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Four green DDR4 UDIMM sticks with gold contacts and black chips

OWC

OWC 64GB (4x16GB) DDR4 2666MHz ECC UDIMM CL19 1.2V 2Rx8 288-pin memory upgrade

SKU CH-0ZWC-CRA5S

64 GB kit of four 16 GB DDR4 2666 MHz ECC UDIMM modules for Synology RS2818RP+ NAS

  • 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)

  • 64GB total capacity expands NAS multitasking headroom
  • ECC protection guards data integrity in Synology RS2818RP+
  • 2666MHz DDR4 speed matches system spec for stable operation
  • CL19 latency at 1.2V keeps power draw low
  • Four 16GB unbuffered UDIMMs install without tools

Synology RS2818RP+ memory kit

This 64GB kit contains four 16GB DDR4 2666MHz ECC UDIMM modules built for the Synology RackStation RS2818RP+. Each stick runs at 1.2V with CL19 latency and a 2Rx8 organisation. The unbuffered design fits the 288-pin slots in this NAS platform. It targets administrators who need the maximum supported capacity for virtualisation or heavy file workloads.

Upgrade from lower-capacity or non-ECC DIMMs

The kit replaces smaller or non-ECC memory that limits multitasking and data integrity on the RS2818RP+. Moving to 64GB lets the system hold more VMs and larger caches without swapping. The ECC function corrects single-bit errors that standard modules would miss. Backward compatibility with 2133MHz and 2400MHz buses means the kit also works if the chassis originally shipped with slower DIMMs.

Tool-less DIMM installation

Installation requires opening the chassis, seating each module in the 288-pin slots until the latches click, then closing the cover. No heat spreaders are present, so clearance is not an issue. The main risk is mixing these ECC UDIMMs with registered or non-ECC sticks, which prevents the system from posting. Populating all four channels with identical modules avoids timing mismatches.

How it compares

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

Price $507.99
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 $7.94 per GB
Typical for this category: the median of 20,941 items is $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 RackstationRS2818RP+

Other versions of this model

5 more in the same range

Questions about this item

Will the 288-pin DDR4 UDIMM modules fit the four DIMM slots in my Synology RackStation RS2818RP+?

Yes, each 16 GB module uses the standard 288-pin DDR4 UDIMM form factor that matches the four slots in the RS2818RP+.

What is the correct installation sequence for the four 2Rx8 modules, and what step do people often miss?

Power down, open the chassis, insert each module at a 30-degree angle until the side clips click, then verify the system reports 64 GB at 2666 MHz.

Do these ECC UDIMMs require any firmware updates or periodic replacement after installation?

No firmware update is needed; the JEDEC-compliant 1.2 V modules run maintenance-free for the life of the NAS.

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