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Four green DDR4 ECC UDIMM sticks in static bags

OWC

OWC 64GB (4x16GB) DDR4 2666 ECC UDIMM RS3618xs memory upgrade

SKU CH-KKSD-E02Q5

A 64 GB kit of four 16 GB DDR4 2666 ECC UDIMM modules validated for the Synology RS3618xs

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8

Capacity 64GB (4 x 16GB)

  • 64 GB total capacity from four 16 GB modules
  • ECC protection guards data integrity in Synology RS3618xs
  • JEDEC-standard DDR4 2666 MHz CL19 at 1.2 V
  • Unbuffered 288-pin UDIMM fits the RS3618xs memory slots
  • Backward compatible with 2133 MHz and 2400 MHz systems

Synology RS3618xs 64GB DDR4 ECC kit

This OWC upgrade delivers 64GB of DDR4 2666 ECC UDIMM memory across four 16GB modules. It is built for the Synology RackStation RS3618xs and meets JEDEC and RoHS standards. The kit installs without tools and carries a limited lifetime warranty with free technical support.

NAS administrators needing ECC reliability

The unbuffered ECC design suits the RS3618xs workloads that demand data integrity and 1.2V operation. Builders targeting consumer platforms without ECC support or systems requiring registered DIMMs should select a different module type.

2666MHz CL19 DDR4 2666 speed rating

Each 288-pin DIMM runs at PC4-21300 with CL19 latency and 2Rx8 organisation. The modules are backward compatible with 2133MHz and 2400MHz buses, so the kit will clock down automatically if the host requires a lower frequency.

How it compares

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

Price $460.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $7.20 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 number2E6D42R8064S
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR4 ECC UDIMM
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 RackstationRS3618xs

Other versions of this model

5 more in the same range

Questions about this item

Should I pick the 64 GB kit or a smaller capacity for my RS3618xs?

The kit supplies 64 GB total across four 16 GB modules and matches the Synology RackStation RS3618xs qualified configuration.

What does the 2666 MHz rating actually deliver inside the NAS?

The modules run at DDR4 2666 with CL19 latency and 1.2 V, giving the rated PC4-21300 bandwidth when installed in the RS3618xs.

Does the DDR4 2666 ECC UDIMM interface limit speed or capacity in this system?

The 288-pin unbuffered ECC DIMMs operate at 2666 MHz and will also run at 2400 MHz or 2133 MHz if the platform requires it.

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