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Black 1U rackmount NAS chassis with four drive bays and front status LEDs

Synology Inc.

Synology RS1626xs+ Xeon D-1726 4-Bay Rackmount NAS 16GB 80TB 25GbE

SKU CH-55C2-NZ80G

Enterprise 4-bay rackmount NAS with Xeon D-1726 processor, 16GB DDR4, dual 10GbE and dual 25GbE ports, plus 80TB of Synology Enterprise drives pre-installed

  • Port RJ-452 x RJ-45 10GbE LAN Ports 2 x SFP28 25GbE Ports via Synology
  • Port USB2 x USB 3.2 Gen 1 Ports
  • Form Factor4-Bay
  • ProcessorIntel Xeon
  • Installed Memory16GB
  • Included HDD Capacity80TB (4 x 20TB)
  • Ready-to-deploy 4-bay NAS fully assembled and tested
  • Intel Xeon D-1726 6-core CPU handles virtualization and heavy workloads
  • 16GB DDR4 ECC memory protects data integrity under load
  • Dual 25GbE SFP28 plus dual 10GbE RJ-45 for high-speed networking
  • 80TB raw capacity from four 20TB enterprise drives included

4-Bay Xeon Rackmount NAS

The Synology RS1626xs+ is a 1U enterprise NAS built around an Intel Xeon D-1726 six-core processor with 16GB DDR4 ECC memory. It ships fully assembled with four 20TB Synology Enterprise drives for 80TB of raw capacity and includes a dual-port 25GbE SFP28 adapter plus two 10GbE RJ-45 ports. The platform targets businesses running virtualization, heavy file sharing, backup and surveillance workloads that need high throughput and data integrity.

80TB raw with NVMe cache headroom

Four 20TB drives deliver 80TB before RAID overhead; dual M.2 NVMe slots accept cache SSDs to accelerate random I/O for databases or virtual machines. The Xeon D-1726 and 16GB ECC RAM handle concurrent VMs and snapshot schedules comfortably, while the PCIe Gen4 x8 slot remains free for additional networking or storage controllers. Memory can be expanded to 64GB when workloads outgrow the factory configuration.

Scales beyond four bays with expansion units

The RS1626xs+ connects to compatible Synology expansion units to grow from four to sixteen drive bays, letting capacity scale without replacing the head unit. Organizations that need more than 80TB raw or denser drive configurations can add shelves rather than migrating to a larger chassis. Buyers who require GPU transcoding, fibre-channel connectivity or a higher core count than the six-core Xeon D-1726 provides should evaluate larger RackStation models.

Highlights

  • Ready-to-deploy 4-bay NAS fully assembled and tested
  • Intel Xeon D-1726 6-core CPU handles virtualization and heavy workloads
  • 16GB DDR4 ECC memory protects data integrity under load
  • Dual 25GbE SFP28 plus dual 10GbE RJ-45 for high-speed networking
  • 80TB raw capacity from four 20TB enterprise drives included

Specifications

BrandSynology
ModelRS1626xs+
Port RJ-452 x RJ-45 10GbE LAN Ports
2 x SFP28 25GbE Ports via Synology PCIe Card
1 x Out-of-Band Management LAN Port
Port USB2 x USB 3.2 Gen 1 Ports
Form Factor4-Bay
ProcessorIntel Xeon
Installed Memory16GB
Included HDD Capacity80TB (4 x 20TB)
ManagementWeb-Based, DHCP Client
LEDsPower, HDD (Hard Disk Drive), LAN (10/100)
Power100-240 VAC 50/60Hz
Temperature5°C - 35 °C
Humidity8% to 80% RH
Dimensions44 mm × 481.9 mm × 668.5 mm
Weight9.5 kg
Package ContentsMain Unit × 1
Accessory Pack × 1
C13 to C14 power cord × 2
Front Cover × 1
All Configuration Items

Questions about this item

Will the dual 10GbE RJ-45 ports and 25GbE SFP28 adapter connect to my existing 1GbE switch without a new switch?

Yes. The 10GbE RJ-45 ports auto-negotiate down to 1GbE, and the 25GbE SFP28 ports can use 10GbE or 1GbE transceivers so the RS1626xs+ works with your current switch immediately.

How do I verify the Xeon D-1726 and 16GB DDR4 ECC memory are running correctly after first boot?

Open DSM Control Panel > Info Center. The System tab shows Intel Xeon D-1726 with 6 cores and 16GB DDR4 ECC RDIMM. Run the built-in memory test from the same page to confirm ECC operation.

Which drives and accessories arrive pre-installed versus what I must add for NVMe caching?

The unit ships with four 20TB Synology Enterprise drives installed, 16GB DDR4 ECC RAM, the 2-port 25GbE PCIe adapter, two C13-C14 power cords, front cover, and accessory pack. NVMe SSDs for the two M.2 slots are not included.

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