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Two green circuit-board sticks with black chips, no heat spreader, 260-pin SODIMM form factor

A-Tech

A-Tech 8GB Kit (2x4GB) DDR4 2133MHz SODIMM 260-Pin for iMac 21.5 Mid 2017

SKU CH-R4VW-S5MXR

DDR4 2133 MHz 8 GB kit (2 × 4 GB) SODIMM 260-pin for iMac 21.5 Mid 2017

  • Capacity8GB (2 x 4GB)
  • SpeedDDR4 2133 (PC4 17000)
  • Voltage1.20V
  • ECCNo
  • Buffered/RegisteredUnbuffered
  • Rank1Rx8
  • 8GB dual-channel kit speeds up iMac multitasking
  • DDR4 2133 MHz matches factory memory spec
  • 260-pin SODIMM fits 21.5-inch Mid 2017 iMac exactly
  • 20 V low-voltage modules run cool without spreaders
  • Apple-certified compatibility with model iMac18,1 and EMC 3068

Targeted iMac Memory Upgrade

This 8 GB DDR4 kit (2 x 4 GB) is built for the 21.5-inch iMac released in mid 2017. It matches the factory DDR4 2133 MHz specification and uses the 260-pin SODIMM form factor required by that model. The modules are non-ECC, unbuffered, and run at 1.20 V.

Drop-In Installation

Each stick fits directly into the iMac’s two SO-DIMM slots without adapters or configuration changes. The 1Rx8 rank layout matches the system’s memory controller expectations, so the computer recognises the full 8 GB immediately after the cover is replaced and the machine restarts.

Replaces Slower Base Configurations

The kit upgrades iMacs that shipped with 4 GB or 8 GB of slower memory, eliminating the bottleneck that appears when multiple apps or browser tabs compete for RAM. It does not serve machines that require ECC, registered DIMMs, or a different DDR generation.

Highlights

  • 8GB dual-channel kit speeds up iMac multitasking
  • DDR4 2133 MHz matches factory memory spec
  • 260-pin SODIMM fits 21.5-inch Mid 2017 iMac exactly
  • 20 V low-voltage modules run cool without spreaders
  • Apple-certified compatibility with model iMac18,1 and EMC 3068

Specifications

BrandA-Tech
SeriesA-Tech DDR4 Apple Mac RAM Memory Upgrades
Capacity8GB (2 x 4GB)
SpeedDDR4 2133 (PC4 17000)
Voltage1.20V
ECCNo
Buffered/RegisteredUnbuffered
Rank1Rx8
ChipsetMajor Brand Chipset
Heat SpreaderNo
Compatible SystemApple Mac Systems
FeaturesMajor Brand Chips

Questions about this item

Does the 2133 MHz DDR4 speed limit bandwidth during sustained workloads?

The modules run at DDR4 2133 MHz (PC4-17000), which sets the maximum data rate for continuous use.

How much heat or power do the 1.20 V unbuffered SODIMMs produce when running all day?

At 1.20 V without a heat spreader, the 1Rx8 chips generate typical DDR4 SODIMM thermals for a 21.5-inch iMac chassis.

Which iMac model identifiers must the machine already show for this 260-pin kit to work?

The system must report iMac18,1 or match Apple order number MMQA2LL/A and model A1418 (EMC 3068).

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