Re: RAM advice - 27" iMac

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From	"David B." <BD@hotmail.co.uk>
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Subject	Re: RAM advice - 27" iMac
Date	Wed, 29 Oct 2025 18:24:27 +0000
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On 29/10/2025 15:28, Tyrone wrote:
> On Oct 29, 2025 at 8:02:51 AM EDT, "Another John" <lalaw44@hotmail.com> wrote:
> 
>> Hello all
>>
>> I have a 27" Retina iMac, year 2019.   Quite often, seems to be struggling:
>> spinning rainbow disc, slight hesitations in doing things, etc.
>>
>> I think it may be that Sequoia (15.6.1) is too 'heavy' for it - ???   I only
>> have 8GB RAM installed - 2x4GB DIMMs.
>> (My "other" 27" has 16GB, but that's vintage 2013, and I understand that that
>> RAM won't go into the 2019 one).
>>
>> I am thinking I ought to boost the RAM in the 2019 one. I've been led to
>> believe (by various discussions I found) that I should upgrade the RAM with
>> the same DIMMs as are already installed -- so I think my max upgrade will be
>> to 16GB (two more 4GB DIMMs).  [unless I go mad and buy, e.g. four 8GB DIMMs -
>> which would be beyond my budget.].
>>
>> Aside: briefly scanning the DIMM suppliers, it seems that 4GB DIMMs are now
>> quite hard to come by!
>>
>> Do you have any opinions about any of the above? If so, thanks in
>> anticipation,
> 
> The RAM specs for your iMac are here:
> 
> <https://support.apple.com/en-us/108317>
> 
> RAM sticks are typically installed in pairs. This has 4 slots and as you noted
> 4GB DIMMS are hard to find these days. So you could get two 8GB SO-DIMMS and
> keep your existing two 4GB SO-DIMMS and have 24GB total.
> 
> BTW this model can take up to 64GB total, 4 x 16GB.

What you say is 100% correct.

It is exactly how I upgraded *MY* 27 inch iMac! 🙂

Thread

RAM advice  - 27" iMac Another John <lalaw44@hotmail.com> - 2025-10-29 12:02 +0000
  Re: RAM advice  - 27" iMac Tyrone <none@none.none> - 2025-10-29 15:28 +0000
    Re: RAM advice - 27" iMac "David B." <BD@hotmail.co.uk> - 2025-10-29 18:24 +0000
  Re: RAM advice  - 27" iMac Theo <theom+news@chiark.greenend.org.uk> - 2025-10-29 17:40 +0000
    Re: RAM advice  - 27" iMac Theo <theom+news@chiark.greenend.org.uk> - 2025-10-29 18:01 +0000
  Re: RAM advice  - 27" iMac RJH <patchmoney@gmx.com> - 2025-10-30 00:47 +0000
    Re: RAM advice  - 27" iMac Tyrone <none@none.none> - 2025-10-30 00:55 +0000
      Re: RAM advice - 27" iMac Alan B <alanrichardbarker@gmail.com.invalid> - 2025-10-30 06:20 +0000
        Re: RAM advice - 27" iMac RJH <patchmoney@gmx.com> - 2025-10-30 07:08 +0000
        Re: RAM advice - 27" iMac Jaimie Vandenbergh <jaimie@usually.sessile.org> - 2025-10-30 09:25 +0000
          Re: RAM advice - 27" iMac Alan B <alanrichardbarker@gmail.com.invalid> - 2025-10-30 09:34 +0000
          Re: RAM advice - 27" iMac "David B." <BD@hotmail.co.uk> - 2025-10-30 11:04 +0000
          Re: RAM advice - 27" iMac Alan B <alanrichardbarker@gmail.com.invalid> - 2025-10-30 11:33 +0000
          Re: RAM advice - 27" iMac Mark <captain.black@gmail.com> - 2025-10-30 16:39 +0000
          Re: RAM advice - 27" iMac Another John <lalaw44@hotmail.com> - 2025-10-31 16:14 +0000
            Re: RAM advice - 27" iMac Theo <theom+news@chiark.greenend.org.uk> - 2025-10-31 16:37 +0000
            Re: RAM advice - 27" iMac "David B." <BDonBlockNews@invalid.invalid> - 2025-10-31 16:37 +0000
  Re: RAM advice  - 27" iMac Jaimie Vandenbergh <jaimie@usually.sessile.org> - 2025-10-30 09:22 +0000
    Re: RAM advice - 27" iMac "David B." <BD@hotmail.co.uk> - 2025-10-30 11:02 +0000
    Re: RAM advice  - 27" iMac Another John <lalaw44@hotmail.com> - 2025-11-13 14:59 +0000

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