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2019 iMac: Crucial RAM upgrade?

Dagobah

macrumors newbie
Original poster
Jun 29, 2010
3
0
I've got a 2019 27" iMac and looking to upgrade the ram. I've read through replies here and seen a few people suggest grabbing this 32GB kit and adding it to the 8GB factory for a total of 40GB. However, Crucial is saying it's not supported. They're showing only these 8GB or 16GB kits work.

What gives?
 

MacManiac76

macrumors 68000
Apr 21, 2007
1,592
380
White Mntns, Arizona
The 32 GB kit will work just fine. I just ordered one for my new 2019 27" iMac and it works flawlessly, added to the existing 8 GB. I looked at the specs and they are exactly what I ordered (DDR4-2666, PC4-21300, CL19). I ordered mine from NewEgg since Crucial was out of stock on their own site. Was also tax-free for me on NewEgg, which was an added bonus.
 
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Dagobah

macrumors newbie
Original poster
Jun 29, 2010
3
0
Just seems strange. If it works without issue, why wouldn't Crucial say so? I'm sure they'd like to sell more ram.
 
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mmomega

macrumors demi-god
Dec 30, 2009
3,782
1,946
DFW, TX
I've got a 2019 27" iMac and looking to upgrade the ram. I've read through replies here and seen a few people suggest grabbing this 32GB kit and adding it to the 8GB factory for a total of 40GB. However, Crucial is saying it's not supported. They're showing only these 8GB or 16GB kits work.

What gives?
I have 2 of those 32GB kits in my 2019 iMac. 1 kit in my wife's Mac Mini more recently.
Absolutely zero issues at all.
Screen Shot 2019-09-11 at 10.57.27 PM.png

Ever since memory controllers started being integrated into the CPU, I have matched RAM speed/amount based off of the CPU and I've only ever had 1 bad experience because 1 stick of RAM was bad.
You can completely choose a different brand if that gives piece of mind, I'm just stating my machine does not get turned off and is used daily and I have yet to have a bad experience with this computer.

Good luck
 
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MacManiac76

macrumors 68000
Apr 21, 2007
1,592
380
White Mntns, Arizona
I have never had any issues using Crucial RAM in any of my Macs. The hardest part right now is finding a store that has them in stock at a decent price, especially for the latest iMacs and Mac mini.
 
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TheIntruder

macrumors 65816
Jul 2, 2008
1,323
843
I'm curious as to why Crucial is being so restrictive with the 2019 iMac spec.

If you compare their support pages for the 2019 iMac vs. the 2018 mini, the latter has many more options, despite the fact that both use the same memory.

The Hynix modules installed in my iMac from the factory have the same part number as those from the mini, according to my System Profiler report.
 
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28Gauge

macrumors 6502a
Sep 4, 2011
685
410
DFW
I bought this exact kit from Amazon for my new 2019 27" iMac about 6 weeks ago and it works like a charm. I did all of the research like you and saw all of the claims that it would work vs. what Crucial said would/would not work and was a bit confused by it all. In the end this kit is just fine. I am now sitting at 40GB of RAM (8GB of factory RAM and 32GB of Crucial) @2667 MHz.
 
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jacklimcss

macrumors newbie
Oct 24, 2019
3
0
So for now is it still safe to buy the Crucial RAM 16gb x 2 on my 2019 iMac 27"?
 
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loekf

macrumors 6502a
Mar 23, 2015
716
401
Nijmegen, The Netherlands
So for now is it still safe to buy the Crucial RAM 16gb x 2 on my 2019 iMac 27"?

Yep.

I would say as long as the pairs are the same size and brand.

So:

Slot A: stock 4 GB
Slot B: 16 GB Crucial
Slot C: stock 4 GB
Slot D: 16 GB Crucial

this ensures the two SODIMMs can operate in banks. I didn't check the stock modules the
last time I openen the iMac's memory bay of my 2019 iMac. Think Apple is using Hynix.
 
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jacklimcss

macrumors newbie
Oct 24, 2019
3
0
Yep.

I would say as long as the pairs are the same size and brand.

So:

Slot A: stock 4 GB
Slot B: 16 GB Crucial
Slot C: stock 4 GB
Slot D: 16 GB Crucial

this ensures the two SODIMMs can operate in banks. I didn't check the stock modules the
last time I openen the iMac's memory bay of my 2019 iMac. Think Apple is using Hynix.
So I must follow exactly the placement of my RAM in order to cause any complication right?If thats it, I'm going to order mine tomorrow :) Thank you!
 
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28Gauge

macrumors 6502a
Sep 4, 2011
685
410
DFW
I have 2 of those 32GB kits in my 2019 iMac. 1 kit in my wife's Mac Mini more recently.
Absolutely zero issues at all.
View attachment 857535
Ever since memory controllers started being integrated into the CPU, I have matched RAM speed/amount based off of the CPU and I've only ever had 1 bad experience because 1 stick of RAM was bad.
You can completely choose a different brand if that gives piece of mind, I'm just stating my machine does not get turned off and is used daily and I have yet to have a bad experience with this computer.

Good luck

Amazon has this RAM as a Cyber Monday deal for $93.99. That is the best price that I have seen on this.
 
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