RAM for the new iMac 27'' introduced at WWDC 2017

Hello.

I was wondering whether any RAM that has these specs will fit the new 27'' 5K iMac?

  • DDR4-2400MHz
  • SO-DIMM
  • 260pin

Or is there anything else I need to pay attention to (like, whether it's single- or double-ranked, etc)?

In particular, I'd like to know if this RAM upgrade kit works for the new iMac:

https://www.amazon.de/gp/product/B019FRC...

Thank you and kind regards,

- Matt

Answered! View the answer I have this problem too

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I bet you its all soldered on so you can't upgrade it.

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actually, it's explicitly allowed; says "user accessible" on the tech specs page for the 27'' model: https://www.apple.com/imac/specs/

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You'll need to wait a bit more until the dust settles. OWC or any other supplier will need to take a peak on what Apple used in a real system (buying a system) to then get the specs directly off the modules so they can then locate similar modules.

I would wait a week or so.

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The thing is, OWC and Crucial already sell 2017 iMac memory.

But the one I'm linking to is a little cheaper, that's why I'm asking if it's compatible.

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Well, I've heard from Crucial now that they fit the specs, but they won't give a 100% guarantee that they work, because they're double-ranked, and Crucial's Mac-dedicated RAM is single-ranked.

But seeing as OWC sells double-ranked RAM for these new iMacs, I think I'm on the safe side to buy these.

UPDATE: After having bought and installed the RAM linked above - it works beautifully in the new iMac 5k 27'' (2017) machines.

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Did you use Crucial or OWC?

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I used Crucial, the RAM module I linked in the original question. Works like a charm!

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OWC has confirmed with their testing ram is a easy upgrade to 64Gb on all 27inch models, to a max of 16gb per ram module

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Yes, that's why I'm asking if those specs, and in particular that model of RAM, is compatible with the new iMac.

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So, Matthias, at the end did you buy and test the Crucial RAM?

I want to make the same upgrade and I was wondering if to go for the same Crucial CT16G4SFD824A (just different capacity than yours).

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Marco, I bought that RAM, yes. I'm receiving my iMac today and the RAM tomorrow, so I'll know then if it's really compatible or not - but I don't have any doubts it does. I'll keep you posted.

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Thanks a lot, Matthias. I will receive my iMac on Monday and wait for your feedback in these days to order the Crucial CT16G4SFD824A.

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Marco, the RAM I linked to above works beautifully. Running on 40 GB now :)

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Matthias Gansrigler will be eternally grateful.
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