Hardware Specifications

CPU

CPU Model

• AMD Ryzen R1600

CPU Quantity

• 1

CPU Architecture

• 64-bit

CPU Frequency

• 2-core 2.6 (base) / 3.1 (turbo) GHz

Hardware Encryption Engine (AES-NI)

• Yes

Memory

System Memory

• 8 GB DDR4 ECC SODIMM

Memory Module Pre-installed

• 8 GB (8 GB x 1)

Total Memory Slots

• 2

Maximum Memory Capacity

• 32 GB (16 GB x 2)

Notes

• Synology reserves the right to replace memory modules with the same or higher frequency based on supplier's product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
• Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion.

Storage

Drive Bays

• 5

Maximum Drive Bays with Expansion Unit

• 15 (DX517 x 2)

M.2 Drive Slots

• 2 (NVMe)

Compatible Drive Type

• 3.5" SATA HDD
• 2.5" SATA SSD
• M.2 2280 NVMe SSD

Hot Swappable Drive

• Yes

Notes

• "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.

External Ports

RJ-45 1GbE LAN Port

• 4 (with Link Aggregation / Failover support)

USB 3.2 Gen 1 Port

• 2

eSATA Port

• 2

Notes

• This device's 1GbE LAN ports have a maximum transmission unit (MTU) size of 1,500 bytes.
• The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.

PCIe

PCIe Expansion

• 1 x Gen3 x2 network upgrade slot

File System

Internal Drives

• Btrfs
• EXT4

External Drives

• Btrfs
• EXT4
• EXT3
• FAT
• NTFS
• HFS+
• exFAT

Appearance

Dimensions (H x W x D)

• 166 x 230 x 223 mm

Weight

• 2.7 kg

Others

System Fan

• 92 mm x 92 mm x 2 pcs

Fan Speed Mode

• Full-Speed Mode
• Cool Mode
• Quiet Mode

Brightness Adjustable Front LED Indicators

• Yes

Power Recovery

• Yes

Noise Level

• 22.90 dB(A)

Scheduled Power On / Off

• Yes

Wake on LAN / WAN

• Yes

Power Supply Unit / Adapter

• 120 W

AC Input Power Voltage

• 100V to 240V AC

Power Frequency

• 50/60 Hz, Single Phase

Power Consumption

• 52.06 W (Access)
• 16.71 W (HDD Hibernation)

British Thermal Unit

• 177.64 BTU/hr (Access)
• 57.02 BTU/hr (HDD Hibernation)

Notes

• Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle stae. Two G.R.A.S. Type 40AE microphones are placed at a 1 m distance from the front and rear of the device. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75°C; Humidity: 58.2-61.8%

Temperature

Operating Temperature

• 0°C to 40°C (32°F to 104°F)

Storage Temperature

• -20°C to 60°C (-5°F to 140°F)

Relative Humidity

• 5% to 95% RH

Certifications

Certification

• FCC
• CE
• BSMI
• VCCI
• RCM
• UKCA
• EAC
• CCC
• KC

Environment

• RoHS Compliant

Software Specifications

DSM Specifications

Storage Management

Maximum Single Volume Size

• 108 TB

Maximum Internal Volume Number

• 64

SSD Read / Write Cache (White Paper)

• Yes

SSD TRIM

• Yes

Supported RAID Type

• Synology Hybrid RAID
• Basic
• JBOD
• RAID 0
• RAID 1
• RAID 5
• RAID 6
• RAID 10

RAID Migration

• Basic to RAID 1
• Basic to RAID 5
• RAID 1 to RAID 5
• RAID 5 to RAID 6

Volume Expansion with Larger HDDs

• Synology Hybrid RAID
• RAID 1
• RAID 5
• RAID 6
• RAID 10

Volume Expansion by Adding a HDD

• Synology Hybrid RAID
• JBOD
• RAID 5
• RAID 6

Global Hot Spare Supported RAID Type

• Synology Hybrid RAID
• RAID 1
• RAID 5
• RAID 6
• RAID 10

Notes

• Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored.
• Each internal volume (may consist of multiple drives) is expandable up to 108TB.

File Services

File Protocol

• SMB/AFP/NFS/FTP/WebDAV

Maximum Concurrent SMB/AFP/FTP Connections

• 2,000

Maximum Concurrent SMB/AFP/FTP Connections (with RAM expansion)

• 2,000

Windows Access Control List (ACL) Integration

• Yes

NFS Kerberos Authentication

• Yes

Notes

• Regarding data concerning tests with RAM expansion, all memory slots are installed with the maximum capacity of supported RAM.
• The testing standard was based on the maximum number of concurrent connections supported by this model. During the testing, 25% of the connections were used to transfer files concurrently. The transfer process guaranteed that the connections were not interrupted; the minimum transfer speed was not guaranteed.

