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The actual maximum RAM of each recent -- G3 and later -- Mac is listed below. For complete specs on a particular system, click on the name of the Mac (left column).
Please note asterisks, as these indicate that particularly important details (such as a different "official" maximum RAM capacity) are provided on the complete specs page.
If you are not sure which Mac you have, look it up by Order Number, Model Number, EMC Number, Model Identifier, or Serial Number with EveryMac.com's Ultimate Mac Lookup feature or the EveryMac app. If you need help, refer to Mac Identification.