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Green bare circuit board with gold edge connectors and black memory chips, no heat spreader

OWC

OWC 16GB DDR4 2666 ECC UDIMM CL19 1.2V 2Rx8 FS2500

SKU CH-MNXF-7PRRZ

16 GB DDR4 ECC UDIMM running at 2666 MHz with CL19 latency for Synology FlashStation FS2500

  • Total capacity16 GB (1 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 16 GB capacity expands NAS storage for large datasets
  • ECC protection detects and corrects memory errors automatically
  • DDR4 2666 MHz speed matches FS2500 specifications
  • 2 V operation reduces power draw and heat
  • 288-pin UDIMM form factor fits Synology FlashStation FS2500 slots

OWC 16GB DDR4 ECC UDIMM for Synology FS2500

This 16GB DDR4 2666 ECC unbuffered UDIMM is built specifically for the Synology FlashStation FS2500. It adds 16GB of error-correcting memory to the NAS, helping maintain data integrity during intensive workloads. The module suits administrators who need a validated upgrade for this exact platform.

Fits FS2500 DDR4 slots with 288-pin layout

The stick plugs into a standard 288-pin DDR4 DIMM slot on the FS2500 motherboard. It runs at 1.2V and carries a 2Rx8 organisation, matching the system's native electrical and timing requirements. Because it is unbuffered ECC, it works without registered memory support. Backward compatibility with 2133MHz and 2400MHz buses allows the module to down-clock if the platform demands it.

Single-module upgrade with lifetime warranty

The package contains one 16GB DIMM, so capacity scales in 16GB increments per populated slot. OWC validates every module in-house and backs it with a limited lifetime warranty plus free technical support. JEDEC and RoHS compliance ensures the upgrade keeps the original system warranty intact. No heat spreader is fitted, preserving clearance in dense NAS chassis.

How it compares

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

Price $128.99
Cheaper than about 64% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (1 × 16 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $8.06 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 number2E6D42R816 GB
Total capacity16 GB (1 × 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 FlashstationFS2500

Questions about this item

How does the 2Rx8 dual-rank layout affect sustained throughput on the FS2500?

The dual-rank 2Rx8 organisation lets the memory controller interleave accesses across both ranks, which keeps bandwidth higher during long workloads than a single-rank module of the same capacity.

What thermal headroom should I expect from the 1.2 V unbuffered DIMM running 24/7 in a rack?

At 1.2 V with no heat spreader the module runs cool enough for continuous operation in a Synology FS2500 chassis; airflow from the system fans is sufficient — no extra cooling is required.

Which existing DIMM slots must be free on the FlashStation FS2500 to install this 288-pin module?

The FS2500 uses standard 288-pin DDR4 UDIMM slots; you need one vacant slot that supports ECC unbuffered memory at 2666 MT/s (PC4-21300) to add this 16 GB stick.

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