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Green rectangular circuit board with gold edge connectors and black memory chips, no heat spreader

NEMIX RAM

NEMIX RAM 16GB DDR4 2666MHz ECC RDIMM CL19 1.2V 288-pin Synology memory upgrade

SKU CH-QCXK-WM5W0

16 GB DDR4 2666 MHz ECC registered DIMM with CL19 latency and 1.2 V operation for Synology NAS

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 16 GB capacity expands NAS workload headroom
  • ECC registered design protects data integrity under load
  • DDR4 2666 MHz speed matches Synology D4RD-2666-16G spec
  • 2 V operation keeps power draw low
  • 288-pin RDIMM form factor fits supported Synology bays

Synology NAS Memory Upgrade

This 16GB DDR4 ECC RDIMM is built for Synology NAS systems that require registered memory with error correction. It targets administrators who need to expand capacity on compatible platforms without changing voltage or speed settings.

DDR4 2666 Registered ECC Limits

The module runs at 2666MHz with CL19 latency at 1.2V, matching the PC4-21300 standard for registered DIMMs. Registered buffering adds a clock cycle, so unbuffered consumer boards will not post with this stick installed.

Installing In A Synology Chassis

The 288-pin RDIMM seats like standard DDR4 but the key notch position differs from UDIMM slots, so it only fits registered sockets. Common issues arise when the NAS firmware has not been updated to recognise 1Rx4 density or when mixed ranks prevent the system from booting.

How it compares

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

Price $97.99
Cheaper than about 68% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $6.12 per GB
Cheaper than about 64% 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 numberMR21300-614K1
Total capacity16 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 items16 GB (1 × 16 GB) DDR4 2666 MHz PC4-21300 1Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory

Questions about this item

Should I choose the 16GB DDR4 2666MHz CL19 module or a lower-capacity stick?

The 16GB 1Rx4 registered ECC DIMM delivers maximum capacity per slot for Synology NAS systems that support DDR4 2666 registered memory.

What does the 2666MHz rating mean once the module is installed in my Synology NAS?

The module runs at DDR4 2666 (PC4-21300) with CL19 latency at 1.2V, providing the rated bandwidth and error-correction your NAS firmware expects.

Is the 288-pin DDR4 RDIMM interface compatible with standard desktop DIMM slots?

No, the 288-pin registered ECC RDIMM fits only server or NAS motherboards that accept registered DDR4 memory; it will not work in unbuffered desktop slots.

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