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Green circuit board with black memory chips, gold edge connector, no heat spreader

NEMIX RAM

NEMIX RAM 16GB DDR4 2666 ECC UDIMM CL19 2Rx8 1.2V 288-pin Synology RS3621xs+ memory upgrade

SKU CH-5B1T-B2S1T

16 GB DDR4 2666 ECC UDIMM module with CL19 latency for Synology RS3621xs+ NAS expansion

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • ECC protection guards data integrity in Synology RS3621xs+ NAS
  • 16 GB module expands capacity for demanding workloads
  • DDR4 2666 speed matches system specification for stable operation
  • Unbuffered 288-pin UDIMM fits directly into available memory slots
  • Low 1.2 V voltage reduces power draw and heat output

Synology RS3621xs+ memory upgrade

This 16 GB DDR4 2666 ECC UDIMM module is built for the Synology RackStation RS3621xs+ NAS. It adds capacity with error-correcting memory to protect data integrity in a mission-critical storage server. The unbuffered design fits the platform's standard DIMM slots.

DDR4 2666 interface limits

The module runs at DDR4 2666 (PC4-21300) with CL19 latency at 1.20 V. Speed is fixed by the JEDEC standard for this generation; the memory controller will not negotiate a higher data rate. ECC operation requires a compatible platform that enables the feature in firmware.

Check your NAS before ordering

Verify that your RS3621xs+ has a free 288-pin UDIMM slot and that the current firmware supports 2Rx8 ECC modules. Confirm the maximum supported capacity per slot in the official specifications. Ensure the system is powered down and anti-static precautions are taken during installation.

How it compares

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

Price $122.99
Cheaper than about 65% 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 $7.69 per GB
Typical for this category: the median of 20,941 items is $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 Unbuffered UDIMM
Part numberME21300-628K1
Total capacity16 GB
Product type288-Pin DDR4 ECC UDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items16 GB (1 × 16 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 288-PIN ECC Unbuffered UDIMM

Questions about this item

Should I pick the 16 GB 2Rx8 module or a different capacity for the RS3621xs+?

The 16 GB 2Rx8 stick is a single-module kit; add identical modules to reach the capacity your workload needs.

What does the 2666 MHz rating deliver inside the RS3621xs+?

The module runs at DDR4 2666 (PC4-21300) with CL19 latency, giving the NAS its rated memory bandwidth.

Does the 288-pin ECC UDIMM interface limit speed or features on this NAS?

The 288-pin DDR4 ECC unbuffered UDIMM fits the RS3621xs+ slots and operates at the specified 2666 MHz.

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