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A2115/2019/ Procesador desde 3.0 GHz de 6 núcleos core i5, hasta 3.6 GHz de 8 núcleos i9. Lanzado el 19 de marzo 2019.

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iMac 27" 5k 2019 Memory upgrade

Can I leave the existing DIMMs that came with the system (2x4G) and add an additional 2x16G DIMMS for a total of 40G?

Do I need to place all the DIMMS in matched pairs of slots?. For example the 4G DIMMs in slots 1 & 3 and the 16G DIMMs in slots 2 & 4 or can the DIMMS go in any slots (4G DIMMs in slots 1 &2 and 16G DIMMS in slots 3&4)?

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Yes, just add them in the empty slots.

RAM Type:PC4-21300 DDR4 Min. RAM Speed:2666 MHz

Details:Supports 2666 MHz PC4-21300 DDR4 SDRAM SO-DIMMs (260-pin).

Standard RAM:8 GB Maximum RAM:128 GB*

Details:*By default, 8 GB of RAM is installed as two 4 GB memory modules (and two slots are unoccupied). At the time of purchase, Apple offers custom configurations of 16 GB, 32 GB, and 64 GB of memory for an extra US$200, US$600, and US$1000, respectively.

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Are you sure that's an optimum/ideal/recommended configuration?

Depending on how the northbridge/ram slots are configured, you might suffer from not having the same size of ram stick in each slot.

I've been looking to see if this is addressed rigorously anyware, and so far, no luck.

In this case one could try benchmarking it to see if you see any noticeable differences:

(1) 2 x 16

(2) 2 x 16 + 2 x 4

(3) 4 x 8

You can now buy new 16GB RAM for £69, so if there really is a need to upgrade the RAM on a £2k system, it seems best to do it thoroughly, especially since it's cheap to do it.

As in go to 32GB by 4 x 8GB, or else to 64GB by 4 x 16GB.

I think 2 x 16 + 2 x 4 is a potentially half-a&&ed measure.

If you can actually SEE any benefit from the extra 8GB (from the OEM 2 x 4GB) on top of the 32GB, then you should really go whole hog to 64GB (4 x 16GB).

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Is such a memory suitable?

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