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Sixteen green DDR4 RDIMM modules in anti-static tray

NEMIX RAM

NEMIX RAM Synology Compatible 512GB (16x32GB) DDR4 2666 ECC RDIMM memory upgrade

SKU CH-HBBT-AEDJF

512 GB DDR4 2666 ECC registered memory kit with sixteen 32 GB modules for Synology FS6400 NAS

  • Total capacity512 GB (16 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 512 GB total capacity from 16 modules of 32 GB each
  • DDR4 2666 speed rated at PC4-21300 for high throughput
  • ECC registered design detects and corrects data errors
  • 2 V operation with CL19 latency for efficient performance
  • Validated compatible with Synology FS6400 NAS systems

Synology FS6400 memory kit

This 512 GB kit contains sixteen 32 GB DDR4 2666 registered ECC DIMMs validated for the Synology FS6400 NAS. Each module runs at 1.2 V with CL19 latency and a 2Rx4 organisation. The registered design adds a buffer that helps the memory controller maintain signal integrity across all sixteen slots.

Suited for capacity-bound NAS workloads

Administrators who need the maximum supported memory for virtualisation, large-scale file services or database caching on the FS6400 will use every slot. Builders working with consumer motherboards, non-ECC platforms or systems limited to fewer DIMM slots cannot use this registered kit.

Build integration

The 288-pin RDIMMs install directly into the FS6400 memory slots without additional cabling or cooling hardware. ECC and register buffering free the CPU from single-bit error correction overhead, while the low 1.2 V operating voltage reduces power draw across the full 512 GB population.

How it compares

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

Price $2,751.99
Pricier than about 72% of the 21,161 comparable items (median $397.99).
Total capacity 512 GB (16 × 32 GB)
Higher than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $5.37 per GB
Cheaper than about 72% 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 numberMR21300-324K16
Total capacity512 GB (16 × 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 items512 GB (16 × 32 GB) DDR4 2666 MHz PC4-21300 2Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory

Questions about this item

My Synology FS6400 NAS has 16 DIMM slots — will this 16-module kit fill every slot?

Yes, the kit contains 16 modules of 32 GB each, matching the 16-slot population of the FS6400 for a full 512 GB configuration.

If I keep some existing DDR4 ECC RDIMMs in the FS6400, will the new CL19 2666 MHz modules operate at the same speed and latency?

All installed modules run at the lowest common speed and highest latency; the new CL19 2666 MHz RDIMMs will down-clock to match any slower or higher-latency modules already present.

After populating all 16 slots, how can I confirm the NAS sees the full 512 GB running at 2666 MHz with ECC active?

In DSM open Control Panel > Info Center > System; the Memory section should show 512 GB total, DDR4 2666, ECC enabled, and no errors reported.

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