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OWC

OWC 8GB DDR4 2666 CL19 ECC Unbuffered DIMM desktop RAM

SKU CH-SF4H-3JQGJ

8GB DDR4 2666 CL19 ECC unbuffered DIMM for desktops, workstations, servers and NAS systems with 1.2V operation and backward compatibility to 2133 and 2400 speeds

  • Capacity8GB
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes
  • Buffered/RegisteredUnbuffered
  • ECC protection safeguards data integrity in critical workloads
  • DDR4 2666 speed delivers responsive multitasking performance
  • 2V operation reduces power draw and heat output
  • Backward compatible with 2133 and 2400MHz systems
  • 288-pin unbuffered DIMM fits standard desktop and NAS slots

DDR4 ECC DIMM for workstations and NAS

This 8 GB DDR4 module runs at 2666 MT/s with CL19 latency and operates at 1.2 V. It is an unbuffered ECC DIMM designed for desktop PCs, workstations, servers and NAS systems. The 288-pin form factor fits standard DDR4 slots. It serves as a direct replacement for the Synology D4EU02-8G part.

Thermals and power in normal use

The module has no heat spreader and draws power at the standard 1.2 V JEDEC voltage. ECC operation adds error correction without increasing voltage or thermal load beyond typical DDR4 limits. Passive cooling from case airflow is sufficient for normal workloads. Backward compatibility with 2133 and 2400 MT/s systems allows stable operation at lower speeds.

JEDEC compliance and warranty-safe upgrade

Full JEDEC and RoHS compliance ensures the module meets OEM specifications for a warranty-safe installation. OWC tests every module in-house to verify reliability before shipping. The limited lifetime warranty includes free technical support from Other World Computing. An advanced replacement program is available to minimise downtime if a fault occurs.

Highlights

  • ECC protection safeguards data integrity in critical workloads
  • DDR4 2666 speed delivers responsive multitasking performance
  • 2V operation reduces power draw and heat output
  • Backward compatible with 2133 and 2400MHz systems
  • 288-pin unbuffered DIMM fits standard desktop and NAS slots

Specifications

BrandOWC
Part Number2E6D41R808GB
Capacity8GB
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredUnbuffered
Heat SpreaderNo
Recommend UseWorkstations, Servers, and NAS Systems
LED ColorNone

Questions about this item

Will this module work in a Synology NAS that originally shipped with the D4EU02-8G stick?

Yes, the module is built to match the Synology D4EU02-8G specification and carries the same 8GB capacity, DDR4 2666 speed, CL19 latency, 1.2V voltage and ECC unbuffered design.

My motherboard only supports 2133MHz or 2400MHz DDR4 — can I still use this 2666MHz kit?

The module is backward compatible with 2133MHz and 2400MHz systems and will automatically run at the highest speed the board allows.

Does this DIMM require a heat spreader or extra cooling in a compact workstation?

No heat spreader is included; the module operates at standard 1.2V JEDEC voltage and is designed for normal airflow in workstations, servers and NAS enclosures.

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