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

NEMIX RAM

NEMIX RAM DDR5 256GB 2x128GB 6400 CL52 1.1V 2Rx4 RDIMM ECC Supermicro H13SSL-N memory upgrade

SKU CH-EFJ9-WH0QY

A 256 GB DDR5 registered ECC kit with two 128 GB modules running at 6400 MT/s, CL52 and 1.1 V, validated for the Supermicro H13SSL-N 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
  • 256 GB total capacity from two 128 GB modules for dense server workloads
  • DDR5 6400 speed with CL52 latency delivers rated bandwidth out of the box
  • Registered ECC RDIMM design offloads the memory controller and corrects single-bit errors
  • 1 V operation at 2Rx4 rank matches the motherboard's electrical spec exactly
  • Validated for Supermicro H13SSL-N with 288-pin RDIMM form factor and population rules

Exact-match DDR5 256 GB kit for Supermicro H13SSL-N

This 256 GB kit contains two 128 GB registered ECC RDIMMs built to the DDR5 6400 standard. It is intended for administrators upgrading a Supermicro H13SSL-N motherboard that requires registered memory. The modules operate at 1.10 V with a CAS latency of 52.

Capacity and headroom at 6400 MT/s

The dual-rank 2Rx4 organisation lets each DIMM present 128 GB, giving the board 256 GB total when both slots are populated. Registered buffering allows the memory controller to drive every slot at the rated 6400 MT/s without signal degradation. Systems needing more than 256 GB will require a motherboard with additional DIMM slots.

Build quality and daily implications

Major-brand Samsung, Micron or Hynix ICs are used without heat spreaders, relying on server chassis airflow for cooling. The 288-pin RDIMM form factor fits only registered DIMM slots; it will not work in unbuffered or SODIMM sockets. Verify the board's population rules before installation to ensure correct slot order.

How it compares

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

Price $9,354.99
Pricier than about 86% 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 $36.54 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 numberMR51200-724K2
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 rank2Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsSupermicro
In the box
Included items256 GB 2 × 128 GB DDR5 6400 MHz PC5-51200 2Rx4 1.1 V 288-PIN ECC RDIMM KIT

Questions about this item

Will this 2Rx4 DDR5 6400 RDIMM kit run at full speed alongside existing 1Rx8 modules in a Supermicro H13SSL-N?

The kit is 2Rx4 Registered ECC at 1.10 V CL52; matching rank, voltage and timing is required for full-speed operation, so check the motherboard manual for approved population rules before mixing ranks.

How can I confirm the 256 GB kit is detected at DDR5 6400 with ECC active after installation?

Enter the BIOS and verify total memory shows 256 GB, speed reads 6400 MT/s, and ECC status is enabled; then run a memory diagnostic that reports corrected errors to prove ECC is functioning.

Does the MR51200-724K2 box include only the two 128 GB RDIMMs or are heat spreaders and cables also supplied?

The package contains the two 128 GB 288-pin DDR5 RDIMM modules only; no heat spreaders, cables or additional accessories are included.

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