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Green circuit board with gold contacts and black memory chips

OWC

OWC 8GB DDR4 2666 ECC UDIMM CL19 1.2V SA3400D

SKU CH-A3M7-G9K21

An 8 GB DDR4 ECC UDIMM running at 2666 MHz CL19, validated for Synology NAS models including the SA3400D, DS725+, DS925+, DS1825+ and DS1825xs+ with JEDEC-standard 1.2 V operation

  • Capacity8GB
  • Type288-Pin DDR4 ECC UDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 8GB

  • 8GB
  • 16GB

Struck-through versions exist but are not stocked here.

  • ECC protection guards data integrity in Synology SA3400D
  • 2666 MHz DDR4 speed matches PC4-21300 system bus
  • 2 V operation keeps power draw low
  • Single 8 GB 1Rx8 module installs in 288-pin slot
  • JEDEC and RoHS compliant for warranty-safe upgrade

OWC 8GB DDR4 2666 ECC UDIMM

This module is an 8GB DDR4 2666 ECC unbuffered DIMM built for Synology NAS models including the SA3400D, DS1825+, DS1825xs+, DS725+ and DS925+. It runs at 1.2V with CL19 latency and a 1Rx8 rank configuration. The 288-pin design fits standard DDR4 slots in compatible systems.

Suits Synology NAS owners needing ECC

It suits administrators upgrading the listed Synology DiskStation units where ECC unbuffered memory is required. Buyers with platforms that demand registered or load-reduced DIMMs should look elsewhere. Systems that only accept non-ECC modules cannot use this part. The single 8GB capacity may not fill every slot in larger configurations.

288-pin DDR4 ECC unbuffered form factor

The decisive specification is the 288-pin DDR4 ECC unbuffered form factor combined with 2666MHz speed and CL19 timing. This exact combination determines whether the module seats correctly and operates without errors in the target Synology NAS. Verify the motherboard accepts unbuffered ECC before ordering.

Highlights

  • ECC protection guards data integrity in Synology SA3400D
  • 2666 MHz DDR4 speed matches PC4-21300 system bus
  • 2 V operation keeps power draw low
  • Single 8 GB 1Rx8 module installs in 288-pin slot
  • JEDEC and RoHS compliant for warranty-safe upgrade

Specifications

BrandOWC
Part Number2E6D41R808GB
Capacity8GB
Type288-Pin DDR4 ECC UDIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredUnbuffered
Rank1Rx8
Heat SpreaderNo
Compatible SystemSynology NAS SA3400D
Synology DiskStation DS1825+
Synology DiskStation DS1825xs+
Synology DiskStation DS725+
Synology DiskStation DS925+

Other versions of this model

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Questions about this item

Should I pick the 8GB module or add more than one for the SA3400D?

Each module is 8GB; the SA3400D accepts multiple 288-pin DDR4 ECC UDIMMs, so add as many as the chassis slots allow.

What does the 2666MHz rating actually deliver inside a Synology NAS?

The module runs at 2666MHz CL19 at 1.2V, and will down-clock to 2400MHz or 2133MHz if the NAS memory controller requires it.

Does the PC4-21300 label limit which Synology models I can use it with?

PC4-21300 is the JEDEC bandwidth rating for DDR4-2666; the module is validated for SA3400D, DS1825+, DS1825xs+, DS725+ and DS925+.

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