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Green circuit board SODIMM module with black memory chips and gold edge connector

Timetec

Timetec DDR4-2666 4GB Synology D4NESO-2666-4G Replacement SODIMM memory upgrade

SKU CH-64MF-HKH90

4GB DDR4-2666 SODIMM upgrade for Synology 16, 18, 19 and 20 series NAS units

  • Total capacity4 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • Designed for Synology 20 series NAS models
  • Verified for 19 series and 18 series devices
  • 4 GB DDR4 2666 MHz for faster data access
  • Non-ECC unbuffered SODIMM at 1.2 V CL19
  • Lifetime warranty with US-based technical support

Synology 20/19/18 Series Compatibility

This 4 GB DDR4-2666 SODIMM is built as a direct replacement for the Synology D4NESO-2666-4G module. It targets owners of compatible DiskStation and RackStation units who need to expand system memory for smoother multitasking and heavier workloads.

260-Pin Unbuffered Non-ECC Build

The stick uses a standard 260-pin SO-DIMM edge connector with 1.2 V operation and CL19 timing. Single-rank 1Rx8 organisation based on 512x8 chips means it fits the memory slots of the listed 20, 19 and 18 series models without requiring ECC or registered memory support.

Upgrade From 4 GB Or Empty Slot

Adding this module increases total capacity for virtual machines, Docker containers and large file transfers. The jump is worthwhile when the NAS runs near its current memory limit during concurrent services; it will not help if the bottleneck lies in CPU throughput or drive throughput.

How it compares

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

Price $23.99
Cheaper than about 88% 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 $6.00 per GB
Cheaper than about 65% 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
Total capacity4 GB
Performance
Rated speedDDR4 2666 (PC4 21300)

Questions about this item

Does this DDR4-2666 SODIMM run at its rated 2666 MHz on a Synology DS920+?

Yes, the module is specified as DDR4 2666 (PC4-21300) and is listed as compatible with the DS920+ and other 20-series models, so it will operate at that speed.

Will this 260-pin SODIMM fit inside a Synology DS720+ without clearance issues?

The stick uses the standard 260-pin SODIMM form factor required by the DS720+ and other listed models; no extra height or width is mentioned.

What is the correct way to seat this module in a DS220+ and what mistake should I avoid?

Insert the SODIMM at an angle into the slot, then press down firmly until the side clips click; the common error is stopping before both clips engage.

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