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Silver 2U rackmount chassis with twelve front drive bays and four rear network ports

Synology Inc.

Synology Inc. RS3618xs 12-bay rackmount NAS

SKU CH-NXP0-X683M MPN RS3618xs

A 12-bay 2U rackmount NAS with an Intel Xeon D-1521 quad-core 2.4 GHz CPU, 8 GB DDR4 ECC memory expandable to 64 GB, four Gigabit Ethernet ports, and capacity for up to 216 TB of SATA drives

  • Port RJ-454 x 10/100/1000M
  • Port USB2 x USB3.0
  • HDD Interface12 x SATA (12 x Bay)
  • Form Factor2U
  • ProcessorIntel Xeon D-1521 4-core 2.4 (base) / 2.7 (turbo) GHz
  • Installed Memory8GB DDR4

Model RS3618xs

  • 12 drive bays support up to 216 TB raw capacity
  • Quad-core Xeon D-1521 at 2.4 GHz base and 2.7 GHz turbo
  • 8 GB DDR4 ECC memory installed, expandable to 64 GB
  • Four Gigabit RJ-45 ports with optional 10 GbE expansion
  • Scales to 36 drives with RX1217 expansion units

12-bay 2U rackmount NAS for large-scale enterprises

The Synology RS3618xs is a diskless rackmount network-attached storage server built for organisations that need high throughput and capacity in a compact 2U form factor. It targets IT departments running virtualisation workloads, heavy file sharing or centralised backup for many concurrent users. Four integrated Gigabit Ethernet ports provide link aggregation and failover from day one.

Tool-less drive trays and optional expansion units

Twelve hot-swappable trays accept 3.5-inch or 2.5-inch SATA drives without tools, so initial population and later replacements are straightforward. The chassis can scale to 36 drives by attaching RX1217 or RX1217RP expansion units, though each additional enclosure adds cabling and rack space that must be planned. Memory upgrades use standard DDR4 ECC UDIMMs across four slots, reaching 64 GB total.

Steady power draw under continuous multi-user load

During sustained access the unit draws approximately 142.76 watts, dropping to 55.05 watts when drives enter hibernation. The Intel Xeon D-1521 quad-core processor maintains its 2.4 GHz base clock under prolonged virtualisation or backup streams, with turbo available for shorter bursts. Operating temperature range of 5 °C to 35 °C means adequate rack airflow is essential for 24/7 deployments.

Highlights

  • 12 drive bays support up to 216 TB raw capacity
  • Quad-core Xeon D-1521 at 2.4 GHz base and 2.7 GHz turbo
  • 8 GB DDR4 ECC memory installed, expandable to 64 GB
  • Four Gigabit RJ-45 ports with optional 10 GbE expansion
  • Scales to 36 drives with RX1217 expansion units

Specifications

BrandSynology
ModelRS3618xs
Port RJ-454 x 10/100/1000M
Port USB2 x USB3.0
HDD Interface12 x SATA (12 x Bay)
Form Factor2U
ProcessorIntel Xeon D-1521 4-core 2.4 (base) / 2.7 (turbo) GHz
Installed Memory8GB DDR4
Max Memory Capacity64GB
Memory Slot4
Included HDD CapacityDiskless System
Max Capacity216TB
Drive Compatibility3.5" SATA HDD
2.5" SATA HDD
2.5" SATA SSD
RAIDRAID 0, 1, 5, 6, 10, and JBOD
PowerPower Supply Unit / Adapter: 500 W
AC Input Power Voltage: 100V to 240V AC
Power Frequency: 50/60 Hz, Single Phase
Power Consumption142.76 W (Access)
55.05 W (HDD Hibernation)
UsageUltra high prerformance for large number of users
TemperatureOperating Temperature: 5°C to 35°C (40°F to 95°F)
Storage Temperature: -20°C to 60°C (-5°F to 140°F
Humidity5% to 95% RH
Dimensions88 mm x 482 mm x 724 mm
Weight14.5 kg
Shipping weight18.69 kg
Package size856 × 620 × 229 mm

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Questions about this item

How do I verify the RS3618xs is operating correctly after initial setup?

Log into DSM and confirm the Intel Xeon D-1521 shows four cores at 2.4 GHz base clock, all 12 drive bays report healthy SATA status, and the 8 GB DDR4 ECC UDIMM is recognised in the memory tab.

What ships with the RS3618xs and what must I purchase separately?

The 2U chassis, 500 W power supply, four RJ-45 1 GbE ports, two USB 3.0 ports and 8 GB DDR4 ECC UDIMM are included; drives, expansion units and additional memory modules are not.

Which memory capacity should I choose for the RS3618xs?

Start with the installed 8 GB DDR4 ECC UDIMM; add up to 64 GB total using the four UDIMM slots if your virtualization or user count demands more RAM.

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