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Two green 288-pin DDR5 RDIMM modules without heat spreaders

NEMIX RAM

NEMIX RAM MR38400-924K2 128GB (2x64GB) DDR5 4800 ECC RDIMM for ASRock Rack SIENAD10HM3

SKU CH-6CTX-4V854

128 GB DDR5 4800 ECC registered RDIMM kit (2 × 64 GB, CL40, 1.10 V, 2Rx4) validated for the ASRock Rack SIENAD10HM3 motherboard

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered

Size 128GB 2X64GB

Show 3 more
  • 128 GB kit (2 × 64 GB) gives full rated capacity at DDR5-4800
  • Registered ECC design offloads the controller and corrects single-bit errors on the fly
  • CL40 timing at 1.1 V matches the memory controller's exact expectations
  • 288-pin RDIMM form factor fits the ASRock Rack SIENAD10HM3 motherboard
  • Major OEM Samsung, Micron or Hynix chips provide enterprise-grade stability

Targeted server upgrade

This 128GB kit delivers two 64GB DDR5 4800 Registered ECC RDIMMs built to the exact rank, voltage and timing the ASRock Rack SIENAD10HM3 expects. The 2Rx4 organisation and 1.10V operation let the memory controller recognise full capacity immediately. It is not for builders who need UDIMM or SODIMM form factors.

Sustained throughput

Registered buffering offloads the memory controller so every slot runs fully populated at the rated 4800 MT/s without downclocking under continuous load. ECC corrects single-bit errors on the fly, preventing silent data corruption during long compute runs. The CL40 latency stays consistent across extended workflows.

Thermals and power

Modules operate at the standard 1.10V DDR5 voltage with no heat spreader, relying on chassis airflow for cooling. Power draw scales with the 2Rx4 density across the 288-pin interface. Noise is determined entirely by the server fans.

How it compares

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

Price $3,499.99
Pricier than about 75% 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 $27.34 per GB
Pricier than about 76% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameNEMIX RAM
Product lineNEMIX RAM Original Series Server Memory
Model nameDDR5 ECC RDIMM Registered Server Memory
Part numberMR38400-924K2
Total capacity128 GB (2 × 64 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsASRock Rack
In the box
Included items128 GB 2 × 64 GB DDR5 4800 MHz PC5-38400 2Rx4 1.1 V 288-PIN ECC RDIMM KIT

Other versions of this model

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Questions about this item

How much power does the DDR5 4800 kit draw at its rated 1.10 V when the server runs continuously?

Each module operates at 1.10 V, the standard DDR5 voltage, so total draw depends on how many of the 288-pin RDIMM slots your board populates and the memory controller load.

What motherboard slot type must already be present for these 288-pin RDIMMs to function?

The ASRock Rack SIENAD10HM3 must provide DDR5 RDIMM slots; the kit will not fit UDIMM or SODIMM sockets and requires the registered DIMM interface the board is designed for.

Will the registered ECC design work with older unbuffered DDR5 DIMMs still installed in other slots?

No, registered and unbuffered modules cannot be mixed on the same channel; the board expects a consistent registered ECC population across every populated slot.

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