A1418 / EMC 2833 / Late 2015 / 3.1 GHz Core i5 or 3.3GHz Core i7 Processor. Released October 13, 2015.

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Additional memory module installation

My iMac came with 8GB (2 x 4GB memory modules) installed. I would like to increase the Mac's memory, by installing two more modules into the unused sockets. Can I just add an additional 2 x 8GB modules to raise it up to 24GB, or will there be an imbalance with a mixture of 4 GB and 8 GB modules installed. I vaguely remember similar problems being caused on early Windows PCs.

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Please give us your exact model.

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On the 4K machines I have seen,

these:

iMac "Core i5" 3.1 21.5-Inch (4K, Late 2015)3.1 GHz Core i5 (I5-5675R)

iMac "Core i7" 3.3 21.5-Inch (4K, Late 2015)3.3 GHz Core i7 (I7-5775R)

The RAM is soldered onboard and cannot be upgraded at all after the purchase of the system.

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I have a late 2015 27" Retina 4K machine.

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The RAM is soldered onboard and cannot be upgraded at all after the purchase of the system.

Standard RAM: 8 GB Maximum RAM: 16 GB*

Details: *8 GB of RAM is onboard. It can be upgraded to 16 GB at the time of purchase as an optional upgrade for US$200.

http://www.everymac.com/systems/apple/im...

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