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Two green DDR4 SODIMM modules with gold contacts and black chips

OWC

OWC 64GB (2x32GB) DDR4 2666 ECC SODIMM Kit RS1221+ RS1221RP+

SKU CH-MNE3-DWHXW

64 GB DDR4 2666 ECC SODIMM kit (2 × 32 GB) validated for Synology RS1221+ and RS1221RP+ NAS systems

  • Total capacity64 GB (2 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 64 GB kit doubles NAS capacity for heavy workloads
  • ECC protection guards data integrity in Synology RS1221+ and RS1221RP+
  • DDR4 2666 speed matches system spec for stable operation
  • 2 V modules run cooler and draw less power
  • 260-pin SODIMM form factor fits the NAS memory slots directly

Capacity and fit

This kit provides 64GB of DDR4 ECC memory in two 32GB SODIMM modules rated at 2666MHz with CL19 latency. It is built for Synology DiskStation RS1221+ and RS1221RP+ units that accept 260-pin unbuffered ECC SO-DIMMs running at 1.2V.

Who this suits and who it does not

The modules suit administrators who need to expand the RS1221+ or RS1221RP+ to the full 64GB capacity using validated ECC parts. Buyers who need a different capacity, non-ECC memory, DIMM form factor, or compatibility with other platforms should look elsewhere.

Behaviour under sustained load

The memory operates at the JEDEC-standard 2666MHz speed and 1.2V voltage continuously, with ECC correcting single-bit errors during long file transfers, backup jobs or virtual-machine workloads. Backward compatibility lets the kit run at 2400MHz or 2133MHz if the system requires a lower speed.

How it compares

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

Price $454.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (2 × 32 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $7.11 per GB
Cheaper than about 57% 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 number2C6D42R8064P
Total capacity64 GB (2 × 32 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 DiskStation RS1221+
Synology DiskStation RS1221RP+

Questions about this item

Does this kit need a Synology DiskStation RS1221+ or RS1221RP+ to operate?

Yes, the 64GB DDR4 2666 ECC SODIMM kit is validated for Synology DiskStation RS1221+ and RS1221RP+ systems.

Will the 2666MHz modules run with existing 2400MHz or 2133MHz memory in the same NAS?

The modules are backwards compatible with 2400MHz and 2133MHz speeds, so they will clock down to match slower installed memory.

How can I confirm the 64GB ECC kit is recognised and running at CL19 after installation?

Check the Synology DSM Resource Monitor or the system memory report; it should show 64GB total capacity with ECC active at CL19 latency.

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