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Two green DDR4 LRDIMM sticks, black chips, no heat spreaders

A-Tech

A-Tech 128GB Kit (2x64GB) DDR4 2666MHz ECC LRDIMM 288-Pin Memory Upgrade for Apple iMac Pro Late 2017

SKU CH-SRE2-2G5Q1

A 128 GB DDR4 ECC LRDIMM kit with two 64 GB modules running at 2666 MHz for the 2017 iMac Pro

  • Capacity128GB (2 x 64GB)
  • SpeedDDR4 2666 (PC4 21300)
  • Voltage1.20V
  • ECCYes
  • Buffered/RegisteredLoad Reduced
  • Rank4Rx4
  • 128 GB total capacity with two 64 GB modules
  • DDR4 2666 MHz speed rated PC4-21300
  • ECC Load Reduced design for error correction
  • 288-pin LRDIMM form factor fits iMac Pro
  • Validated for Apple iMac Pro Late 2017

Capacity and Compatibility

This 128GB kit contains two 64GB DDR4 LRDIMM modules built for the Apple iMac Pro Late 2017. The memory runs at 2666MHz with ECC load-reduced operation and a 1.20V voltage. It matches Apple order number MQ2Y2LL/A and model identifiers iMacPro1,1 and A1862 (EMC 3144).

Target System and Limitations

The kit is designed for owners of the 27-inch iMac Pro Retina 5K from Late 2017 who need the maximum supported memory capacity. Builders working on any other Mac model, Windows workstation, or standard PC platform should look elsewhere because the LRDIMM form factor and specific firmware tuning are exclusive to this system.

Decisive Specification

The load-reduced ECC LRDIMM architecture with 4Rx4 rank organisation is the single specification that determines fit; only systems that explicitly support DDR4 2666 LRDIMM memory can use these modules.

Besonderheiten

  • 128 GB total capacity with two 64 GB modules
  • DDR4 2666 MHz speed rated PC4-21300
  • ECC Load Reduced design for error correction
  • 288-pin LRDIMM form factor fits iMac Pro
  • Validated for Apple iMac Pro Late 2017

Technische Daten

BrandA-Tech
SeriesA-Tech DDR4 Apple Mac RAM Memory Upgrades
Capacity128GB (2 x 64GB)
SpeedDDR4 2666 (PC4 21300)
Voltage1.20V
ECCYes
Buffered/RegisteredLoad Reduced
Rank4Rx4
ChipsetMajor Brand Chipset
Heat SpreaderNo
Compatible SystemApple Mac Systems
FeaturesMajor Brand Chips

Fragen zu diesem Artikel

How do I install the 288-pin LRDIMM modules into the iMac Pro Late 2017, and which step is often missed?

Power off and unplug the iMac Pro, lay it face-down on a soft cloth, remove the memory access door with a screwdriver, eject the existing modules by pushing the side levers outward, align the notch on each 288-pin LRDIMM with the slot key, press firmly until the levers click back, then replace the door before powering on.

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

No routine maintenance is required; the modules have no heat spreader and run at 1.20V. If a module fails, replace the faulty 64GB stick — the lifetime warranty covers defects, but ECC errors that persist after reseating usually mean the module itself must be swapped.

What limit appears first under sustained heavy workloads with these 4Rx4 2666MHz modules?

The memory controller’s maximum supported speed of 2666MHz caps throughput; sustained loads will hit this bandwidth ceiling before thermal throttling occurs, since the LRDIMM design reduces electrical load on the controller.

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