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winterquilt

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Feb 18, 2008
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What was the last iMac released, with a 27" screen, that could run macOS Mojave please ?

nb. non M1
 

usagora

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Nov 17, 2017
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iMac (Retina 5K, 27-inch, 2019).

Actually, the latest Intel iMac 27" models were 2020:

Screen Shot 2022-04-16 at 8.22.20 PM.png


 
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CoastalOR

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Jan 19, 2015
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Actually, the latest Intel iMac 27" models were 2020:

View attachment 1992549

The 2020 iMac 27" shipped with Catalina (10.15.6).


Screen Shot 2022-04-16 at 17.36.11.jpg
 

usagora

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The 2020 iMac 27" shipped with Catalina (10.15.6).


View attachment 1992551

OP said that "could" run Mojave. Can you not install Mojave on a 2020 iMac if you have the installer and the know-how or does the 2020 iMac hardware have some sort of block built in to not allow this (not sure why it would)? On Apple's website, the macOS Mojave hardware requirements simply say "late 2012 or newer" for iMac. They don't give a cutoff date for the iMac year.

 

CoastalOR

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OP said that "could" run Mojave. Can you not install Mojave on a 2020 iMac if you have the installer and the know-how or does the 2020 iMac hardware have some sort of block built in to not allow this (not sure why it would)?
Apple does not support Mac OS versions older than what was installed during the original Mac release date. An older OS does not have the hardware drivers to support newer hardware.
 

usagora

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Apple does not support Mac OS versions older than what was installed during the original Mac release date. An older OS does not have the hardware drivers to support newer hardware.

There seems to be a workaround if you really want to though (haven't tried myself, so I can't verify):


In any case, I'm sure a 2019 iMac would suit the OP just as well as a 2020, so it's probably not a big deal either way.
 

CoastalOR

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Mojave is key for me, will it run on the 2019 or 2020 model please ?
iMac (Retina 5K, 27-inch, 2019) is the newest iMac that supports Mojave. It was originally shipped from Apple with Mojave installed (10.14.4) when the 2019 27" iMac was released. Mojave will run and is supported by Apple.

Any newer iMacs like a 2020 do not support Mojave because drivers for the hardware are not included in Mojave. The 2020 iMac was originally shipped from Apple with Catalina installed. Apple never supported Mojave on the 2020 27" iMac. DO NOT get a 2020 iMac if you want to run Mojave.
 
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Mr. Awesome

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Feb 24, 2016
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There seems to be a workaround if you really want to though (haven't tried myself, so I can't verify):


In any case, I'm sure a 2019 iMac would suit the OP just as well as a 2020, so it's probably not a big deal either way.
This article is referring to models that originally were shipping with Mojave but then began shipping with Catalina pre-installed instead. E.G. Catalina was installed on these models at some point in time. Similarly to how the iPhone XR originally shipped with iOS 12, but now comes with the latest version pre-installed.
 
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winterquilt

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Feb 18, 2008
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This article is referring to models that originally were shipping with Catalina but then began shipping with Mojave pre-installed instead. E.G. Catalina was installed on these models at some point in time. Similarly to how the iPhone XR originally shipped with iOS 12, but now comes with the latest version pre-installed.
But that still means that the hardware is natively Mojave compatible, correct ?
 

chrfr

macrumors G5
Jul 11, 2009
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But that still means that the hardware is natively Mojave compatible, correct ?
No, only the 2019 iMac can run Mojave. There were some models where the OS got upgraded part way through the production run, and those particular models can be downgraded to whatever the original macOS version was out when they were first released. For instance, I got some 2020 iMacs that shipped with Big Sur, but needed to run Catalina for app compatibility reasons, so I downgraded them to Catalina. Those 2020 iMacs cannot run Mojave, whatsoever.
 
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winterquilt

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Feb 18, 2008
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No, only the 2019 iMac can run Mojave. There were some models where the OS got upgraded part way through the production run, and those particular models can be downgraded to whatever the original macOS version was out when they were first released. For instance, I got some 2020 iMacs that shipped with Big Sur, but needed to run Catalina for app compatibility reasons, so I downgraded them to Catalina. Those 2020 iMacs cannot run Mojave, whatsoever.
Fine, I'll just go for a 2019 iMac, no problem.
 

Mr. Awesome

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Feb 24, 2016
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I am really confused now.

So the 2019 model runs Mojave.

I can forget about the 2020 model.
Indeed. Essentially, the 2020 models shipped with Catalina and can’t be downgraded. The 2019 models originally shipped with Mojave, so even 2019 models that later shipped with Catalina can still be downgraded back to Mojave.
 
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