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Four green DDR5 RDIMM modules in anti-static tray

NEMIX RAM

NEMIX RAM 256GB (4x64GB) DDR5 4800 CL40 ECC RDIMM for SuperMicro SYS-111C-NR SYS-521C-NR X13SEDW-F

SKU CH-M8MA-N5F84

256 GB DDR5 ECC registered server memory kit of four 64 GB modules at 4800 MT/s CL40 for SuperMicro SYS-111C-NR, SYS-521C-NR and X13SEDW-F

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256GB total capacity across four 64GB modules
  • DDR5 4800 speed rated at PC5-38400 bandwidth
  • ECC registered RDIMM protects data integrity under load
  • CL40 CAS latency at 1.10V operating voltage
  • Validated for SuperMicro SYS-111C-NR SYS-521C-NR X13SEDW-F systems

256GB DDR5 4800 ECC RDIMM Kit

This 256GB kit contains four 64GB DDR5 4800 registered DIMMs with ECC and CL40 latency. It is built for SuperMicro SYS-111C-NR, SYS-521C-NR and X13SEDW-F servers and workstations that require registered memory.

DDR5 4800 Platform Limits

DDR5 4800 operates at 1.1V and uses a 288-pin RDIMM form factor with on-die ECC and registered buffering. Maximum capacity and population rules are set by the motherboard and CPU memory controller, not by the modules alone.

Upgrading from Lower-Capacity DDR5 RDIMMs

Replacing smaller DDR5 RDIMMs with this 4x64GB kit fills four slots to reach 256GB, which is worthwhile when workloads exceed the current memory ceiling. It is not for systems that only accept unbuffered UDIMMs or that are limited to lower maximum capacities per slot.

How it compares

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

Price $7,110.99
Pricier than about 83% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $27.78 per GB
Pricier than about 78% 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 numberMR38400-924K4
Total capacity256 GB (4 × 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 items256 GB (4 × 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 256GB kit of four 64GB modules or a different capacity for my SuperMicro server?

The kit provides 256GB total using four 64GB DDR5 4800 CL40 ECC RDIMMs; choose it when your SuperMicro SYS-111C-NR, SYS-521C-NR or X13SEDW-F platform requires that exact capacity and registered DIMM configuration.

What does the DDR5 4800 CL40 rating mean once the modules are installed in a real system?

The memory will run at 4800 MT/s with a CAS latency of 40 cycles, delivering PC5-38400 bandwidth while the registered buffer and on-die ECC maintain data integrity under sustained server workloads.

How does the 288-pin DDR5 RDIMM interface limit performance in practice?

The 288-pin registered DDR5 form factor operates at 1.1V and caps the kit at the JEDEC-standard 4800 MT/s data rate, so the system cannot exceed that speed without overclocking support that these modules are not rated for.

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