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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

  • Total capacity64 GB (2 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 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.

How it compares

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

Price $387.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (2 × 32 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $6.06 per GB
Cheaper than about 65% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineSynology Compatible Series NAS Memory
Model nameSynology DDR4 2666 MHz ECC RDIMM Registered Server Memory
Part numberMR21300-324K2
Total capacity64 GB (2 × 32 GB)
Product type288-Pin DDR4 RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank2Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items64 GB (2 × 32 GB) DDR4 2666 MHz PC4-21300 2Rx4 1.2 V 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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