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Repair guides and support for 27" Intel iMacs by Apple, introduced October 2009.

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RAM configuration in bank/slot iMac late 2015

Sorry, I have heard that the procedure may has changed.

I want to add 2x8GB RAM to the exisitng 2x4GB (Bank 0 and 1/DIMM O = slot 1 and 3 from the bottom).

I may be wrong, but I was told to use the same amount of RAM/memory in each channel/bank, 12 in each, instead of same RAM.

the pristine configuration (4GB Slot 1 and 4GB Slot 3 - iMac Late 2015) would validate this (regarding to dual channel).

What is the correct configuration?

Thanks a lot.

BANK 0/DIMM0:

Größe: 4 GB

Typ: DDR3

Geschwindigkeit: 1867 MHz

Status: OK

BANK 0/DIMM1:

Größe: 8 GB

Typ: DDR3

Geschwindigkeit: 1867 MHz

Status: OK

BANK 1/DIMM0:

Größe: 4 GB

Typ: DDR3

Geschwindigkeit: 1867 MHz

Status: OK

BANK 1/DIMM1:

Größe: 8 GB

Typ: DDR3

Geschwindigkeit: 1867 MHz

Status: OK

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Usually you install in pairs to retain interleaving of the RAM. Apple does not mention your concern: https://support.apple.com/en-us/HT201191

Please give us a link to your concern.

Standard RAM: 8 GB Maximum RAM: 64 GB*

Details: By default, 8 GB is installed as two 4 GB memory modules (and two slots are unoccupied).

*Officially, this model supports four 8 GB modules -- one in each slot for a maximum of 32 GB of memory. However, as first discovered by OWC, it actually will support 64 GB of memory using four 16 GB modules.

*

RAM Type: PC3-14900 DDR3 Min. RAM Speed: 1867 MHz

Details: Supports 1867 MHz PC3-14900 DDR3 SDRAM SO-DIMMs (204-pin).

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From my experience - there isn’t much difference, as long as it works.

The modules don’t even need to be in pairs. In my (rather sad) situation - I had to remove a perfectly functioning 8GB module from slot 2, because it causes lots of crashes. The slot itself is faulty - so now I run with 3 8GB modules. Less RAM, but no crashes.

There is a good Memory-testing program called MemTest86 you can download for free, and use not only to validate your RAM modules, but also to benchmark your RAM performance, so you could re-order the modules to your liking and benchmark yourself.

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