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A1418 / EMC 3068 / iMac 18,1 / 2.3 GHz dual-core i5 processor. Released June 2017.

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2400 MHz RAM in a 2133 iMac?

I am looking to upgrade the iMac to 32 GB of RAM, but most of the kits I see seem to be 2400 MHz, intended for the retina model 21.5” from this year.

It should be fine to use the faster speed in this model, correct?

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Please tell us the exact machine you are referencing. OR You can look it up yourself here:


RAM Type:PC4-17000 DDR4*Min. RAM Speed:2133 MHz

Details:*Apple reports that this model ships standard with 8 GB of "2133 MHz DDR4 onboard memory." Thankfully, however, this is not entirely accurate.

Standard RAM:8 GBMaximum RAM:16 GB*

Details:*8 GB of RAM is standard and reported as onboard with an optional upgrade to 16 GB of RAM at the time of purchase for an extra US$200.

In a pleasant surprise, as first discovered by site sponsor OWC, this memory actually is not onboard and can be replaced or upgraded after the initial purchase of the Mac, it's just unnecessarily complicated.

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Apple iMac 21.5-Inch "Core i5" 2.3 (Mid-2017) Specs

Identifiers: Mid-2017 - MMQA2LL/A* - iMac18,1 - A1418 - 3068


Hello Jon, did you upgrade your iMac with 2400 modules? Im looking for 2133 and I dont find anything on the market.


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I have your model and everything I’ve read even the box says 2133 but I opened it up and the sticks themselves are 2400T

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Jon sera éternellement reconnaissant.
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