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The actual maximum RAM of all G3 and later Macs are organized below by category.
Some Macs only can use the "official" maximum RAM as specified by Apple, others actually can use more RAM, and still others have soldered RAM and cannot be upgraded at all after initial system purchase. This section makes differentation easy.
In general, as long as you purchase RAM from a vendor that has tested its RAM with your particular type of Mac, the actual maximum amount of RAM should operate stably but be sure to also read the complete specs page for a specific Mac as some actual maximum RAM numbers are dependent on OS version, firmware, or other details.
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Please note that the thumbnail images merely show one of the more representative Macs in a category. Many series also include other models with different designs.