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The maximum version of Mac OS X supported by each G3 and later Mac is below. For complete specs on a particular system, click on the name of the Mac (left column). For all Macs that are compatible with a specifc maximum supported version of Mac OS X -- courtesy of EveryMac.com's Ultimate Mac Sort -- click the OS of interest (right column).
Systems with "Current" support the latest version of OS X 10.8 "Mountain Lion." Note that systems marked "Current*" (Current and an asterisk) also are capable of running OS X 10.8 "Mountain Lion" but with limitations. Systems with other OS versions listed and an asterisk are capable of running the version of the operating system (but no higher) and with limitations. See the specs page for a particular model for details.
In addition to specs listed By Capability, EveryMac.com offers Apple Mac specs listed By Year, Identifier, Processor, Case Type, and Global Original Prices. Currently Shipping Macs also may be of interest.
If you are not sure which Mac you have, look it up by Order Number, Model Number, EMC Number, Model Identifier or Serial Number "Snippet," with EveryMac.com's Ultimate Mac Lookup feature. If you need help, refer to Mac Identification.