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Two black DDR4 UDIMM sticks without heat spreaders

OWC

OWC 16GB (2x8GB) DDR4 2666MHz ECC Unbuffered UDIMM desktop RAM

SKU CH-78BP-AGHDS

A 16GB dual-channel DDR4 2666MHz ECC unbuffered UDIMM kit with CL19 timing and 1.2V operation for workstations, servers and NAS systems

  • Total capacity16 GB (2 × 8 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Kit configurationDual Channel Kit

Capacity 16GB (2 x 8GB)

  • ECC protection guards data integrity in critical workloads
  • 16 GB dual-channel kit boosts multitasking headroom
  • 2666 MHz DDR4 speed matches OEM specifications
  • 2 V operation keeps power draw low
  • JEDEC and RoHS compliant for warranty-safe upgrades

16GB Dual-Channel DDR4 ECC Kit

This 16 GB kit contains two 8 GB DDR4 2666 MHz modules that run at CL19 and 1.2 V. It is an unbuffered ECC UDIMM designed for desktop PCs, workstations, servers and NAS systems such as Synology RackStation, FlashStation and NVR DVA units.

ECC Unbuffered for Data Integrity

The modules provide error-correcting code without registered buffering, a combination required by many NAS and server platforms. JEDEC-standard PC4-21300 timing ensures the memory operates at the rated 2666 MHz speed with CL19 latency.

Low-Voltage Operation with Backward Compatibility

At 1.2 V the kit draws minimal power and generates little heat, aided by the absence of a heat spreader. It is also compatible with 2133 MHz and 2400 MHz systems, allowing installation in older platforms without configuration changes.

How it compares

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

Price $104.99
Typical for this category: the median of 3,647 items is $90.99.
Total capacity 16 GB (2 × 8 GB)
Typical for this category: the median of 3,251 items is 16 GB.
Price per GB $6.56 per GB
Typical for this category: the median of 3,251 items is $6.75 per GB.

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Specifications

Product
Brand nameOWC
Part number2E6D41R8016P
Total capacity16 GB (2 × 8 GB)
Product colorBlack
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Recommended forWorkstations, Servers, and NAS Systems
More details
LED lightingNone

Other versions of this model

5 more in the same range

Questions about this item

Will this kit fit a Synology NAS that uses the D4EC-2666-8G or D4EU01-8G modules?

Yes — the kit is built to match those Synology part numbers and uses the same 288-pin ECC unbuffered DDR4 2666MHz CL19 1.2V specification.

My motherboard only supports 2133MHz or 2400MHz DDR4 — will the modules still work?

They are backward compatible and will run at 2133MHz or 2400MHz if the system cannot operate at 2666MHz.

Does the kit require a heat spreader or active cooling for continuous NAS operation?

No heat spreader is included; the modules run at standard 1.2V JEDEC voltage and are designed for typical workstation, server and NAS workloads without extra cooling.

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