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Four green DDR4 LRDIMM modules in anti-static tray

NEMIX RAM

NEMIX RAM 256GB (4x64GB) DDR4 2666 ECC LRDIMM memory upgrade for Apple iMac Pro 2017-2021

SKU CH-P0AW-2XJ4Q

256 GB of DDR4 ECC LRDIMM memory in four 64 GB modules running at 2666 MHz for Apple iMac Pro 2017‑2021

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeLoad Reduced
  • Rated voltage1.2 V
  • 256 GB capacity across four 64 GB modules
  • DDR4 2666 speed for iMac Pro 2017-2021
  • ECC and load-reduced design protects data integrity
  • 2 V operation reduces power draw
  • 288-pin LRDIMM form factor fits Apple iMac Pro

NEMIX RAM 256GB kit for iMac Pro 2017-2021

This 256GB kit contains four 64GB DDR4 2666 LRDIMM modules built for the Apple iMac Pro 2017-2021. Each module runs at 1.20V with CL19 latency and uses 4Rx4 load-reduced ECC chips. The 288-pin form factor matches the workstation memory slots.

Suits editors and engineers maxing out 256GB

Professionals who need the full 256GB capacity supported by the iMac Pro will use every module. Buyers who only need a smaller upgrade or who plan to mix capacities should look elsewhere because this kit fills all four slots with matched 64GB sticks.

4Rx4 load-reduced ECC at 2666MT/s

The modules are 4Rx4 load-reduced ECC DDR4 rated at 2666MT/s (PC4-21300). This rank and buffering combination is what the iMac Pro memory controller expects; a different rank or unbuffered type will not work.

How it compares

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

Price $932.99
Pricier than about 60% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $3.64 per GB
Cheaper than about 86% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineApple iMac/Mac Mini Compatible Series Memory
Model nameApple DDR4 2666 MHz ECC LRDIMM Load Reduced Server Memory
Part numberML21300-944K4
Total capacity256 GB (4 × 64 GB)
Product type288-Pin DDR4 LRDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeLoad Reduced
Heat spreaderNo
Memory rank4Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple
In the box
Included items256 GB (4 × 64 GB) DDR4 2666 MHz PC4-21300 4Rx4 1.2 V CL19 288-PIN ECC LRDIMM Load Reduced Server Memory KIT

Questions about this item

Should I choose the 4 x 64 GB kit or a different capacity for my iMac Pro?

This kit provides 256 GB total across four 64 GB modules, filling all four slots of the 2017-2021 iMac Pro for maximum supported memory.

What does the 2666 MHz rating mean once the modules are installed?

The memory runs at 2666 MHz (PC4-21300) with CL19 latency at 1.2 V, delivering the exact speed and timing the iMac Pro memory controller expects.

How does the 288-pin LRDIMM interface affect compatibility and limits?

The 288-pin DDR4 LRDIMM form factor with 4Rx4 organisation and ECC is required by the iMac Pro; it cannot accept standard UDIMMs or RDIMMs.

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