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Two green DDR5 RDIMM modules in anti-static packaging

NEMIX RAM

NEMIX RAM DDR5 256GB (2x128GB) 4800 CL40 ECC RDIMM Supermicro H14SST-G memory upgrade

SKU CH-MEWJ-A8WXH

A 256 GB DDR5 ECC registered DIMM kit (2 × 128 GB) running at 4800 MHz CL40, validated for the Supermicro H14SST-G motherboard

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered

Size 256GB 2X128GB

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  • 256 GB total capacity with two 128 GB modules for full server density
  • DDR5 4800 speed rated at PC5-38400 for rated throughput
  • CL40 CAS latency and 1.1 V operation matching controller expectations
  • ECC registered RDIMM corrects single-bit errors and buffers every slot
  • 288-pin RDIMM form factor verified for Supermicro H14SST-G motherboard

256GB DDR5 ECC RDIMM kit for Supermicro H14SST-G

This 256GB kit contains two 128GB DDR5 registered ECC RDIMMs rated at 4800 MT/s with CL40 latency and 1.1V operation. It is built for the Supermicro H14SST-G motherboard and targets administrators who need maximum registered memory capacity in a dual-module configuration.

Verify board population rules

The H14SST-G requires 288-pin registered DDR5 RDIMMs and its manual defines specific population sequences for full-capacity operation. Confirm the approved DIMM order, maximum supported capacity per slot, and any BIOS version requirements in the system documentation before installing this 2Rx4 kit.

Replaces smaller RDIMM sets when full registered

This kit upgrades from lower-density registered modules to reach 256GB in two slots while keeping ECC and registered buffering active. The jump is worth it when workloads demand the full registered address range and single-bit error correction at the board's native DDR5-4800 speed.

How it compares

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

Price $7,889.99
Pricier than about 84% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $30.82 per GB
Pricier than about 88% 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 numberMR38400-724K2
Total capacity256 GB (2 × 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 items256 GB 2 × 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

What comes in the 256 GB kit and do I need anything else to install it?

The kit contains two 128 GB DDR5 4800 CL40 2Rx4 1.1 V 288-pin ECC registered RDIMMs. No extra cables, brackets or heat spreaders are required; the modules plug directly into the Supermicro H14SST-G DIMM slots.

Why choose the 256 GB 2x128 GB DDR5-4800 CL40 kit instead of a different capacity or speed?

This exact 2Rx4 registered ECC configuration at 1.1 V and CL40 matches the Supermicro H14SST-G memory-controller requirements, so the board recognises the full 256 GB at rated DDR5-4800 speed without down-clocking.

What does DDR5-4800 CL40 mean for real-world server throughput?

The modules transfer data at 4800 MT/s with a 40-cycle CAS latency, delivering the bandwidth and error-correction stability the H14SST-G platform expects for fully populated, mission-critical workloads.

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