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Two green DDR4 ECC SODIMM sticks, black chips, no heat spreader

OWC

OWC 16GB (2x8GB) DDR4 2666 ECC SODIMM for Synology DS1621+ DS1621xs+

SKU CH-CDHZ-N5V12

A 16 GB DDR4 2666 ECC SODIMM kit validated for Synology DS1621+ and DS1621xs+ NAS systems

  • Total capacity16 GB (2 × 8 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank1Rx8

Capacity 16GB (2 x 8GB)

  • ECC protection prevents data errors with 16GB DDR4 2666 CL19 modules
  • Dual 8GB kit expands NAS capacity for heavy multitasking workloads
  • 2V low voltage reduces power draw in DS1621+ and DS1621xs+
  • Unbuffered SODIMM design enables straightforward DIY installation in 260-pin slots
  • JEDEC compliant memory runs at 2133 or 2400MHz when needed

Synology DS1621+ compatible DDR4 ECC kit

This 16GB kit contains two 8GB DDR4 2666 SODIMM modules built for the Synology DiskStation DS1621+ and DS1621xs+. Each stick runs at 1.2V with CL19 latency and includes on-die ECC for data integrity. The 260-pin unbuffered design matches the factory memory slots in these NAS units.

NAS owners who need ECC memory

The kit suits administrators expanding a DS1621+ or DS1621xs+ beyond the stock capacity while keeping error correction active. Systems that require registered DIMMs, non-ECC modules, or a different pin count cannot use this memory. Builders working on desktop PCs or laptops without ECC support should look elsewhere.

2666MHz CL19 DDR4 SODIMM specification

The modules operate at DDR4 2666 (PC4-21300) with a CAS latency of 19 and 1.2V voltage. JEDEC compliance allows backward compatibility with 2400MHz and 2133MHz bus speeds. This speed and latency combination determines whether the NAS will accept the upgrade without timing conflicts.

How it compares

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

Price $119.99
Cheaper than about 65% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (2 × 8 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $7.50 per GB
Cheaper than about 54% of the 20,941 comparable items (median $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 number2C6D41R8016P
Total capacity16 GB (2 × 8 GB)
Product type260-Pin DDR4 ECC SODIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology DiskStationDS1621+
Synology DiskStationDS1621xs+

Other versions of this model

5 more in the same range

Questions about this item

How do I install the 260-pin SODIMM modules in my DS1621+ and what step is often missed?

Power off the NAS, unplug it, open the chassis cover, insert each module at an angle until the gold contacts disappear, then press down firmly until both side clips click — the step most people miss is pressing hard enough to engage both clips.

Will the ECC SODIMMs need any firmware updates or replacement after a certain period?

No firmware updates are required for the memory itself; the modules are passive components with no moving parts and are rated for continuous operation at 1.2V, so they do not have a scheduled replacement interval.

What is the first limit reached when the DS1621xs+ runs sustained workloads with this CL19 2666MHz kit?

The memory controller caps the data rate at 2666 MT/s, so sustained throughput is limited by the DDR4-2666 CL19 timing rather than thermals or voltage.

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