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Four green DDR4 RDIMM sticks, no heat spreaders

NEMIX RAM

NEMIX RAM 64GB (4x16GB) DDR4 2666 ECC RDIMM Synology memory upgrade

SKU CH-564M-C41YK

A 64GB kit of four 16GB DDR4 2666 ECC registered DIMMs validated for Synology NAS systems

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 64GB kit expands NAS capacity for heavy workloads
  • Four 16GB modules fill four slots in matched set
  • DDR4 2666 PC4-21300 speed matches Synology D4RD-2666-16G spec
  • ECC registered RDIMM protects data integrity in server tasks
  • 2V CL19 1Rx4 288-pin design drops in without voltage change

Synology-compatible DDR4 2666 ECC RDIMM kit

This 64 GB kit contains four 16 GB DDR4 2666 modules built to the PC4-21300 standard. Each stick is a 288-pin registered DIMM with ECC and a 1Rx4 organisation. The memory runs at 1.2 V with CL19 latency and is validated for Synology NAS systems that require registered ECC DRAM.

Tool-free installation with standard DIMM slots

Modules seat in the NAS motherboard's 288-pin DDR4 sockets without screws or cables. The registered buffer adds electrical load, so the system must support RDIMMs; unbuffered UDIMMs will not work in the same slots. Handle the modules by the edges to avoid contaminating the gold contacts.

Verify NAS model accepts 1Rx4 registered ECC

Check the Synology hardware compatibility list to confirm the chassis supports 64 GB total capacity and 1Rx4 registered modules. Some models limit rank count or maximum density per slot. Ensure the firmware is current before adding memory, and do not mix these sticks with unbuffered or non-ECC modules.

How it compares

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

Price $382.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $5.98 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 numberMR21300-614K4
Total capacity64 GB (4 × 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 items64 GB (4 × 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 can I confirm the 64GB kit is running at 2666 MT/s with CL19 after installation?

Enter the Synology DSM interface and open the hardware information section; it will report the memory speed as DDR4 2666 and the CAS latency as CL19 for each of the four modules.

The box lists four 16GB RDIMMs — are any cables, brackets or tools required to fit them?

No extra parts are needed; the package contains only the four 288-pin DDR4 RDIMM modules, and they install directly into the NAS memory slots using the release levers already on the motherboard.

My NAS has four slots — should I choose the 64GB (4×16GB) kit or a smaller capacity?

If all four slots are free, the 64GB kit fills them with matched 1Rx4 registered ECC modules at 1.20 V, giving the maximum supported capacity in a single validated kit.

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