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Four green DDR4 LRDIMM modules with black chips and gold contacts

A-Tech

A-Tech 128GB Kit (4x32GB) DDR4 2666MHz ECC LRDIMM 288-Pin Memory Upgrade for Apple iMac Pro (Late 2017)

SKU CH-7PRD-Z2Q1D

128 GB kit of four 32 GB DDR4 2666 MHz ECC load-reduced 288-pin LRDIMM modules for the 27-inch iMac Pro (Late 2017)

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank2Rx4
  • 128 GB capacity across four 32 GB modules handles heavy multitasking
  • DDR4 2666 MHz PC4-21300 speed accelerates data throughput
  • ECC load-reduced design maintains data integrity under load
  • 288-pin LRDIMM form factor fits iMac Pro (Late 2017) slots
  • 20 V operation reduces power draw per module

128 GB DDR4 2666 MHz ECC LRDIMM kit

This 128 GB kit contains four 32 GB DDR4 2666 MHz ECC Load Reduced DIMMs built for the Apple iMac Pro (Late 2017). Each module runs at 1.20 V and uses a 288-pin LRDIMM form factor with 2Rx4 organisation. The memory is validated for Apple order number MQ2Y2LL/A and model identifiers iMacPro1,1 and A1862 (EMC 3144).

Who this suits and who should look elsewhere

The kit suits owners of the Late 2017 iMac Pro who need the maximum 128 GB capacity with ECC error correction. Users whose iMac Pro already contains 128 GB will not gain capacity. Buyers with any other Mac model or with a non-ECC DDR4 platform cannot use these LRDIMM modules.

Deciding specification — ECC Load Reduced LRDIMM

The defining specification is the ECC Load Reduced LRDIMM design. The iMac Pro (Late 2017) memory controller requires registered ECC LRDIMMs; standard unbuffered UDIMMs or RDIMMs will not function in this system.

How it compares

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

Price $790.99
Pricier than about 58% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $6.18 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 capacity128 GB (4 × 32 GB)
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportYes
Buffer typeLoad Reduced
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple Mac Systems

Questions about this item

Does the DDR4 2666 interface limit the kit to PC4-21300 bandwidth in the iMac Pro?

Yes, the modules run at DDR4 2666/2667 MHz, which corresponds to the PC4-21300 data rate supported by the iMac Pro (Late 2017).

Will four 288-pin LRDIMM modules fit the iMac Pro (Late 2017) memory slots?

The iMac Pro (Late 2017) uses four DDR4 LRDIMM slots; each 32 GB module in this kit is a 288-pin LRDIMM, so all four install directly.

What is the correct installation sequence for the four LRDIMMs in the iMac Pro?

Power off and unplug the iMac, lay it face-down on a soft cloth, press the memory compartment door release, then insert each 2Rx4 LRDIMM until the ejectors click — a common mistake is not seating the module fully before closing the door.

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