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Two green DDR5 RDIMM sticks, no heat spreaders, 288-pin, 256GB kit

NEMIX RAM

NEMIX RAM 256GB (2x128GB) DDR5 4800 CL40 4Rx4 ECC RDIMM SuperMicro SSG-521E X13SEDW memory upgrade

SKU CH-3AY9-FY7HE

256 GB (2 × 128 GB) DDR5 4800 CL40 4Rx4 ECC registered RDIMM kit validated for SuperMicro SSG-521E and X13SEDW servers

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256 GB capacity scales memory-heavy workloads on SuperMicro SSG-521E X13SEDW
  • DDR5 4800 speed with CL40 latency supports high-throughput server tasks
  • ECC registered design detects and corrects single-bit errors for data integrity
  • 1 V operation lowers power draw across 2 x 128 GB modules
  • 288-pin 4Rx4 RDIMM form factor fits validated SuperMicro server slots

System-Specific 256 GB DDR5 Kit

This NEMIX RAM kit delivers 256 GB of DDR5 memory in two 128 GB modules built for SuperMicro platforms. It runs at 4800 MHz with CL40 latency and operates at 1.1 V. The modules are ECC registered RDIMMs using a 4Rx4 organisation and 288-pin connectors.

Suited for SuperMicro SSG-521E and X13SEDW servers

This memory targets administrators upgrading compatible SuperMicro Storage SuperServer systems. It is not suitable for workstations or desktops that require unbuffered UDIMMs, nor for platforms that cannot accept registered ECC RDIMMs or the 4Rx4 rank configuration.

4Rx4 registered ECC RDIMM form factor

The decisive specification is the 4Rx4 registered ECC RDIMM layout on a 288-pin DDR5 module. Only systems qualified for this exact rank and buffer type will post and run stably with this kit.

How it compares

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

Price $8,193.99
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 $32.01 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 lineSuperMicro Server/Workstation Compatible Series Memory
Model nameSuperMicro DDR5 4800 MHz ECC RDIMM Registered Server Memory
Part numberMR38400-744K2
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
Heat spreaderNo
Memory rank4Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsSupermicro
In the box
Included items256 GB (2 × 128 GB) DDR5 4800 MHz PC5-38400 4Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Does the SuperMicro SSG-521E X13SEDW need a specific BIOS revision before these 4Rx4 DDR5 4800 ECC RDIMMs will post?

The modules are DDR5 4800 PC5-38400 CL40 1.10 V 4Rx4 ECC registered 288-pin RDIMMs built with major OEM Samsung Micron Hynix chips and validated for the SSG-521E-E1CR24H SSG-521E-E1CR24L X13SEDW platform.

If I keep existing DDR5 4800 ECC RDIMMs in the remaining slots, will this 256 GB 2x128 GB kit run at its rated 4800 MT/s CL40?

Matching speed voltage rank and registered ECC type across all populated channels lets the memory controller train at DDR5 4800; mixing different ranks or latencies can force the system to the lowest common denominator.

How can I verify the kit is operating at DDR5 4800 CL40 1.10 V with ECC active after installation?

Enter the system BIOS or UEFI and confirm the memory frequency reads 4800 MT/s, CAS latency shows CL40, voltage reports 1.10 V, and ECC status is enabled for each 128 GB module.

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