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Four green DDR4 ECC UDIMM sticks in a row

OWC

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

SKU CH-P3H2-TBZ6Q

A 64 GB DDR4 ECC UDIMM kit of four 16 GB modules at 2666 MHz CL19, validated for Synology RackStation RS1619xs+ and RS2818RP+

  • 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 from four 16GB modules
  • DDR4 2666MHz speed with CL19 latency for responsive NAS operation
  • ECC unbuffered design protects data integrity in Synology RackStations
  • 2V low voltage reduces power draw and heat in 24/7 systems
  • JEDEC and RoHS compliant for warranty-safe upgrades in RS1619xs+ and RS2818RP+

OWC 64GB DDR4 ECC kit for Synology RackStation

This 64GB kit contains four 16GB DDR4 2666 ECC UDIMM modules validated for Synology RackStation RS1619xs+ and RS2818RP+. It targets NAS administrators who need error-correcting memory to protect data integrity in multi-user file serving or virtualization workloads.

Sustained-load behaviour with ECC at 2666MHz

The modules run at 1.2V with CL19 latency and 2Rx8 organisation, maintaining JEDEC-standard timing during continuous operation. ECC detects and corrects single-bit errors that can accumulate under long-running services, while the unbuffered design keeps latency low for typical NAS workloads.

Tool-free DIMM installation in compatible bays

Each 288-pin UDIMM slots into the RackStation memory bays without cables or brackets; the kit is backward compatible with 2133MHz and 2400MHz operation if the system requires it. Builders who need registered DIMMs or a different capacity per module cannot use this kit.

How it compares

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

Price $480.99
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 $7.52 per GB
Cheaper than about 54% 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 RackstationRS1619xs+
Synology RackstationRS2818RP+

Other versions of this model

5 more in the same range

Questions about this item

How much power does the 1.2V DDR4 2666 kit draw when the NAS runs continuously?

Each module operates at 1.2 volts, the standard DDR4 voltage, so total power draw stays low even with all four slots populated 24/7.

What must the Synology unit already have to accept this 4×16 GB upgrade?

The RS1619xs+ or RS2818RP+ needs four free 288-pin UDIMM slots and a BIOS that supports ECC unbuffered DDR4 at 2666 MT/s.

Will the CL19 2666 sticks run stably alongside any 2133 or 2400 MHz modules I keep installed?

Yes — the kit is backward-compatible with 2133 and 2400 speeds, so mixed populations will run at the lowest common frequency.

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