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Green DDR4 ECC UDIMM circuit board with gold contacts and black chips

OWC

OWC 16GB DDR4 2666MHz ECC UDIMM CL19 1.2V 2Rx8 288-pin memory upgrade

SKU CH-0XHJ-STABP

A 16GB DDR4 2666MHz ECC UDIMM module for Synology RackStation R3617RPxs and RSS3617xs+ systems

  • Total capacity16 GB (1 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 16 GB capacity expands NAS memory for heavier workloads
  • DDR4 2666 MHz CL19 delivers fast data rates with low latency
  • ECC unbuffered design protects data integrity in critical operations
  • 2 V operation reduces power draw and heat output
  • Compatible with Synology RackStation R3617RPxs and RSS3617xs+ systems

Compatible NAS Memory Upgrade

This 16GB DDR4 ECC UDIMM is built for Synology RackStation R3617RPxs and RSS3617xs+ systems. It delivers 2666MHz speed with CL19 latency at 1.2V. The module targets administrators who need to expand capacity in these specific NAS units. It is not for buyers who want non-ECC memory or modules for consumer desktop platforms.

DDR4 2666MHz Interface Limits

The memory runs at PC4-21300 2666MHz CL19 and supports backward compatibility with 2133MHz and 2400MHz bus speeds. JEDEC-standard signalling defines the electrical and timing boundaries for this unbuffered 288-pin format. Systems that require registered DIMMs or higher voltage operation cannot use this module.

Tool-Free DIMM Installation

Installing the stick is a straightforward DIY task: open the chassis, align the notch, and press until the latches click. The 2Rx8 organisation and lack of a heat spreader keep the profile low for tight NAS bays. Common issues include failing to seat the module fully or mixing ranks in channels that require matched pairs.

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 (1 × 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.

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 nameOWC
Part number2E6D42R816 GB
Total capacity16 GB (1 × 16 GB)
Product type288-Pin DDR4 ECC UDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology RackstationR3617RPxs
Synology RackstationRSS3617xs+

Questions about this item

Should I choose the 16GB module or add multiple sticks for my Synology RackStation?

This is a single 16GB DDR4 2666MHz ECC UDIMM. Add one module per available slot on the R3617RPxs or RSS3617xs+ to reach the total capacity your NAS supports.

What does the 2666MHz speed deliver inside a Synology RackStation R3617RPxs?

The module runs at 2666MHz CL19 at 1.2V. In the R3617RPxs it operates at the system's native DDR4 2666 bus, giving the full PC4-21300 bandwidth for file serving and virtualization workloads.

Is the 288-pin ECC UDIMM interface compatible with the R3617RPxs memory slots?

Yes. The 288-pin DDR4 ECC UDIMM matches the R3617RPxs and RSS3617xs+ DIMM slots exactly. It also down-clocks to 2400MHz or 2133MHz if the system requires a lower speed.

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