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Two green DDR4 RDIMM modules with black chips, no heat spreaders

NEMIX RAM

NEMIX RAM 64GB (2x32GB) DDR4 2666 ECC RDIMM memory upgrade for Synology SA6400

SKU CH-SSCP-VJ8BR

64 GB DDR4-2666 ECC registered DIMM kit (2 × 32 GB) validated for Synology SA6400 NAS

  • Capacity64GB (2 x 32GB)
  • SpeedDDR4 2666 (PC4 21300)
  • ECCYes
  • Buffered/RegisteredRegistered
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • Voltage1.20V
  • 64 GB total capacity from two 32 GB modules
  • DDR4 2666 MHz speed rated at PC4-21300 bandwidth
  • ECC registered RDIMM design detects and corrects data errors
  • 20 V low-voltage operation reduces power draw
  • Validated for Synology SA6400 NAS compatibility

Synology SA6400 memory kit

This 64GB kit contains two 32GB DDR4 2666 ECC registered DIMMs built for the Synology SA6400 NAS. Each module runs at 1.20V with CL19 latency and a 2Rx4 organisation. The registered design adds a buffer that stabilises heavy multi-threaded workloads.

DDR4 2666 registered ECC limits

The DDR4 2666 interface tops out at 21300 MB/s theoretical bandwidth, so throughput cannot exceed that ceiling. ECC and register logic introduce a small latency penalty versus unbuffered modules. Systems that require unbuffered memory or faster speeds will not accept these DIMMs.

2Rx4 registered ECC decides fit

The 2Rx4 registered ECC layout is the single specification that determines whether the SA6400 will POST and run without errors. Buyers whose platforms demand unbuffered non-ECC modules or a different rank structure cannot use this kit.

Highlights

  • 64 GB total capacity from two 32 GB modules
  • DDR4 2666 MHz speed rated at PC4-21300 bandwidth
  • ECC registered RDIMM design detects and corrects data errors
  • 20 V low-voltage operation reduces power draw
  • Validated for Synology SA6400 NAS compatibility

Specifications

BrandNEMIX RAM
SeriesSynology Compatible Series NAS Memory
ModelSynology DDR4 2666MHZ ECC RDIMM Registered Server Memory
Part NumberMR21300-324K2
Capacity64GB (2 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 Content64GB (2X32GB) DDR4 2666MHZ PC4-21300 2Rx4 1.2V CL19 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Should I choose the 64GB kit or buy single 32GB modules for the Synology SA6400?

The 64GB kit provides two matched 32GB modules tested together for dual-channel operation on the Synology SA6400.

What does the 2666MHz rating deliver in the SA6400?

DDR4 2666 (PC4-21300) runs at 2666MHz with CL19 latency, giving the bandwidth the SA6400 memory controller expects for registered ECC workloads.

Does the 288-pin RDIMM interface limit capacity or speed on this NAS?

The 288-pin DDR4 RDIMM form factor is the standard for the SA6400; the registered buffer and ECC allow the 2Rx4 32GB density at 2666MHz within the platform's memory architecture.

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