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Two green DDR4 LRDIMM modules, 288-pin, no heat spreader

NEMIX RAM

NEMIX RAM 128GB (2x64GB) DDR4 2933MHz CL21 ECC LRDIMM Apple Mac Pro Rack 2020 memory upgrade

SKU CH-XNYJ-EEFKD

128 GB of DDR4 ECC LRDIMM memory in a 2 × 64 GB kit running at 2933 MHz CL21 for the 2020 Mac Pro Rack

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL21
  • Buffer typeLoad Reduced
  • Rated voltage1.2 V
  • 128 GB total capacity from two 64 GB modules
  • DDR4 2933 MHz speed rated at PC4-23400
  • ECC error correction protects data integrity
  • Load Reduced DIMM design lowers electrical load
  • 20 V operation reduces power draw

128GB DDR4 2933 ECC LRDIMM Kit

This 128GB kit consists of two 64GB DDR4 2933MHz CL21 ECC LRDIMM modules built for the Apple Mac Pro Rack 2020. Load-reduced architecture and registered ECC operation deliver the signal integrity and error correction required by macOS workstations running sustained compute workloads. The 1.2V operating voltage matches the platform specification.

Upgrading from lower-capacity or non-ECC DIMMs

Replacing smaller RDIMMs or unbuffered modules with this 4Rx4 LRDIMM kit removes the capacity ceiling that limits virtualisation hosts, large dataset processing and multi-user database services. The jump is worth it when the Mac Pro reports memory pressure or when ECC corrections appear in system logs during production tasks.

Sustained-load behaviour in a Mac Pro Rack

Under continuous load the load-reduced design reduces electrical loading on the memory bus, allowing all twelve slots to remain populated at 2933MHz without down-clocking. ECC scrubbing corrects single-bit errors in real time while the 1.2V supply keeps thermal output predictable inside the Mac Pro’s directed-airflow chassis.

How it compares

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

Price $620.99
Pricier than about 54% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (2 × 64 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $4.85 per GB
Cheaper than about 79% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineApple Mac Pro Compatible Series Memory
Model nameApple DDR4 2933 MHz ECC LRDIMM Load Reduced Server Memory
Part numberML23400-944K2
Total capacity128 GB (2 × 64 GB)
Product type288-Pin DDR4 LRDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL21
ECC supportYes
Buffer typeLoad Reduced
Heat spreaderNo
Memory rank4Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsApple
In the box
Included items128 GB (2 × 64 GB) DDR4 2933 MHz PC4-23400 4Rx4 1.2 V CL21 288-PIN ECC LRDIMM Load Reduced Server Memory KIT

Questions about this item

Does this 288-pin LRDIMM kit fit the Apple Mac Pro Rack 2020 memory slots?

Yes, the 288-pin DDR4 LRDIMM form factor matches the Mac Pro Rack 2020 DIMM slots exactly.

What is the correct way to install the two 64 GB modules so the system recognises all 128 GB?

Insert each module into the paired slots indicated in the Mac Pro Rack memory guide; the common mistake is populating non-paired slots, which leaves half the capacity unseen.

Will the Samsung, Micron or Hynix chips on these ECC LRDIMMs need any firmware updates or periodic replacement?

No firmware updates are required for the DRAM chips; ECC corrects errors in real time, and the modules are rated for continuous operation without scheduled replacement.

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