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Eight green DDR4 RDIMM sticks in anti-static tray

NEMIX RAM

NEMIX RAM 128GB (8x16GB) DDR4 2666 ECC RDIMM Synology Compatible memory upgrade

SKU CH-GZB5-WHHJ3

Eight 16 GB DDR4 2666 ECC RDIMM modules totalling 128 GB, CL19 at 1.2 V, built for Synology NAS compatibility

  • Total capacity128 GB (8 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 128 GB total capacity across eight 16 GB modules
  • ECC registered design detects and corrects single-bit errors
  • DDR4-2666 speed with CL19 timing for responsive NAS operation
  • 2 V low-voltage modules reduce power draw and heat
  • Validated for Synology D4RD-2666-16G compatibility

Synology NAS 128GB DDR4 Kit

This 128GB kit contains eight 16GB DDR4 2666 registered ECC modules built for Synology NAS systems. It targets administrators who need maximum supported capacity for virtualisation, heavy file services or database workloads on compatible Synology platforms.

Thermals and Power at 1.2V

Each module runs at 1.20V with no heat spreader, relying on the NAS chassis airflow for cooling. Registered buffering and ECC add minimal latency while keeping power draw low during sustained 2666 MT/s operation.

What the Kit Changes

The eight-module population fills every slot on supported Synology models, eliminating mixed-capacity configurations and delivering the full 128GB in a single validated kit. No additional software or accessories are included.

How it compares

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

Price $867.99
Pricier than about 59% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (8 × 16 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $6.78 per GB
Cheaper than about 59% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameNEMIX RAM
Product lineSynology Compatible Series NAS Memory
Model nameSynology DDR4 2666 MHz ECC RDIMM Registered Server Memory
Part numberMR21300-614K8
Total capacity128 GB (8 × 16 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 rank1Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items128 GB (8 × 16 GB) DDR4 2666 MHz PC4-21300 1Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

How do I install the 288-pin DDR4 RDIMM modules in my Synology NAS, and what step is often missed?

Power off the NAS, open the chassis, align each module's notch with the slot key, press firmly until the side clips click, then verify all eight 16GB sticks are recognised in DSM before closing the case.

Will the ECC registered memory need any firmware updates or component swaps over its service life?

The modules themselves require no firmware updates or scheduled part replacements; ECC error correction runs in hardware and the registered buffer is passive, so the kit operates maintenance-free unless a stick fails.

At what point does the CL19 latency at 2666 MT/s become the bottleneck during sustained workloads?

Under continuous heavy traffic the CAS 19 timing at 2666 MT/s limits random-access throughput before the 1.2 V power envelope or the registered buffer saturates.

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