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Green circuit board with black memory chips, 260-pin SODIMM form factor, no heat spreader

A-Tech

A-Tech 16GB DDR4 2133 SODIMM 260-Pin for iMac 21.5 Mid 2017

SKU CH-1CZK-AK0NS

A 16 GB DDR4 2133 SODIMM module built for the 21.5-inch iMac (Mid 2017)

  • Total capacity16 GB
  • Rated speedDDR4 2133 (PC4 17000)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 16 GB DDR4 2133 MHz boosts multitasking speed
  • 260-pin SO-DIMM fits 21.5-inch iMac Mid 2017
  • 20 V low-voltage design reduces power draw
  • Non-ECC unbuffered 2Rx8 ensures stable operation
  • Major-brand chips tested for reliability

16 GB DDR4 2133 SODIMM for 21.5-inch iMac Mid 2017

This 16 GB DDR4 2133 MHz SODIMM module is built for the Apple iMac 21.5-inch Mid 2017 (model identifiers iMac18,1 and A1418 EMC 3068). It fits the single 260-pin SO-DIMM slot and runs at 1.20 V without ECC or registered buffering.

Capacity and headroom for everyday workloads

The 16 GB module doubles the base 8 GB configuration found on many of these iMacs, letting macOS keep more apps and browser tabs resident in memory. It handles typical creative suites, virtual machines and large photo libraries comfortably, though memory-intensive video editing or 3D rendering will still hit the ceiling.

Upgrade path from the factory 8 GB stick

Replacing the original 8 GB DDR4 2133 SO-DIMM with this 16 GB unit is the only internal memory upgrade the platform supports. The jump is worthwhile when the system frequently swaps to SSD during multitasking; if the workload stays light, the existing module remains adequate.

How it compares

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

Price $89.99
Cheaper than about 69% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $5.62 per GB
Cheaper than about 69% 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 capacity16 GB
Performance
Rated speedDDR4 2133 (PC4 17000)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportNo
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple Mac Systems

Questions about this item

Will the 16GB DDR4 2133 SODIMM run alongside the original 8GB module in my iMac 21.5 Mid 2017?

Yes, the module uses the same DDR4 2133 specification and 260-pin SO-DIMM form factor as the factory memory, so it will operate together with the existing 8GB stick in the second slot.

How can I verify the new 16GB module is recognised at 2133 MHz after installation?

Open About This Mac and click System Report; the Memory section will show a 16GB DDR4 SO-DIMM running at 2133 MHz with a 2Rx8 rank configuration.

Does the box contain only the 16GB SODIMM or are tools and an anti-static strap included?

The package includes the single 16GB DDR4 2133 SODIMM module only; no installation tools or anti-static accessories are supplied.

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