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Two green DDR5 RDIMM modules in anti-static packaging

NEMIX RAM

NEMIX RAM 256GB (2x128GB) DDR5-4800 ECC RDIMM CL40 2Rx4 Supermicro X14SDV-20C-SP3F memory upgrade

SKU CH-8CDQ-FMM8F

A 256 GB DDR5-4800 ECC registered DIMM kit built to the exact rank, voltage and timing the Supermicro X14SDV-20C-SP3F motherboard expects

  • 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

  • 256GB total capacity from two 128GB modules for maximum server memory density
  • DDR5-4800 speed with CL40 latency delivers rated bandwidth for demanding workloads
  • Registered ECC architecture corrects single-bit errors and stabilises fully populated channels
  • 1V operating voltage matches the Supermicro X14SDV-20C-SP3F memory controller specification
  • 288-pin RDIMM form factor ensures exact fit in the validated motherboard slots

Server Memory Kit

This 256GB kit contains two 128GB DDR5 RDIMM modules built for the Supermicro X14SDV-20C-SP3F motherboard. Registered ECC architecture and a 2Rx4 organisation let the memory controller address full capacity across every populated slot. The modules run at 4800MHz with CL40 timing at 1.1V, matching the board's native specification. It is intended for administrators who need maximum registered capacity on this specific platform.

Sustained Operation

Registered buffering reduces electrical load on the memory controller so all slots remain stable when fully populated under continuous workloads. ECC circuitry detects and corrects single-bit errors in real time, preventing silent data corruption during long-running compute or database tasks. The 1.1V operating voltage keeps power draw consistent across extended duty cycles. No heat spreader is fitted, so chassis airflow must handle thermal dissipation.

Installation Notes

The 288-pin RDIMM form factor fits only registered DIMM slots; UDIMM or SODIMM sockets will not accept these modules. Population order follows the motherboard manual's approved sequence, which varies by CPU configuration and must be verified before installation. Mixing ranks or capacities can prevent the system from recognising the full 256GB. Buyers who need a different capacity or unbuffered memory should select another kit.

How it compares

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

Price $7,698.99
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 $30.07 per GB
Pricier than about 86% 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

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Questions about this item

Does the 1.1V operating voltage keep power draw and heat low when the server runs 24/7?

The modules run at 1.1V, which is the standard DDR5 voltage, helping limit power consumption and thermal output during continuous operation.

What motherboard slot and firmware support are required to use this 256GB kit?

The kit needs a Supermicro X14SDV-20C-SP3F motherboard with 288-pin RDIMM slots and BIOS that supports DDR5-4800 Registered ECC memory at 2Rx4 density.

Will the 2Rx4 Registered ECC design work alongside other DDR5 RDIMMs already installed in the same board?

Yes, if the board's memory population rules allow mixing 2Rx4 Registered ECC DIMMs at the same speed and voltage, the kit will operate together with existing modules.

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