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Two green circuit boards with gold edge connectors and black memory chips

OWC

OWC 16GB (2x8GB) DDR4 2666MHz ECC SODIMM memory upgrade for Synology RS1221+ / RS1221RP+

SKU CH-MPEC-X1QYN

16 GB DDR4 2666 MHz ECC SODIMM kit validated for Synology RS1221+ and RS1221RP+ 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)

  • 16 GB kit doubles NAS capacity for heavier workloads
  • ECC protection detects and corrects single-bit errors automatically
  • 2666 MHz DDR4 speed matches Synology RS1221+ specifications
  • 2 V low-voltage modules reduce power draw and heat
  • JEDEC and RoHS compliant for warranty-safe installation

Targeted NAS Upgrade

This 16GB kit contains two 8GB DDR4 ECC SODIMM modules built for the Synology RS1221+ and RS1221RP+ rackmount NAS. It adds error-correcting memory to systems that run continuous file, backup or virtualization workloads.

Sustained Workload Behaviour

JEDEC-standard 2666MHz CL19 timing and 1.2V operation keep latency predictable during long backup windows or container migrations. ECC detects and corrects single-bit errors without halting services.

Thermal And Power Profile

Low-voltage unbuffered modules without heat spreaders draw minimal power inside the chassis. Passive cooling in the rackmount enclosure keeps temperatures stable and fan noise unchanged.

How it compares

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

Price $114.99
Cheaper than about 66% 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 $7.19 per GB
Cheaper than about 56% 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 RackstationRS1221+
Synology RackstationRS1221RP+

Other versions of this model

5 more in the same range

Questions about this item

How much power does the 1.2 V DDR4 2666 MHz kit draw when the Synology RS1221+ runs continuously?

Each module operates at 1.2 V, the standard DDR4 voltage, so total power stays low during 24/7 NAS operation and no extra cooling is required.

What must the Synology RS1221RP+ already have inside for these two 8 GB sticks to work?

The rackstation needs two free 260-pin SODIMM slots and a CPU that supports DDR4 ECC unbuffered memory; the kit then installs without tools.

Will the 2666 MHz CL19 modules down-clock reliably if my RS1221+ currently runs 2400 MHz memory?

Yes, the sticks are backward compatible with 2400 MHz and 2133 MHz, so they will run at the lower speed without errors.

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