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A single black 288-pin DDR4 UDIMM module, 16GB, no heat spreader

OWC

OWC 16GB DDR4 2666 ECC Unbuffered UDIMM desktop RAM

SKU CH-YNQX-3S6QR

A 16 GB DDR4 2666 MHz ECC unbuffered UDIMM with CL19 latency and 1.2 V operation for desktop, workstation, server and NAS upgrades

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Recommended forWorkstations, Servers, and NAS Systems

Capacity 16GB

  • 16GB capacity expands multitasking headroom for workstations and NAS
  • DDR4 2666MHz PC4-21300 CL19 delivers responsive data throughput
  • ECC unbuffered design protects data integrity in critical workloads
  • 2V operation reduces power draw and heat output
  • JEDEC and RoHS compliant for warranty-safe system upgrades

ECC Unbuffered UDIMM for Workstations and NAS

This 16GB DDR4 2666 module adds error-correcting memory to desktop PCs, workstations, servers and NAS systems. The single 2Rx8 DIMM runs at PC4-21300 with CL19 latency and 1.2V operation. It is designed as a direct upgrade for compatible OEM platforms including Synology D4EC-2666-16G and D4EU01-16G.

Verify DDR4 Slot Count and ECC Support

Before ordering, confirm your motherboard or NAS chassis accepts 288-pin DDR4 UDIMMs and enables ECC functionality in BIOS. The module is backward compatible with 2133MHz and 2400MHz bus speeds, so it will clock down if the platform requires a lower frequency. Ensure an empty slot is available for the single-stick installation.

Low-Voltage Operation Without Heat Spreader

At 1.2V the module draws minimal power and runs cool enough to operate without a heat spreader in typical chassis airflow. JEDEC-standard construction and RoHS compliance ensure stable thermals during continuous workloads in servers or NAS units. Acoustic impact is negligible because the DIMM has no moving parts.

How it compares

Measured against everything we stock in Desktop RAM, at today’s prices. Recalculated every night.

Price $117.99
Pricier than about 55% of the 3,647 comparable items (median $90.99).
Total capacity 16 GB
Typical for this category: the median of 3,251 items is 16 GB.
Price per GB $7.37 per GB
Pricier than about 54% of the 3,251 comparable items (median $6.75 per GB).

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Specifications

Product
Brand nameOWC
Part number2E6D42R816 GB
Total capacity16 GB
Product colorBlack
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Recommended forWorkstations, Servers, and NAS Systems
More details
LED lightingNone

Other versions of this model

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Questions about this item

Does the module arrive as a single 16GB stick or a kit of multiple sticks?

The upgrade consists of one 16GB DDR4 2666 PC4-21300 CL19 2Rx8 288-pin 1.2V ECC unbuffered DIMM.

Should I pick this 16GB 2666MHz CL19 module or a different capacity for my NAS?

This part delivers 16GB at DDR4 2666 with CL19 timing; select it when your NAS or workstation requires exactly that capacity and speed.

What does the 2666MHz rating actually deliver once the DIMM is installed in a compatible desktop or NAS?

The module runs at 2666 MT/s with CL19 latency at 1.2V, and will also operate at 2400 or 2133 MT/s if the platform requires a lower speed.

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