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Two green SO-DIMM modules with black chips, no heat spreader

A-Tech

A-Tech 8GB Kit (2x4GB) DDR4 2400 SODIMM 260-Pin Memory Upgrade

SKU CH-HB5A-QDDG2

8GB DDR4 2400 SODIMM kit with two 4GB modules for select 21.5-inch and 27-inch iMac models from 2017 and 2019

  • Total capacity8 GB (2 × 4 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank1Rx16
  • Boosts multitasking with 8GB DDR4 2400MHz dual-channel kit
  • Two 4GB SODIMM modules install in matched pair
  • 260-pin form factor fits Mid 2017 and 2019 iMacs
  • 20V low-voltage operation reduces power draw
  • Major-brand chips tested for Mac compatibility

8 GB DDR4 2400 kit for Apple iMac

This two-module kit delivers 8 GB of DDR4 2400 memory in SO-DIMM form factor for compatible Apple iMac models from 2017 and 2019. It targets owners of the 21.5-inch Retina 4K and 27-inch Retina 5K iMacs who want a straightforward capacity increase without opening the system beyond the user-accessible memory door.

Low-voltage unbuffered modules run cool and quiet

Each 4 GB module operates at 1.20 V without ECC or registered buffering, so power draw stays modest and no active cooling is required. The 1Rx16 organisation and major-brand chips keep thermals predictable during typical desktop workloads such as web browsing, office suites and light creative tasks.

Replaces factory 8 GB

The upgrade makes sense when the original 8 GB soldered or slotted memory limits multitasking or when a 16 GB factory build still feels tight under heavier workloads. It is not for users who need 32 GB or more, who require ECC error correction, or who own iMac models outside the listed 2017 and 2019 model identifiers.

How it compares

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

Price $54.99
Cheaper than about 76% 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 $6.87 per GB
Cheaper than about 58% 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 capacity8 GB (2 × 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

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