Account & Shared Folder

Maximum Local User Accounts

• 2,048

Maximum Local Groups

• 256

Maximum Shared Folder

• 512

Maximum Shared Folder Sync Tasks

• 32

Hybrid Share

Hybrid Share Folder Number

• 10

High Availability

Synology High Availability

• Yes

Log Centre

Syslog Events per Second

• 800

Virtualizations

VMware vSphere with VAAI

• Yes

Windows Server 2016

• Yes

Windows Server 2019

• Yes

Citrix Ready

• Yes

OpenStack

• Yes

General Specifications

Networking Protocols

• SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV

Supported Browsers

• Google Chrome
• Firefox
• Microsoft Edge
• Safari

Supported Language

• English
• German
• French
• Italian
• Spanish
• Danish
• Norwegian
• Swedish
• Dutch
• Russian
• Polish
• Hungarian
• Portuguese (Brazil)
• Portuguese (Europe)
• Turkish
• Czech
• Thai
• Japanese
• Korean
• Chinese (Traditional)
• Chinese (Simplified)

Notes

• For an updated list of supported browser versions, check the DSM Technical Specifications.

Add-on Packages view the complete package list

Antivirus by McAfee (Trial)

• Yes

Central Management System

• Yes

Synology Chat

Maximum Number of Concurrent Users

• 100

Notes

• Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds.
• When applicable, systems are tested configured with maximum memory and set to allow the maximum number of connections.

Document Viewer

• Yes

Download Station

Maximum Concurrent Download Tasks

• 80

SAN Manager

Maximum iSCSI Target Number

• 128

Maximum LUN

• 256

LUN Clone/Snapshot, Windows ODX

• Yes

Synology MailPlus / MailPlus Server

Free Email Accounts

• 5 (Licences required for additional accounts)

Maximum Number of Concurrent Users

• 100

Maximum Server Performance

• 1,224,000 emails per day, approx. 37GB

Notes

• Models with more than 4 bays were installed with two SSDs for SSD cache.
• For tested models with expandable memory, the maximum amount of RAM was installed.
• The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.
• Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only).

Media Server

DLNA Compliance

• Yes

Synology Photos

Facial Recognition

• Yes

Snapshot Replication

Maximum Snapshots per Shared Folder

• 1,024

Maximum of System Snapshots

• 65,536

Surveillance Station

Maximum IP cam (Licences required)

• 40 (including 2 Free Licence)

Total FPS (H.264)

• 1200 FPS @ 720p (1280x720)
• 1050 FPS @ 1080p (1920x1080)
• 600 FPS @ 3M (2048x1536)
• 360 FPS @ 5M (2591x1944)
• 200 FPS @ 4K (3840x2160)

Total FPS (H.265)

• 1200 FPS @ 720p (1280x720)
• 1200 FPS @ 1080p (1920x1080)
• 1000 FPS @ 3M (2048x1536)
• 600 FPS @ 5M (2591x1944)
• 300 FPS @ 4K (3840x2160)

Notes

• Maximum IP cameras and FPS figures are tested with the device fully populated with drives and under a continuous recording setup.
• Actual system capabilities may differ depending on system configuration, drive performance, number of features enabled, and if additional workloads are present.

Synology Drive

Recommended Number of Concurrent Sync Clients

• 350 (the number of connections that can be maintained when the recommended number of hosted files was reached)

Recommended Number of Hosted Files

• 5,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)

Notes

• Exceeding the recommended numbers above will not block application operations, but may result in longer response time.
• Utilizing SSD cache can significantly improve performance.
• For tested models with expandable memory, the maximum amount of RAM was installed.
• Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.

Synology Office

Maximum Users

• 1,200

Notes

• Multiple files were opened for testing and each file was edited by 30 users simultaneously.
• For tested models with expandable memory, the maximum amount of RAM was installed.
• Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM

Video Station

• Yes

Virtual Machine Manager

Recommended Virtual Machine Instances

• 4

Recommended Virtual DSM Number (Licences required)

• 4 (including 1 Free Licence)

Notes

• The specifications vary depending on system configuration and memory size.

VPN Server

Maximum Connections

• 40

Package

Package Content

• 1 x DS1522+
• 1 x Accessory Pack
• 1 x AC Power Adapter
• 1 x AC Power Cord
• 2 x RJ-45 LAN Cable
• 1 x Quick Installation Guide