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Four green DDR4 RDIMM modules in anti-static tray

NEMIX RAM

NEMIX RAM 128GB (4x32GB) DDR4 2666 ECC RDIMM Synology SA6400 memory upgrade

SKU CH-D311-HX59G

A 128GB kit of four 32GB DDR4-2666 ECC registered DIMMs validated for the Synology SA6400 NAS

  • Capacity128GB (4 x 32GB)
  • SpeedDDR4 2666 (PC4 21300)
  • ECCYes
  • Buffered/RegisteredRegistered
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • Voltage1.20V
  • 128 GB total capacity across four 32 GB modules
  • ECC registered design detects and corrects data errors
  • DDR4 2666 speed with CL19 latency for responsive throughput
  • 2 V operation reduces power draw under load
  • Validated for Synology SA6400 NAS compatibility

Synology SA6400 memory upgrade

This 128 GB kit contains four 32 GB DDR4 2666 ECC RDIMM modules built for the Synology SA6400 NAS. It targets administrators who need to expand capacity for virtualisation, database workloads or multi-user file services. The registered design and error-correcting code protect data integrity in continuous operation.

Installation and common issues

Modules install in the SA6400 slots without tools, but the system requires all four slots to be populated with identical registered DIMMs for full operation. Mixing unbuffered memory or leaving a slot empty will prevent the NAS from booting. Verify the firmware is current before adding the kit.

Sustained-load behaviour

ECC detection and correction runs continuously during heavy multi-threaded workloads such as backup deduplication or container hosting. The 1.2 V registered modules maintain stable throughput without the voltage drift seen in consumer DIMMs. Thermal throttling is not triggered under normal chassis airflow.

Highlights

  • 128 GB total capacity across four 32 GB modules
  • ECC registered design detects and corrects data errors
  • DDR4 2666 speed with CL19 latency for responsive throughput
  • 2 V operation reduces power draw under load
  • Validated for Synology SA6400 NAS compatibility

Specifications

BrandNEMIX RAM
SeriesSynology Compatible Series NAS Memory
ModelSynology DDR4 2666MHZ ECC RDIMM Registered Server Memory
Part NumberMR21300-324K4
Capacity128GB (4 x 32GB)
SpeedDDR4 2666 (PC4 21300)
ECCYes
Buffered/RegisteredRegistered
ChipsetMajor OEM Samsung, Micron, Hynix
Voltage1.20V
Compatible SystemSynology
CAS LatencyCL19
Heat SpreaderNo
Type288-Pin DDR4 RDIMM
Rank2Rx4
FeaturesDDR4 ECC Registered RDIMM Server Motherboard Compatible
Package Content128GB (4X32GB) DDR4 2666MHZ PC4-21300 2Rx4 1.2V CL19 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

How can I confirm the 128GB kit is running at 2666 MT/s with ECC after installation?

Enter the Synology SA6400 DSM interface, open Resource Monitor and check the Memory section — it will show 128 GB total, 2666 MHz speed and ECC status as active.

What comes in the box and is anything else required for the SA6400?

The box contains four 32 GB DDR4 2666 ECC RDIMM modules (part MR21300-324K4); no extra parts or tools are needed for the SA6400 slots.

Why choose the 128GB (4×32GB) CL19 1.20V kit over a smaller capacity?

The SA6400 supports up to 128 GB across its four DIMM slots; this kit fills all slots with matched 2Rx4 registered modules for maximum capacity and stability.

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