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Green rectangular circuit board with gold edge contacts and black memory chips, no heat spreader

OWC

OWC 8GB DDR4 2666 CL19 ECC UDIMM memory upgrade

SKU CH-EVFG-C2X15

8GB DDR4 2666 ECC UDIMM with CL19 latency and 1.2V operation, validated for QNAP TS-h1283XU-RP, TS-h1683XU-RP, TS-h2483XU-RP, TS-h686 and TS-h886 NAS systems

  • Capacity8GB
  • Type288-Pin DDR4 ECC UDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes
  • 8GB capacity adds memory headroom for demanding NAS workloads
  • DDR4 2666 CL19 timing delivers responsive data access speeds
  • ECC protection detects and corrects single-bit errors automatically
  • 2V low voltage reduces power draw and heat output
  • Validated for QNAP TS-h1283XU-RP TS-h1683XU-RP TS-h2483XU-RP TS-h686 TS-h886

OWC 8GB DDR4 ECC UDIMM for QNAP NAS

This 8GB DDR4 2666 CL19 ECC unbuffered module is built for QNAP TS-h1283XU-RP, TS-h1683XU-RP, TS-h2483XU-RP, TS-h686 and TS-h886 systems. It adds capacity while maintaining data integrity through error-correcting code. The single-rank 1Rx8 design fits standard 288-pin DIMM slots. It replaces QNAP part number RAM-8GDR4ECT0-UD-2666 directly.

JEDEC-standard 1.2V DDR4 module without heat

The module operates at 1.2 volts and meets JEDEC PC4-21300 specifications for broad compatibility. It is backward compatible with 2133MHz and 2400MHz bus speeds. The bare circuit board allows installation in tight NAS chassis where tall heat spreaders would block adjacent slots or airflow. No extra power connectors or tools are required for the upgrade.

Verify your NAS model

Confirm the exact model number matches the supported list above. Check how many memory slots your unit has populated and the maximum capacity per slot allowed by the firmware. Ensure the system accepts unbuffered ECC UDIMMs rather than registered or load-reduced variants. This module is not suitable for platforms that require registered memory or non-ECC consumer DIMMs.

Highlights

  • 8GB capacity adds memory headroom for demanding NAS workloads
  • DDR4 2666 CL19 timing delivers responsive data access speeds
  • ECC protection detects and corrects single-bit errors automatically
  • 2V low voltage reduces power draw and heat output
  • Validated for QNAP TS-h1283XU-RP TS-h1683XU-RP TS-h2483XU-RP TS-h686 TS-h886

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 SystemQNAP TS-h1283XU-RP
QNAP TS-h1683XU-RP
QNAP TS-h2483XU-RP
QNAP TS-h686
QNAP TS-h886

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Questions about this item

Does the DDR4 2666 PC4-21300 module run at 2666 MHz in a QNAP TS-h1283XU-RP or will the system clock it down?

The module is rated for 2666 MHz PC4-21300 CL19 at 1.2 V; the listed QNAP models accept this speed natively, so it will operate at the full 2666 MHz data rate.

Will the 288-pin ECC unbuffered DIMM fit the memory slots in a TS-h686 or TS-h886 without a heat spreader?

Yes, the stick uses the standard 288-pin UDIMM form factor with no heat spreader, matching the slot keying and height clearance of the TS-h686 and TS-h886 NAS units.

What is the correct way to seat this 1Rx8 ECC UDIMM so the QNAP NAS recognises the full 8 GB?

Power off the NAS, open the chassis, align the notch on the 288-pin edge connector with the slot key, press firmly until both retention clips click, then power on and verify 8 GB in the system information.

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