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Four green circuit boards with black chips, 260-pin SODIMM modules

A-Tech

A-Tech 16GB (4x4GB) DDR4 2400 SODIMM 260-Pin memory upgrade for iMac 27-inch Mid 2017

SKU CH-HZS2-2ZS8A

A 16 GB DDR4 kit with four 4 GB SODIMM modules at 2400 MHz for the 27‑inch iMac from 2017

  • Total capacity16 GB (4 × 4 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank1Rx16
  • 16 GB kit of four 4 GB modules for smoother multitasking
  • DDR4 2400 MHz speed accelerates application loading
  • 260-pin SODIMM form factor fits 27-inch iMac Mid 2017
  • 20 V low-voltage design reduces power draw
  • Lifetime warranty plus US-based support protects your investment

Targeted iMac upgrade

This 16 GB kit contains four 4 GB DDR4 2400 SODIMM modules built for the 27 inch iMac released in mid 2017. It matches the factory specification for model identifier iMac18,3 and order numbers MNE92LL/A, MNEA2LL/A and MNED2LL/A. Owners of that exact machine can fill every slot with a single purchase. Buyers with any other Mac, a different iMac size or a later year cannot use this kit.

Plug in and run

Each module is an unbuffered non ECC 1Rx16 stick without a heat spreader, operating at the standard 1.20 V. The 260 pin SO DIMM keying lines up with the iMac memory door so installation takes minutes and requires no tools. Because the kit uses major brand chips validated for Apple systems, the firmware recognises the memory at full 2400 MHz speed without manual configuration. Systems that need ECC, registered DIMMs or a different pin count will not accept these modules.

From 8 GB to 16 GB

The kit replaces the common 8 GB factory configuration by populating all four slots with 4 GB modules, doubling the total capacity. The jump is worthwhile when the current Mac slows down under multiple browser tabs, photo libraries or virtual machines. If the iMac already has 16 GB or more, or if the workload fits comfortably in 8 GB, the upgrade adds no benefit.

How it compares

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

Price $115.99
Cheaper than about 66% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (4 × 4 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $7.25 per GB
Cheaper than about 56% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameA-Tech
Product lineA-Tech DDR4 Apple Mac RAM Memory Upgrades
Total capacity16 GB (4 × 4 GB)
Performance
Rated speedDDR4 2400 (PC4 19200)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx16
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple Mac Systems

Questions about this item

What does the DDR4 2400 PC4-19200 interface limit the memory speed to on this iMac?

The modules run at 2400 MHz with a PC4-19200 data rate, which is the maximum speed supported by the iMac 27-inch Mid 2017 memory controller.

What physical slot and module dimensions are required to fit the 260-pin SODIMM kit?

Each 4 GB module uses the standard 260-pin SO-DIMM form factor that matches the four memory slots inside the iMac 27-inch Mid 2017.

How are the four modules installed, and what step do people often miss?

Power off the iMac, unplug it, lay the screen face-down on a soft cloth, remove the memory access door, eject any existing modules, insert all four 4 GB sticks until they click, replace the door, then reconnect power.

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