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Four green DDR4 RDIMM modules without heat spreaders, 288-pin, 32GB each

A-Tech

A-Tech 128GB Kit (4x32GB) DDR4 2666MHz ECC Registered RDIMM 288-Pin for iMac Pro Late 2017

SKU CH-SQSS-730BN

A 128 GB DDR4 2666 MHz ECC registered RDIMM kit of four 32 GB modules for iMac Pro Late 2017

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4
  • 128 GB total capacity with four 32 GB modules
  • DDR4 2666 MHz speed rated PC4-21300
  • ECC registered RDIMM for error-correcting stability
  • 288-pin form factor fits iMac Pro Late 2017
  • Lifetime warranty backed by US-based technical support

iMac Pro Late 2017 memory kit

This 128 GB kit supplies four 32 GB DDR4 2666 MHz ECC registered RDIMM modules built for the iMac Pro (Late 2017). It matches the Apple order number MQ2Y2LL/A and model identifiers iMacPro1,1 and A1862 (EMC 3144). The kit targets professionals who need maximum supported capacity for video editing, 3D rendering or scientific workloads on this specific workstation.

Thermals noise and power profile

Each module operates at 1.20 V without a heat spreader, relying on the iMac Pro internal airflow for cooling. Registered ECC architecture adds minimal latency overhead while maintaining signal integrity at 2666/2667 MHz. Power draw scales with all four slots populated, but the system firmware manages voltage and refresh rates automatically under normal workloads.

Upgrade context and limits

This kit replaces the factory-installed memory when the original capacity is lower than 128 GB or when modules have failed. The jump is worthwhile when applications report memory pressure or when virtual memory swaps degrade throughput. It does not suit users who need higher frequencies, non-ECC modules or compatibility with other Mac models.

How it compares

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

Price $627.99
Pricier than about 54% 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 $4.91 per GB
Cheaper than about 78% 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 capacity128 GB (4 × 32 GB)
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple Mac Systems

Questions about this item

How do I install the four 32 GB DDR4 RDIMM modules in the iMac Pro Late 2017, and what step do people often miss?

Power off and unplug the iMac Pro, lay it face-down on a soft surface, remove the memory access door, eject the existing modules by pressing the side levers, then insert each 288-pin RDIMM until the levers click — the step most people miss is pressing both levers simultaneously so the module seats fully.

What maintenance or replacement will this 128 GB DDR4 ECC Registered kit need later?

The modules have no heat spreader and no moving parts, so no routine maintenance is required; replacement is only needed if a module fails, which is covered by the manufacturer's lifetime warranty.

What limit appears first under sustained heavy workloads with this DDR4 2666 MHz ECC RDIMM kit?

The memory controller in the iMac Pro Late 2017 caps the speed at 2666 MHz, so sustained workloads hit the bandwidth ceiling of the PC4-21300 specification before any thermal or voltage limit is reached.

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