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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

  • Total capacity8 GB (2 × 4 GB)
  • Rated speedDDR4 2133 (PC4 17000)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory 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.

How it compares

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

Price $48.99
Cheaper than about 78% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB (2 × 4 GB)
Lower than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $6.12 per GB
Cheaper than about 64% 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 (2 × 4 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 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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