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Green rectangular circuit board with gold edge connector and black memory chips, SODIMM form factor

OWC

OWC 16GB DDR4 2666MHz ECC SODIMM CL19 2Rx8 1.2V 260-pin memory upgrade

SKU CH-D2RP-D2P9S

A 16 GB DDR4 ECC SODIMM running at 2666 MHz with CL19 latency for Synology NAS and micro-servers

  • Capacity16GB
  • Type260-Pin DDR4 ECC SODIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.20V
  • ECCYes

Capacity 16GB

  • 16 GB DDR4 2666 MHz CL19 ECC SODIMM boosts NAS responsiveness
  • JEDEC compliant PC4-21300 module ensures warranty-safe Synology upgrade
  • Single 2Rx8 rank 1.20 V stick installs easily in 260-pin slots
  • Backward compatible with 2400 MHz and 2133 MHz systems
  • ECC protection guards data integrity in micro servers and POS devices

Synology-Ready ECC SODIMM

This 16GB DDR4 2666MHz ECC SODIMM is built for Synology NAS units and other micro servers that require error-correcting memory. The unbuffered 2Rx8 module runs at 1.2V and fits the standard 260-pin SO-DIMM slot found in compatible Synology systems such as the D4ECSO-2666-16G and D4ES01-16G.

Replaces Slower DDR4 Modules

It upgrades from 2133MHz or 2400MHz DDR4 ECC SODIMMs while maintaining full backward compatibility. The jump is worth it when your Synology NAS shows memory pressure during heavy file serving, virtualization or database workloads that benefit from the higher 2666MHz data rate and CL19 latency.

Straightforward Laptop-Style Install

Installation follows the usual SO-DIMM procedure: power down the NAS, open the memory compartment, align the notch on the 260-pin module, insert at an angle and press down until the clips lock. What usually goes wrong is mixing ECC with non-ECC modules or populating slots in the wrong order for the specific Synology model; consult the system manual for the approved configuration.

Highlights

  • 16 GB DDR4 2666 MHz CL19 ECC SODIMM boosts NAS responsiveness
  • JEDEC compliant PC4-21300 module ensures warranty-safe Synology upgrade
  • Single 2Rx8 rank 1.20 V stick installs easily in 260-pin slots
  • Backward compatible with 2400 MHz and 2133 MHz systems
  • ECC protection guards data integrity in micro servers and POS devices

Specifications

BrandOWC
Part Number2C6D42R816GB
Capacity16GB
Type260-Pin DDR4 ECC SODIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.20V
ECCYes
Buffered/RegisteredUnbuffered
Rank2Rx8
Heat SpreaderNo
Compatible SystemSynology

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Questions about this item

Does the 260-pin SODIMM fit the memory slot in my Synology NAS?

Yes — the module uses the standard 260-pin DDR4 SODIMM form factor that Synology D4ECSO-2666-16G and D4ES01-16G systems require.

What is the correct way to seat the module so the ECC function works?

Align the notch with the slot key, press the module in at a slight angle until the gold contacts disappear, then push down firmly until both side clips click — the most common mistake is stopping before the clips engage.

Will the ECC chips on this 16 GB module ever need replacement?

The memory itself has no moving parts and is rated for the life of the system; replacement is only needed if you add capacity or a diagnostic tool reports correctable errors that exceed the platform threshold.

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