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Green circuit board with black memory chips, 260-pin SODIMM form factor

A-Tech

A-Tech 8GB DDR4 2133MHz SODIMM 260-Pin for iMac 21.5 2017

SKU CH-CQKQ-HM288

8GB DDR4 2133MHz SODIMM upgrades compatible 21.5-inch iMac Mid 2017 systems

  • Total capacity8 GB
  • Rated speedDDR4 2133 (PC4 17000)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank1Rx8
  • 8GB DDR4 2133MHz boosts multitasking and speeds up loading times
  • 260-pin SODIMM form factor fits the iMac 21.5 Mid 2017 slot exactly
  • 20V low-voltage DDR4 reduces power draw and heat in the compact all-in-one
  • Tested with Major Brand chips for reliable operation in Apple model iMac18,1 A1418 EMC 3068
  • Non-ECC unbuffered 1Rx8 module installs easily for an immediate performance upgrade

8GB DDR4 2133MHz SODIMM for 21.5-inch iMac 2017

This 8GB module uses DDR4 2133MHz (PC4-17000) memory in a 260-pin SODIMM form factor. It runs at 1.20V and is unbuffered, non-ECC, single-rank 1Rx8. The stick is built with major-brand chips and contains no heat spreader. It is designed specifically for the Apple iMac (21.5-inch, Mid 2017) matching model ID iMac18,1 and order number MMQA2LL/A.

Who this suits and who should look elsewhere

It suits owners of the listed iMac who want to add or replace memory with a certified, tested module. It does not suit machines that require a different memory generation, pin count, voltage, ECC or registered operation, or a capacity other than 8GB per slot. Builders working on non-Apple platforms or newer Apple models should verify exact specifications before purchase.

The specification that decides fit

The decisive specification is the DDR4 2133MHz SODIMM 260-pin 1.20V unbuffered non-ECC 1Rx8 layout validated for iMac18,1 (A1418 EMC 3068). If your system demands a different speed, pin layout, voltage or error-correction type, this module will not work.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $45.99
Cheaper than about 79% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB
Lower than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $5.75 per GB
Cheaper than about 68% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameA-Tech
Product lineA-Tech DDR4 Apple Mac RAM Memory Upgrades
Total capacity8 GB
Performance
Rated speedDDR4 2133 (PC4 17000)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple Mac Systems

Questions about this item

Does this 260-pin DDR4 SODIMM fit the 21.5-inch iMac from 2017?

Yes, it is built for the iMac 21.5 Mid 2017 (model iMac18,1, EMC 3068, order MMQA2LL/A) and uses the 260-pin SO-DIMM form factor that the system requires.

What is the correct way to seat the module so the Mac recognises the full 8 GB?

Power off and unplug the iMac, open the memory door, insert the module at a slight angle until the gold contacts disappear, then press down firmly until both side clips click into place.

Will the 1.20 V DDR4 chips need any firmware update or periodic re-seating over time?

No firmware update is required; the module is non-ECC unbuffered and validated for the iMac. Under normal use it stays seated and needs no maintenance.

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