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Four green DDR4 LRDIMM modules with black chips, no heat spreaders

NEMIX RAM

NEMIX RAM ML21300-944K4 256GB (4x64GB) DDR4 2666 ECC LRDIMM CL19 memory upgrade

SKU CH-3TN8-VFF31

256 GB DDR4 2666 ECC LRDIMM kit in four 64 GB modules at CL19 and 1.2 V for ASRock EPYC server boards

  • 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

Capacity 256GB 4X64GB

  • 256GB total capacity across four 64GB modules
  • DDR4 2666MHz speed with PC4-21300 bandwidth rating
  • ECC LRDIMM load-reduced design for server reliability
  • CL19 latency at 1.2V operating voltage
  • 288-pin 4Rx4 configuration compatible with ASRock Rack ROMED8-2T EPYC motherboard

ASRock EPYC DDR4 LRDIMM kit

This 256GB kit contains four 64GB DDR4 2666 load-reduced ECC modules built for the ASRock Rack ROMED8-2T motherboard. Each module runs at 1.2V with CL19 latency and a 4Rx4 organisation. The 288-pin LRDIMM form factor targets EPYC server platforms that require registered memory.

Upgrade from lower-capacity RDIMM or non-ECC memory

Replacing smaller RDIMM kits or unbuffered modules with this 4Rx4 LRDIMM set increases total capacity to 256GB while maintaining error correction. The jump is worthwhile when workloads exceed the addressable limits of standard registered DIMMs or when the platform specifically requires load-reduced topology for signal integrity.

Verify motherboard slot count and BIOS revision

Confirm the ROMED8-2T has four available DDR4 slots and that the current BIOS supports 64GB LRDIMM density per slot. Check the system documentation for any population rules that restrict mixing ranks or require specific slot filling order before installation.

How it compares

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

Price $844.99
Pricier than about 59% 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 $3.30 per GB
Cheaper than about 88% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineASRock Server Motherboard Compatible Series Memory
Model nameASRock 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 systemsASRock
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

Other versions of this model

5 more in the same range

Questions about this item

Does the 288-pin LRDIMM fit the ASRock Rack ROMED8-2T memory slots?

Yes, the kit is built for that motherboard and uses the standard 288-pin DDR4 LRDIMM form factor required by the EPYC platform.

What BIOS setting or population rule is often missed when installing four 64 GB LRDIMMs?

The board expects a specific slot sequence for quad-rank LRDIMMs; skipping the manual’s population order is the step most installers get wrong.

How can I tell when one of the four 64 GB modules needs replacement?

ECC will log correctable errors; a rising count on any single DIMM signals that module should be swapped before uncorrectable faults appear.

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