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Two green DDR4 SODIMM modules, black chips, no heat spreader, 260 pins

NEMIX RAM

NEMIX RAM 32GB (2x16GB) DDR4 2666 CL19 ECC SODIMM Synology DS723+

SKU CH-X0H0-XCYX9

32 GB dual-channel DDR4 ECC SODIMM kit at 2666 MHz CL19, validated for Synology DS723+

  • Total capacity32 GB (2 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 32 GB total capacity in a matched 2 × 16 GB kit
  • DDR4 2666 MHz speed rated at PC4‑21300 bandwidth
  • ECC unbuffered design detects and corrects single‑bit errors
  • Low 1.20 V operation reduces power draw and heat
  • Validated for Synology DiskStation DS723+ compatibility

32GB ECC SODIMM kit for Synology DS723+

This 32GB kit contains two 16GB DDR4 2666 SODIMM modules built for the Synology DiskStation DS723+. ECC unbuffered operation adds error correction for data integrity in NAS workloads. The 2Rx8 rank configuration matches the platform requirements. CL19 latency and 1.20V voltage follow the JEDEC PC4-21300 standard.

260-pin unbuffered modules without heat spreaders

Each module uses a 260-pin DDR4 SODIMM edge connector that seats directly in the DS723+ memory slots. Major OEM chips from Samsung, Micron or Hynix are used depending on supply. The unbuffered design keeps latency low for the NAS CPU. No heat spreader is fitted, so the modules fit the tight clearance inside the DiskStation chassis.

Verify your DS723+ has two free SODIMM slots

Before ordering, confirm the DiskStation DS723+ has two available 260-pin DDR4 SODIMM sockets and supports 32GB total capacity. The system must accept ECC unbuffered DDR4 2666 modules at 1.20V. Check the Synology hardware guide for the maximum supported memory per slot and the approved rank configuration.

How it compares

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

Price $262.99
Cheaper than about 56% of the 21,161 comparable items (median $397.99).
Total capacity 32 GB (2 × 16 GB)
Typical for this category: the median of 20,941 items is 32 GB.
Price per GB $8.22 per GB
Typical for this category: the median of 20,941 items is $8.19 per GB.

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Specifications

Product
Brand nameNEMIX RAM
Product lineSynology Compatible Series NAS Memory
Model nameSynology DDR4 2666 MHz ECC Unbuffered SODIMM
Part numberMSE21300-628K2
Total capacity32 GB (2 × 16 GB)
Product type260-PIN DDR4 ECC SODIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items32 GB (2 × 16 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 260-PIN ECC Unbuffered SODIMM KIT

Questions about this item

What does the DDR4 2666 PC4-21300 rating cap in practice?

The kit runs at 2666 MT/s with CL19 latency; the memory controller in the Synology DS723+ will not exceed this speed.

What physical slot and pin count does this 260-pin SODIMM need?

It fits a standard 260-pin DDR4 SODIMM socket; the DS723+ has two such slots for the 2x16 GB modules.

How do you install the modules and what step is often missed?

Power off the NAS, open the chassis, align the notch on each 260-pin module, press firmly until the side clips click, then reassemble before powering on.

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