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Green 288-pin DDR4 ECC UDIMM module with black chips, no heat spreader

OWC

OWC 16GB DDR4 2666 ECC UDIMM 1Rx8 Synology RS1619xs+ RS2818RP+

SKU CH-X9WS-2K14C

16 GB DDR4-2666 ECC UDIMM module for Synology RS1619xs+ and RS2818RP+ NAS systems

  • Total capacity16 GB (1 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 16GB DDR4 2666MHz ECC UDIMM boosts Synology RS1619xs+ and RS2818RP+ capacity
  • JEDEC-standard PC4-21300 CL19 module ensures warranty-safe, error-correcting operation
  • 2V unbuffered 2Rx8 design runs cool without a heat spreader
  • Backward compatible with 2133MHz and 2400MHz systems for flexible deployment
  • Single 288-pin DIMM installs easily for immediate multitasking headroom

OWC 16GB DDR4 ECC UDIMM for Synology NAS

This OWC module provides 16GB of DDR4 2666MHz ECC unbuffered memory in a single 288-pin DIMM. It is validated for Synology RackStation RS1619xs+ and RS2818RP+ systems. The CL19 2Rx8 stick runs at 1.2V and meets JEDEC standards.

Who should use this and who should not

NAS owners expanding RS1619xs+ or RS2818RP+ units with supported ECC RAM will benefit. Builders needing non-ECC memory, registered DIMMs, speeds above 2666MHz, or capacities beyond 16GB per slot must select different modules.

The deciding specification: ECC unbuffered DDR4 2666

This stick is ECC unbuffered DDR4 at 2666MHz (PC4-21300). If your Synology model requires registered memory, non-ECC memory, or a different DDR generation, this part will not function correctly.

How it compares

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

Price $123.99
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 $7.75 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 RackstationRS1619xs+
Synology RackstationRS2818RP+

Questions about this item

Will this 16GB DDR4 2666 ECC UDIMM run alongside my existing 2133MHz or 2400MHz modules in the RS1619xs+?

Yes, the module is backward compatible with 2133MHz and 2400MHz speeds and will downclock to match the slowest installed DIMM.

How can I verify the 2Rx8 ECC UDIMM is recognised correctly after installing it in my RS2818RP+?

Check the Synology DSM Info Center; it will list the new 16GB module at 2666MHz with ECC active and show total system memory increased by 16GB.

Does the 288-pin 1.2V DIMM ship alone or with any tools or extra cables for the RackStation upgrade?

Only the single 16GB DDR4 2666 CL19 ECC UDIMM is included; no tools, cables or additional hardware are supplied.

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