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Two green DDR5 RDIMM modules with black chips, no heat spreaders, 288-pin server memory kit

NEMIX RAM

NEMIX RAM 256GB Kit (2x128GB) DDR5-6400 CL52 4Rx4 ECC RDIMM Supermicro X14SDI-36C-SP3F

SKU CH-CE4W-EYFAV

A 256 GB DDR5 server memory kit with two 128 GB registered ECC modules running at 6400 MHz CL52 and 1.1 V, validated for the Supermicro X14SDI-36C-SP3F motherboard

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL52
  • Rated voltage1.1 V
  • Buffer typeRegistered

Size 256GB 2X128GB

  • 256 GB capacity with two 128 GB modules for maximum server density
  • DDR5-6400 speed rated at PC5-51200 for high-throughput workloads
  • CL52 latency at 1.1 V balances responsiveness and power efficiency
  • Registered ECC 4Rx4 design corrects errors and stabilises fully populated channels
  • 288-pin RDIMM form factor validated for the Supermicro X14SDI-36C-SP3F motherboard

256GB DDR5-6400 ECC Kit for Supermicro X14SDI

This 256GB kit contains two 128GB DDR5-6400 Registered ECC RDIMMs built for the Supermicro X14SDI-36C-SP3F motherboard. Each module runs at 1.1V with CL52 latency and a 4Rx4 organisation. The registered design allows full-capacity operation across populated slots while ECC corrects single-bit errors on the fly. It is intended for administrators upgrading that specific platform.

Who This Kit Suits and Who Should Look Elsewhere

This kit suits IT teams expanding memory on a Supermicro X14SDI-36C-SP3F server that requires DDR5 Registered ECC RDIMMs. It will not work in systems that accept only unbuffered UDIMMs or SODIMMs. Buyers needing a different capacity, speed, voltage or form factor should look elsewhere.

The Deciding Specification: DDR5 Registered ECC

The single specification that decides compatibility is the DDR5 Registered ECC RDIMM form factor with 4Rx4 ranking at 1.1V. The Supermicro X14SDI-36C-SP3F memory controller expects this exact combination of registered buffering, ECC, rank structure and voltage. If your board calls for UDIMM, LRDIMM or a different voltage, this kit will not be recognised or will not train at DDR5-6400.

How it compares

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

Price $8,762.99
Pricier than about 85% 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 $34.23 per GB
Pricier than about 90% 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 numberMR51200-744K2
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 6400 (PC5 51200)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL52
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsSupermicro
In the box
Included items256 GB 2 × 128 GB DDR5 6400 MHz PC5-51200 4Rx4 1.1 V 288-PIN ECC RDIMM KIT

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Questions about this item

How do I install these 288-pin DDR5 RDIMMs in the Supermicro X14SDI-36C-SP3F and which slot order is the one people get wrong?

Power off the server, open the chassis, and insert each 128GB module into the 288-pin DDR5 RDIMM slots following the exact population sequence listed in the Supermicro X14SDI-36C-SP3F manual; the common mistake is filling slots out of order, which prevents the 256GB kit from being recognised at full capacity and 6400MHz speed.

What maintenance or replacement will this 4Rx4 ECC registered kit need over its service life?

No routine maintenance is required for the DDR5 RDIMMs themselves; ECC corrects single-bit errors automatically, and if a module ever fails the lifetime replacement warranty covers a direct swap of the affected 128GB stick.

What limit appears first when the 256GB kit runs sustained workloads at 6400MHz CL52?

The memory controller's thermal and electrical envelope is the first ceiling; the 4Rx4 registered design offloads the controller so all slots run fully populated at 1.1V, but prolonged maximum throughput will eventually hit the platform's cooling or power budget before the modules' own rating.

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