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Green circuit board with black memory chips and gold edge connector

OWC

OWC 4GB DDR3L 1866 PC3L-14900 CL13 1Rx8 204-pin 1.35V SODIMM memory upgrade Synology DiskStation DS625slim

SKU CH-HMQR-S3D3N

A 4 GB DDR3L SODIMM at 1866 MHz CL13, 1.35 V, validated for Synology DS625slim NAS upgrades

  • Total capacity4 GB
  • Rated speedDDR3L 1866 (PC3L 14900)
  • CAS latencyCL13
  • Rated voltage1.35 V
  • Buffer typeUnbuffered
  • Memory rank1Rx8
  • Boosts multitasking on DS625slim with 4GB DDR3L 1866MHz
  • Low 1.35V DDR3L cuts power draw and heat
  • CL13 latency keeps data flowing smoothly
  • 204-pin SODIMM fits DS625slim slot exactly
  • JEDEC and RoHS compliant for warranty-safe upgrade

OWC 4GB DDR3L SODIMM for DS625slim

This 4GB DDR3L module is built specifically for the Synology DiskStation DS625slim. It runs at 1866MHz with CL13 latency and a low 1.35V voltage. The 204-pin unbuffered SODIMM format fits the NAS memory slot directly. It is designed for owners who need to expand the memory in this specific DiskStation model.

Replaces Synology D3NS1866L-4G part

The module serves as a direct replacement for the Synology part number D3NS1866L-4G. It matches the OEM specifications for speed, voltage, and form factor. The upgrade is worthwhile when the NAS shows sluggish multitasking or struggles with concurrent file operations. Buyers whose DS625slim already runs the maximum supported memory will not benefit from adding this module.

Single 4GB rank for light workloads

The 1Rx8 organisation provides a single 4GB rank of non-ECC memory. This capacity handles basic file serving, backup tasks, and light application hosting comfortably. It runs out quickly when running multiple virtual machines, heavy Docker containers, or large database workloads. Users planning intensive virtualisation should verify the maximum memory limit of the DS625slim before purchasing.

How it compares

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

Price $18.99
Cheaper than about 91% of the 21,161 comparable items (median $397.99).
Total capacity 4 GB
Lower than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $4.75 per GB
Cheaper than about 80% 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 number1S8T31R804 GB
Total capacity4 GB
Product type204-Pin DDR3L Non-ECC SODIMM
Performance
Rated speedDDR3L 1866 (PC3L 14900)
Memory
CAS latencyCL13
ECC supportNo
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.35 V
Compatibility
Compatible systemsSynology DiskStation DS625slim

Other versions of this model

5 more in the same range

Questions about this item

Will the 204-pin SODIMM fit the DS625slim memory slot?

Yes, the module uses the standard 204-pin DDR3L SODIMM form factor that matches the DS625slim slot.

What is the correct orientation for inserting the module and which notch alignment prevents damage?

Align the key notch on the gold edge connector with the slot ridge, press firmly until the side clips click, and avoid forcing it if resistance is felt.

Does the non-ECC unbuffered design mean the stick will need replacement sooner than ECC memory?

No, non-ECC unbuffered DDR3L is the specified type for the DS625slim and does not reduce module lifespan under normal NAS workloads.

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