac OS 9.1 (not to be confused with Mac OS X 10.9.1, which is 13 years newer).G3 without Firewire, but with USB are maxed at 10.3.9, except the Powerbook G3 Lombard (Bronze Keyboard) which may have CPU specific issues that limitits upgradeability at all.G3 or G4 of 800 Mhz or less with Firewire are maxed at 10.4.11.PowerPC Macs G4 867 Mhz (on single processor) and above (1 Ghz or higher included), and G5s can upgrade only to Mac OS X 10.5.8, and only support for syncing with iOS 5.x devices and earlier.Intel CoreSolo and Intel CoreDuo can upgrade only to Mac OS X 10.6.8 if they have at least 1 GB of RAM (768 MB is less).
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