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The secondary display capabilities of each recent -- G3 and later -- Mac are listed below. For complete specs on a particular system, click on the name of the Mac (left column). For all Macs that match a specific secondary display capability or resolution -- courtesy of EveryMac.com's Ultimate Mac Sort -- click the secondary display capability or resolution of interest (right column).
Please note that "mirroring" means a Mac is capable of displaying the contents of the first display on a second display and "dual" means that a Mac can support two displays with different content on each display. Systems that are listed as "Mirroring Only" but with an asterisk are capable of supporting dual displays with third-party hacks.
Please also note that this listing is for systems as shipped -- of course, systems that are capable of supporting additional video cards can support additional displays if another video card is installed. Likewise, third-party graphics cards may support resolutions higher or lower than those provided.
In general, please additionally be mindful of asterisks, as these indicate that particularly important details are provided on the complete specs page.
In addition to specs listed By Capability, EveryMac.com offers Apple Mac specs listed By Year, By Identifier, By Processor, By Case Type, and By 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.