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Four green DDR4 RDIMM modules in anti-static tray

NEMIX RAM

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

SKU CH-S55Y-V6YGS

A 128 GB DDR4 ECC registered kit of four 32 GB modules running at 2666 MHz CL19 and 1.20 V for Synology SA3600 NAS

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 128 GB total capacity from four 32 GB modules
  • ECC registered design protects data integrity in critical workloads
  • DDR4 2666 speed with CL19 latency for responsive server operation
  • 2 V low voltage reduces power draw and heat
  • Validated for Synology SA3600 NAS compatibility

Synology NAS 128 GB kit

This 128 GB kit contains four 32 GB DDR4 2666 registered DIMMs built for the Synology SA3600 NAS. The modules add ECC error correction and registered signalling to protect data integrity in a multi-user storage server.

Registered ECC advantage

Registered buffering reduces electrical load on the memory controller, allowing all four slots to be populated at the rated 2666 MT/s speed. ECC detects and corrects single-bit errors, preventing silent data corruption during heavy file serving or backup workloads.

288-pin RDIMM form factor

Each stick uses the standard 288-pin DDR4 RDIMM layout and operates at 1.2 V without a heat spreader, so it fits the SA3600's memory slots without clearance issues. Buyers who need non-ECC unbuffered DIMMs or a different capacity per module 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 $755.99
Pricier than about 57% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $5.91 per GB
Cheaper than about 66% 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 numberMR21300-324K4
Total capacity128 GB (4 × 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 items128 GB (4 × 32 GB) DDR4 2666 MHz PC4-21300 2Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Will the 288-pin RDIMM modules need any firmware updates or periodic re-seating after installation?

No firmware updates are required for these modules; once seated in the Synology SA3600 they stay locked in place and do not need re-seating.

What limit appears first when the kit runs at 2666 MT/s continuously under full load?

The registered 2Rx4 design and 1.20 V operation keep thermal output low, so the memory controller's bandwidth ceiling is reached before any module throttling occurs.

How much heat and fan noise does the 128 GB kit add when the NAS runs all day?

With no heat spreaders and a standard 1.2 V DDR4 voltage, the four modules add minimal warmth and no audible noise beyond the chassis fans already present.

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