12-bay 2U redundant-power rackmount NAS
Synology RackStation RS3621RPxs 12-Bay Rackmount NAS
The Synology RackStation RS3621RPxs is a 12-bay 2U business storage server with a 6-core Intel Xeon processor, expandable ECC memory, redundant power and dual PCIe slots for compatible high-speed networking or cache options.
- Processor
- Intel Xeon D-1531
- Memory
- 8 GB DDR4 ECC UDIMM
- Drive bays
- 12 / up to 36 (RX1217 × 2)
- Networking
- 4 × 1GbE RJ-45
Protect growing business datasets with redundant power and scale-up capacity
The RS3621RPxs provides twelve hot-swappable bays and supports up to 36 bays with two RX1217 units. Its redundant power, four onboard 1GbE ports and dual PCIe slots make it a flexible foundation for file storage, backup, collaboration and surveillance workloads managed through Synology DSM.
Twelve hot-swappable bays
Build a sizeable SATA storage pool and service compatible drives without shutting down the system.
Scale to 36 drive bays
Two RX1217 expansion units provide a verified path to three times the internal bay count.
Six-core Xeon platform
The Intel Xeon D-1531 provides 6 cores and 12 threads for concurrent business services.
Expandable ECC memory
Start with 8 GB DDR4 ECC UDIMM and expand to a verified maximum of 64 GB.
Dual PCIe expansion
Two Gen3 x8 slots support compatible higher-speed networking or M.2 cache adapter options.
Redundant power supplies
Dual PSUs help maintain service if one supply or power cord becomes unavailable.
Who is the Synology RS3621RPxs best for?
A strong choice for
- Business file storage and backup
- Organisations requiring redundant power
- Deployments scaling from 12 to 36 bays
- Teams planning compatible 10/25GbE expansion
- Multi-service DSM environments
Consider another model if you need
- Built-in 10GbE rather than an add-in card
- A compact short-depth rack system
- Fewer than 12 internal bays
- A dual-controller storage architecture
Key specifications
- Model
- RS3621RPxs
- Product type
- 12-bay 2U redundant-power rackmount NAS
- Processor
- Intel Xeon D-1531, 6 cores, 12 threads
- CPU frequency
- 2.2 GHz base / 2.7 GHz turbo
- System memory
- 8 GB DDR4 ECC UDIMM
- Maximum memory
- 64 GB (16 GB × 4)
- Drive bays
- 12; up to 36 (RX1217 × 2)
- Drive types
- 12 × 3.5-inch SATA HDD or 2.5-inch SATA SSD
- Networking
- 4 × 1GbE RJ-45
- PCIe expansion
- 2 × Gen3 x8 slots (x8 link)
- Dimensions (H × W × D)
- 88 × 482 × 724 mm
- Warranty
- 5 years
Full technical specifications
Processor and memory
| Model | RS3621RPxs |
|---|---|
| CPU model | Intel Xeon D-1531 |
| CPU quantity | 1 |
| CPU cores and threads | 6 cores, 12 threads |
| CPU architecture | 64-bit |
| CPU frequency | 2.2 GHz base / 2.7 GHz turbo |
| Hardware encryption engine | Supported |
| System memory | 8 GB DDR4 ECC UDIMM |
| Pre-installed memory | 8 GB (8 GB × 1) |
| Total memory slots | 4 |
| Maximum memory capacity | 64 GB (16 GB × 4) |
| Memory guidance | Use Synology memory modules and follow the exact-model manual for supported configurations |
Storage, network and expansion
| Drive bays | 12 |
|---|---|
| Maximum drive bays with expansion | 36 (RX1217 × 2) |
| Compatible drive types | 12 × 3.5-inch SATA HDD or 2.5-inch SATA SSD |
| Hot-swappable front drives | Supported |
| Network ports | 4 × 1GbE RJ-45 |
| USB ports | 2 × USB 3.2 Gen 1 |
| Expansion connection | 2 × Infiniband |
| PCIe expansion | 2 × Gen3 x8 slots (x8 link) |
| Drive compatibility | Use only drives listed for the exact system on Synology’s current compatibility list |
Physical design and power
| Form factor | 2U |
|---|---|
| Size (H × W × D) | 88 × 482 × 724 mm |
| Weight | 14.5 kg |
| Rack installation | 4-post 19-inch rack; RKS-02 rail kit sold separately |
| System fans | 80 × 80 mm × 4 |
| Fan modes | Full-speed, cool and quiet |
| Noise level | 50.2 dB(A) |
| Power recovery | Supported |
| Power supply unit | 500 W or 550 W depending on hardware revision |
| Redundant power supply | Yes |
| AC input | 100 V to 240 V AC |
| Power frequency | 50/60 Hz, single phase |
| Power consumption | 140.01 W (access); 65.94 W (HDD hibernation) |
| British Thermal Unit | 477.43 BTU/hr (access); 224.86 BTU/hr (HDD hibernation) |
Environment, warranty and package
| Operating temperature | 0°C to 35°C |
|---|---|
| Storage temperature | -20°C to 60°C |
| Operating humidity | 8% to 80% RH |
| Storage humidity | 5% to 95% RH |
| Certifications | FCC, CE, BSMI, VCCI, RCM, EAC, CCC, KC, BIS, UL |
| Environment | RoHS compliant |
| Warranty | 5 years |
| Package contents | Main unit × 1; accessory pack × 1; AC power cord × 2; quick installation guide × 1 |
Frequently asked questions about the Synology RS3621RPxs
What is the Synology RS3621RPxs?
The Synology RS3621RPxs is a 12-bay 2U redundant-power rackmount NAS designed for centralised file storage, backup and data management through Synology DSM.
Which processor is in the RS3621RPxs?
It uses the Intel Xeon D-1531 with 6 cores, 12 threads, operating at 2.2 GHz base / 2.7 GHz turbo.
How much memory does the RS3621RPxs include?
It includes 8 GB DDR4 ECC UDIMM and supports a verified maximum of 64 GB (16 GB × 4).
How many drive bays does the RS3621RPxs have?
It provides 12 and supports up to 36 (RX1217 × 2).
Which drives are supported by the RS3621RPxs?
The verified drive categories are 12 × 3.5-inch SATA HDD or 2.5-inch SATA SSD. Confirm the exact drive model on Synology's current compatibility list before purchase.
What network ports are built into the RS3621RPxs?
The RS3621RPxs includes 4 × 1GbE RJ-45.
What expansion is available for the RS3621RPxs?
It provides 2 × Gen3 x8 slots (x8 link) plus 2 × Infiniband. Use only options listed for the exact model.
Does the RS3621RPxs have redundant power?
Yes. The RS3621RPxs includes redundant power supplies.
What are the dimensions of the RS3621RPxs?
It measures 88 × 482 × 724 mm in height × width × depth and weighs 14.5 kg.
What warranty applies to the RS3621RPxs?
Synology specifies 5 years. Warranty coverage starts from the purchase date shown on the receipt, and extension availability varies by region.
- This product is supplied diskless unless the listing explicitly states otherwise; storage drives are sold separately.
- Confirm drives, memory, expansion units, rail kits and add-in cards on Synology’s current compatibility list for the exact model before purchase.
- Actual storage capacity and performance depend on the installed drives, RAID or storage configuration, network and workload.
- The power supply is 500 W on specified SYR hardware revisions and 550 W on specified UTR/VR2 revisions; check the unit serial number and Synology Product Change Notice.
