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Green 288-pin DDR4 ECC UDIMM module with black chips, no heat spreader

OWC

OWC 16GB DDR4 2666MHz ECC UDIMM 2Rx8 CL19 1.2V memory upgrade

SKU CH-CWP2-H934K

Adds 16 GB of DDR4 2666 MHz ECC UDIMM memory to a Synology RS2818RP+ NAS with CL19 latency and 1.2 V operation

  • Total capacity16 GB (1 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 16GB single module expands NAS capacity
  • ECC UDIMM protects data integrity in Synology RS2818RP+
  • DDR4 2666MHz CL19 matches system memory speed
  • 2V JEDEC standard voltage keeps power draw low
  • 288-pin unbuffered design fits straight into compatible slots

16 GB DDR4 ECC UDIMM for Synology RS2818RP+

This 16 GB DDR4 2666 MHz ECC unbuffered UDIMM is built for the Synology RackStation RS2818RP+ and other compatible NAS, workstation or server platforms. It adds error-correcting memory capacity to systems that require 288-pin DDR4 modules running at 1.2 V. Buyers who need non-ECC consumer DIMMs or higher-frequency kits should look elsewhere.

JEDEC-standard module with backward speed support

The stick meets JEDEC and RoHS specs, so it operates at the rated 2666 MHz CL19 timing and also runs stably in slots limited to 2133 MHz or 2400 MHz. No extra software, drivers or heat spreader are included; the upgrade is purely the memory module itself. Systems that demand registered or load-reduced DIMMs will not accept this unbuffered design.

Tool-free slot insertion with standard DDR4 keying

Installation consists of aligning the 288-pin edge connector with the motherboard slot and pressing until the retention clips click. The only common issues are mixing ECC with non-ECC modules or exceeding the platform’s maximum supported capacity per slot, which this single 16 GB module avoids when used as directed.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $125.99
Cheaper than about 65% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (1 × 16 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $7.87 per GB
Typical for this category: the median of 20,941 items is $8.19 per GB.

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameOWC
Part number2E6D42R816 GB
Total capacity16 GB (1 × 16 GB)
Product type288-Pin DDR4 ECC UDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology RackstationRS2818RP+

Questions about this item

Will the 2Rx8 ECC UDIMM need any firmware updates or periodic replacement in the Synology RS2818RP+?

The module is a JEDEC-standard 288-pin DDR4 2666MHz CL19 1.2V ECC unbuffered DIMM validated for the RS2818RP+. No firmware updates or scheduled replacement are required; it runs for the system's lifetime.

What limit appears first when the RS2818RP+ runs this 16GB stick at full load continuously?

The memory operates at its rated 2666MHz CL19 1.2V specification. The first limit encountered is the module's own speed and latency ceiling, not a thermal or power throttle, because it has no heat spreader and draws standard DDR4 power.

How much heat and noise does the 1.2V DDR4 2666MHz module add when the NAS runs all day?

The stick runs at standard 1.2V DDR4 voltage with no heat spreader, so it adds minimal heat and zero noise. System fan speed stays governed by the RS2818RP+ chassis, not by the memory module itself.

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