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

NEMIX RAM

NEMIX RAM 256GB (2x128GB) DDR5 6400MHz CL52 ECC RDIMM Server Memory Kit for SuperMicro AS-8126GS-NB3RT

SKU CH-S9PZ-2505X

A 256 GB DDR5 registered ECC memory kit with two 128 GB modules at 6400 MHz CL52, built for the SuperMicro AS-8126GS-NB3RT server

  • Total capacity256 GB (2 × 128 GB)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL52
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • Memory rank2Rx4
  • 256 GB total capacity from two 128 GB modules
  • DDR5 6400 MHz speed with CL52 latency
  • ECC registered design protects data integrity
  • 1 V operation reduces power draw
  • Qualified for SuperMicro AS-8126GS-NB3RT server

Capacity and Compatibility

This NEMIX RAM kit provides 256GB of DDR5 server memory in a matched pair of 128GB modules. It is built specifically for the SuperMicro GPU A+ Server AS-8126GS-NB3RT and operates at 6400MHz with CL52 latency.

Build and Connections

Each module uses a 288-pin RDIMM form factor with registered buffering and ECC for data integrity. The 2Rx4 dual-rank layout runs at 1.1V without a heat spreader, fitting directly into standard DDR5 RDIMM slots on the target platform.

Deciding Specification

The 6400MHz DDR5 speed combined with ECC RDIMM registration determines whether this kit matches the motherboard's qualified memory list. Systems requiring a different speed, unbuffered DIMMs or non-ECC memory cannot use this kit.

How it compares

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

Price $9,058.99
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 $35.39 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
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL52
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank2Rx4
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

What data rate does the DDR5 6400MHz interface cap at for this kit?

The DDR5 6400MHz interface caps at 6400 MT/s, which is the rated PC5-51200 speed for these modules.

What physical slot and pin count do these 288-pin RDIMMs need to fit in the SuperMicro AS-8126GS-NB3RT?

They require standard DDR5 RDIMM slots with 288 pins; the server board must provide registered DIMM sockets that accept 288-pin modules.

How are the two 128GB modules installed, and which step is often missed?

Insert each module into the correct DDR5 RDIMM slot per the motherboard manual, press down until the retention clips lock, then verify the system detects the full 256GB in BIOS — skipping the slot-order check is the common mistake.

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