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Green rectangular SODIMM module with gold edge connector and black chips, no heat spreader

OWC

OWC 4GB DDR4 2666 CL19 1Rx8 260-pin 1.2V Non-ECC SODIMM memory upgrade

SKU CH-C251-MRNJE

Adds 4 GB of DDR4 2666 memory to compatible Synology NAS units with CL19 timing and 1.2 V operation

  • Total capacity4 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank1Rx8
  • Boost responsiveness with 4GB DDR4 2666 CL19 memory
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • Easy DIY installation with OWC video guidance
  • Backward compatible with 2400MHz and 2133MHz systems
  • Tested to meet OEM specs for Synology DiskStation NAS

Synology DiskStation NAS Upgrade

This OWC 4 GB DDR4 2666 SODIMM is built for Synology DiskStation DS220+, DS420+, DS423+, DS720+ and DS920+ units. The 260-pin module installs in the single user-accessible slot to increase memory capacity for file sharing, virtualization and Docker workloads. It runs at 1.2 V with CL19 latency and carries JEDEC and RoHS compliance.

Suitable for listed DiskStation models only

Owners of the supported Synology NAS models can use this module to add 4 GB of RAM without voiding the system warranty. Systems outside this compatibility list, or builds that require ECC, registered memory or capacities above 4 GB per slot, will need a different module.

DDR4 2666 CL19 1Rx8 specification

The decisive spec is the DDR4 2666 CL19 1Rx8 unbuffered SODIMM profile; the NAS firmware only accepts this exact timing and rank configuration. Matching these parameters ensures the module posts correctly and operates at the rated 2666 MT/s speed.

How it compares

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

Price $27.99
Cheaper than about 86% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $7.00 per GB
Cheaper than about 57% of the 20,941 comparable items (median $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 number2S6D41R804 GB
Total capacity4 GB
Product type260-Pin DDR4 Non-ECC SODIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology DiskStation DS220+
Synology DiskStation DS420+
Synology DiskStation DS423+
Synology DiskStation DS720+
Synology DiskStation DS920+

Other versions of this model

5 more in the same range

Questions about this item

Which Synology DiskStation models accept this 4 GB DDR4 2666 CL19 SODIMM?

It is validated for the DS220+, DS420+, DS423+, DS720+ and DS920+ units.

Will the module run reliably if the NAS currently uses 2400 MHz memory?

Yes, the stick is backwards compatible with 2400 MHz and 2133 MHz systems and will operate at the lower speed.

How can I confirm the upgrade is recognised after installation?

Open DSM, go to Control Panel → Info Center → System and verify the total memory now shows the additional 4 GB.

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