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OWC

OWC 16GB DDR4 2666MHz CL19 ECC SODIMM for Synology RS1221+ RS1221RP+ memory upgrade

SKU CH-A31M-K7NTR

Adds 16 GB of DDR4 ECC memory at 2666 MHz CL19 to Synology RS1221+ and RS1221RP+ NAS units

  • Total capacity16 GB (1 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 16 GB capacity expands NAS memory headroom for demanding workloads
  • ECC protection detects and corrects single-bit errors to safeguard data integrity
  • DDR4 2666 MHz CL19 timing matches Synology RS1221+ and RS1221RP+ specifications
  • 2 V low-voltage operation reduces power draw and heat in rackmount enclosures
  • 260-pin SODIMM form factor enables straightforward DIY installation in compatible bays

System-Specific ECC SODIMM for Synology RackStation

This 16GB DDR4 2666MHz CL19 module is built for the Synology RackStation RS1221+ and RS1221RP+. It targets administrators who need to expand memory capacity in these specific NAS units. The ECC unbuffered design protects data integrity for always-on services. It arrives as a single 260-pin stick ready for installation.

Fits the RS1221+ and RS1221RP+ memory slots directly

The module plugs into the standard 260-pin SODIMM sockets inside the compatible RackStation chassis. No heat spreader is fitted, so it clears tight server layouts without interference. JEDEC-standard 1.2V operation matches the platform voltage exactly. Backward compatibility with 2400MHz and 2133MHz buses lets it work if the system clocks down.

16GB capacity extends multitasking headroom

The 2Rx8 organisation delivers a full 16GB in one slot, leaving the second slot free for a future matching module. ECC correction handles single-bit errors that can corrupt ZFS pools or VM images. At CL19 latency the stick feeds the CPU steadily, though heavy transcode farms or dense virtualisation clusters will still want more total memory than a single module provides.

How it compares

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

Price $117.99
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 $7.37 per GB
Cheaper than about 55% 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 number2C6D42R816 GB
Total capacity16 GB (1 × 16 GB)
Product type260-Pin DDR4 ECC SODIMM
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 RackstationRS1221+
Synology RackstationRS1221RP+

Questions about this item

Will the 2666MHz CL19 latency become a bottleneck when the NAS runs heavy workloads continuously?

The module runs at JEDEC-standard 2666MHz with CL19 timings; sustained throughput is limited by that rated speed and latency.

How much heat does the 1.2V ECC SODIMM generate during all-day operation in a Synology RS1221+?

At 1.2V with no heat spreader, the stick produces minimal heat and relies on the chassis airflow of the RS1221+ or RS1221RP+.

Does my Synology RackStation need an open 260-pin DDR4 slot and ECC support to use this 16GB stick?

Yes — the RS1221+ and RS1221RP+ both provide 260-pin DDR4 SODIMM slots with ECC capability, which this module requires.

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