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Two green DDR3 ECC UDIMM sticks, 240-pin, no heat spreaders

OWC

OWC 16GB (2x8GB) DDR3 1600 CL11 ECC UDIMM 1.5V Synology memory upgrade

SKU CH-YMNF-TH1M8

16 GB dual-channel DDR3-1600 ECC UDIMM kit validated for Synology RC18015xs+, RS10613xs+, RS18016xs+, RS3413xs+ and RS3614xs+ NAS systems

  • Total capacity16 GB (2 × 8 GB)
  • Rated speedDDR3 1600 (PC3 12800)
  • CAS latencyCL11
  • Rated voltage1.5 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8

Capacity 16GB (2 x 8GB)

  • ECC protection guards data integrity in Synology NAS
  • 1600 MHz DDR3 speed matches PC3-12800 system requirements
  • 16 GB kit (2×8 GB) expands capacity for heavy workloads
  • 5 V JEDEC voltage ensures warranty-safe operation
  • 240-pin UDIMM form factor fits listed Synology models directly

Synology NAS ECC UDIMM kit

This OWC kit provides 16 GB of DDR3 1600 ECC unbuffered memory in two 8 GB modules. It targets owners of Synology RC18015xs+, RS10613xs+, RS18016xs+, RS3413xs+ and RS3614xs+ units who need to expand system memory for heavier workloads. The modules run at CL11 latency and 1.5 V, matching the JEDEC PC3-12800 standard for these platforms.

240-pin DDR3 form factor

Each stick uses the standard 240-pin UDIMM layout with 2Rx8 organisation and no heat spreader, so it fits the factory DIMM slots without clearance issues. ECC support adds single-bit error correction for data integrity in always-on NAS environments. Unbuffered design keeps latency low for the memory controllers used in the listed Synology models.

Replaces Synology RAMEC1600DDR3-8GBX2

The kit serves as a direct replacement for the OEM part number, doubling the factory 8 GB per slot configuration. The upgrade is worthwhile when virtual machines, Docker containers or large file caches push the original memory limit. It is not suited for systems that require registered DIMMs, higher speeds than DDR3 1600 or voltages other than 1.5 V.

How it compares

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

Price $62.99
Cheaper than about 74% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (2 × 8 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $3.94 per GB
Cheaper than about 85% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number1E6D32R8016P
Total capacity16 GB (2 × 8 GB)
Product type240-Pin DDR3 ECC UDIMM
Performance
Rated speedDDR3 1600 (PC3 12800)
Memory
CAS latencyCL11
ECC supportYes
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.5 V
Compatibility
Compatible systemsSynology NAS RC18015xs+
Synology NAS RS10613xs+
Synology NAS RS18016xs+
Synology NAS RS3413xs+
Synology NAS RS3614xs+

Other versions of this model

5 more in the same range

Questions about this item

What speed does the DDR3 1600 PC3-12800 interface run at in these Synology NAS models?

The modules operate at DDR3 1600 (PC3-12800) with CL11 latency, so the bus caps at 1600 MT/s in the compatible RC18015xs+, RS10613xs+, RS18016xs+, RS3413xs+ and RS3614xs+ units.

What physical slot and form factor do the two 8 GB sticks require?

Each stick is a 240-pin DDR3 ECC UDIMM measuring the standard DIMM length; the kit needs two adjacent unbuffered DIMM slots in the NAS chassis.

How are the modules installed, and which step do people often miss?

Power off the NAS, open the chassis, align each 240-pin module with the slot key, press firmly until the retention clips click, then close the case before powering on — skipping the full clip engagement is the common mistake.

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