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Four green DDR5 RDIMM modules with black chips, no heat spreaders

NEMIX RAM

NEMIX RAM 512GB 4x128GB DDR5 4800 CL40 1.1V 2Rx4 ECC Registered RDIMM Supermicro H14SST-G memory upgrade

SKU CH-HJ12-BJS0C

A 512 GB DDR5-4800 registered ECC kit of four 128 GB modules at CL40 and 1.1 V, validated for the Supermicro H14SST-G motherboard

  • Total capacity512 GB (4 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered

Size 512GB 4X128GB

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  • 512 GB total capacity from four 128 GB modules
  • DDR5-4800 speed with CL40 latency for rated throughput
  • 10 V registered ECC RDIMM architecture for full-slot stability
  • 2Rx4 dual-rank organisation matches controller expectations exactly
  • Verified fitment for Supermicro H14SST-G motherboard

Supermicro H14SST-G DDR5 RDIMM kit

This 512GB kit delivers four 128GB DDR5-4800 Registered ECC modules built to the exact rank, voltage and timing the Supermicro H14SST-G memory controller expects. The 288-pin RDIMM form factor matches the board's required slot type so the system recognises the full capacity at rated speed.

Registered ECC architecture with 2Rx4 organisation

Registered buffering offloads the memory controller to keep every slot stable when fully populated, while on-die ECC corrects single-bit errors before they reach production workloads. The 1.1V operating voltage and CL40 latency are the precise values the platform specifies for reliable operation.

Suits administrators upgrading a verified H14SST-G

Buyers who need a different capacity, a UDIMM form factor or non-ECC modules should look elsewhere, as this kit is spec-matched only for the listed motherboard and its registered DIMM population rules.

How it compares

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

Price $15,002.99
Pricier than about 90% of the 21,161 comparable items (median $397.99).
Total capacity 512 GB (4 × 128 GB)
Higher than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $29.30 per GB
Pricier than about 83% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineNEMIX RAM Original Series Server Memory
Model nameDDR5 ECC RDIMM Registered Server Memory
Part numberMR38400-724K4
Total capacity512 GB (4 × 128 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 systemsSupermicro
In the box
Included items512 GB 4 × 128 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

Will the 2Rx4 registered DIMMs need any firmware updates or recalibration after installation?

No firmware updates or recalibration are required; the kit matches the H14SST-G memory controller expectations for rank, voltage and timing so it is recognised at full capacity and rated speed on first boot.

What limit appears first when all four 128 GB modules run continuously at DDR5-4800?

The memory controller's maximum supported capacity and population rules are the first limit; the board manual defines the exact population order and any per-channel or per-socket ceilings.

How much heat and power do the 1.1 V modules generate during all-day operation?

Each module operates at 1.1 V with no heat spreader; registered buffering reduces electrical load on the controller, keeping power draw and thermals within standard DDR5 RDIMM limits for sustained server workloads.

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