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

NEMIX RAM

NEMIX RAM 128GB (2x64GB) DDR5 4800 ECC RDIMM FatTwin SYS-F521E3-RTB SYS-F511E2-RT X13SEFR-A memory upgrade

SKU CH-YM56-BDHRY

DDR5 4800 ECC RDIMM kit adds 128 GB in two 64 GB modules for SuperMicro FatTwin SYS-F521E3-RTB, SYS-F511E2-RT and X13SEFR-A servers

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 128GB kit expands server capacity for heavy workloads
  • DDR5 4800 speed delivers high bandwidth for data-intensive tasks
  • ECC registered design protects data integrity in mission-critical systems
  • 10V operation reduces power draw per module
  • Validated for SuperMicro FatTwin SYS-F521E3-RTB and SYS-F511E2-RT

128GB DDR5 4800 ECC RDIMM Kit

This 128GB kit contains two 64GB DDR5 4800 ECC RDIMM modules built for SuperMicro FatTwin SuperServer systems. It targets administrators who need registered, error-correcting memory for SYS-F521E3-RTB, SYS-F511E2-RT or X13SEFR-A platforms.

DDR5 4800 Registered Limits

DDR5 4800 (PC5-38400) operates at 1.10V with CL40 latency and a 2Rx4 organisation across 288 pins. Registered buffering and ECC are mandatory for these servers; unbuffered or non-ECC modules will not function.

Upgrade From Lower Capacity or Speed

Replacing smaller DDR5 kits or slower registered memory adds capacity for virtualisation density and bandwidth for memory-bound workloads. The jump is worthwhile when current slots are filled or when workloads exceed the throughput of lower-speed registered DIMMs.

How it compares

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

Price $3,320.99
Pricier than about 74% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (2 × 64 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $25.95 per GB
Pricier than about 71% 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 numberMR38400-924K2
Total capacity128 GB (2 × 64 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 rank2Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsSupermicro
In the box
Included items128 GB (2 × 64 GB) DDR5 4800 MHz PC5-38400 2Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Should I choose the 128GB kit or a single 64GB module for my SuperMicro FatTwin?

The 128GB kit provides two matched 64GB modules for dual-channel operation. A single module would halve capacity and bandwidth.

What does the DDR5 4800 rating deliver in a real SuperServer SYS-F521E3-RTB?

It runs at 4800 MT/s with CL40 latency at 1.1V, giving the maximum standard bandwidth the platform supports without overclocking.

How does the 288-pin RDIMM interface limit usable speed in this server?

The registered 288-pin DDR5 slot caps operation at the JEDEC 4800 MT/s spec; faster modules will downclock to this rate.

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