Hardware Specifications
CPU
CPU Model Intel Celeron J3455
CPU Architecture 64-bit
CPU Frequency Quad Core 1.5 burst up to 2.3 GHz
Hardware Encryption Engine (AES-NI)

Hardware Transcoding Engine H.264 (AVC), H.265 (HEVC), MPEG-2 and VC-1; maximum resolution: 4K (4096 x 2160); maximum frame rate per second (FPS): 30

Memory
System Memory : 8 GB DDR3L
Memory Module : Pre-installed 8 GB (4 GB x 2)
Total Memory Slots : 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 : 10
M.2 Drive Slots : 2 (NVMe)
Compatible Drive Type*?(See all supported drives)
3.5″ SATA HDD
2.5″ SATA HDD
2.5″ SATA SSD
M.2 2280 NVMe SSD

Maximum Internal Raw Capacity 70 TB (14 TB drive x 5) (Capacity may vary by RAID types)
Maximum Raw Capacity with Expansion Units 140 TB (70 TB + 14 TB drive x 5) (Capacity may vary by RAID types)
Maximum Single Volume Size 108 TB
Hot Swappable Drive

Notes
“Compatible drive type” indicates the drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
The maximum raw capacity is not limited by the maximum single volume size. Synology NAS models may utilize capacities over the maximum single volume size as long as each volume created is below the limit.?(Learn more)

External Ports
RJ-45 1GbE LAN Port 2 (with Link Aggregation / Failover support)
USB 3.0 Port 2
eSATA Port 1
File System
Internal Drives
Btrfs
EXT4

External Drives
Btrfs
EXT4
EXT3
FAT
NTFS
HFS+
exFAT*

Notes exFAT Access is purchased separately in Package Center.
Appearance
Size (Height x Width x Depth) 166 mm x 230 mm x 223 mm
Weight 2.54 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

Power Recovery

Noise Level* 20.8 dB(A)
Scheduled Power On/Off

Wake on LAN/WAN

Power Supply Unit / Adapter 120W
AC Input Power Voltage 100V to 240V AC
Power Frequency 50/60Hz, Single Phase
Power Consumption* 38.59 W (Access)
13.32 W (HDD Hibernation)
British Thermal Unit 131.67 BTU/hr (Access)
45.45 BTU/hr (HDD Hibernation)
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
Certification
EAC
VCCI
CCC
RCM
FCC
CE
BSMI

Warranty 3 Years
Notes
The warranty period starts from the purchase date as stated on your purchase receipt.?(Learn more)
Power consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s).
Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in idle; Two G.R.A.S. Type 40AE microphones, each set up at 1 meter away from the Synology NAS front and rear; Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75?C; Humidity: 58.2-61.8%

DSM Specifications?( See more )
Storage Management
Maximum Internal Volume Number 512
Maximum iSCSI Target Number 128
Maximum iSCSI LUN 256
iSCSI LUN Clone/Snapshot, Windows ODX

SSD Read/Write Cache?(White Paper)

SSD TRIM

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 (with Expansion Unit)

Global Hot Spare Supported RAID Type
Synology Hybrid RAID
RAID 1
RAID 5
RAID 6 (with Expansion Unit)
RAID 10 (with Expansion Unit)

File Services
File Protocol CIFS/AFP/NFS/FTP/WebDAV
Maximum Concurrent CIFS/AFP/FTP Connections 2,000
Windows Access Control List (ACL) Integration

NFS Kerberos Authentication

Account & Shared Folder
Maximum Local User Accounts 2,048
Maximum Local Groups 256
Maximum Shared Folder 512
Maximum Shared Folder Sync Tasks 32
High Availability Manager

Log Center

Syslog Events per Second 800
Virtualization
VMware vSphere 6 with VAAI

Windows Server 2016

Citrix Ready

OpenStack

Add-on Packages?(learn more about the complete add-on package list)
Antivirus by McAfee (Trial)

Central Management System

Chat

Maximum Users 1,500
Notes
The number of concurrent HTTP connections for Chat was configured to the maximum.
CPU and RAM usage were both under 80% when the number of maximum users was reached.

Cloud Station Server

Recommended Number of Hosted Files 500,000
Recommended Number of Concurrent Sync Clients 2,000 (the number of connections that can be maintained when the recommended number of hosted files was reached)
Notes
The maximum number of concurrently connected devices refers to the maximum number of devices that can remain connected at the same time.
The maximum number of hosted files refers to the maximum number of files that can be indexed and hosted by the Cloud Station Server service. RAM expansion was not used during testing.
Non-encrypted shared folders were used during the aforementioned testing.

Document Viewer

Download Station

Maximum Concurrent Download Tasks 80
exFAT Access (optional)

MailPlus / MailPlus Server

Free Email Accounts 5?(Licenses required for additional accounts)
Maximum number of concurrent users 100
Maximum Server Performance 1,052,000 emails per day, approx. 32GB
Notes
The CPU and RAM usage were both under 80% when testing the maximum number of concurrent users.
Read-write SSD cache was enabled in 5-bay (and above) NAS models with 2 SSDs units 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

Moments

Facial recognition

Subject recognition

Auto Color & Rotate

Moments Select

Snapshot Replication

Maximum Snapshots per Shared Folder 1,024
Maximum of system snapshots 65,536
Surveillance Station

Maximum IP cam?(Licenses required) 40 (including 2 Free License)?(See All Supported IP Cameras)
Total FPS (H.264)* 1200 FPS @ 720p (1280×720)
840 FPS @ 1080p (1920×1080)
550 FPS @ 3M (2048×1536)
300 FPS @ 5M (2591×1944)
180 FPS @ 4K (3840×2160)
Total FPS (H.265)* 1200 FPS @ 720p (1280×720)
1200 FPS @ 1080p (1920×1080)
900 FPS @ 3M (2048×1536)
550 FPS @ 5M (2591×1944)
300 FPS @ 4K (3840×2160)
Total FPS (MJPEG)* 720 FPS @ 720p (1280×720)
500 FPS @ 1080p (1920×1080)
330 FPS @ 3M (2048×1536)
200 FPS @ 5M (2591×1944)

Notes

Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera.
Synology Drive

Recommended Number of Hosted Files 500,000 (applies to files indexed or hosted by?Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Recommended Number of Concurrent Sync Clients 450 (the number of connections that can be maintained when the recommended number of hosted files was reached)
Notes
Exceeding the limits above may result in longer response time in file operations.
Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.

Synology Office

Maximum Users 1,800
Notes
Multiple files were opened for testing and each file was edited by 30 users simultaneously.
CPU and RAM usage were both under 80% when the number of maximum users was reached.
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

Video Transcoding 4K Group 1?(See more)
Maximum Transcoding Channel Number 2 channel, 30 FPS @ 4K (4096 x 2160), H.264 (AVC)/H.265 (HEVC) or
2 channel, 30 FPS @ 1080p (1920_1080), H.264 (AVC)/H.265 (HEVC)/MPEG-2/VC-1
Virtual Machine Manager

Recommended Virtual Machine Instances 4?(Learn more)
Recommended Virtual DSM Number?(Licenses required) 4 (including 1 Free License)
Notes
Virtual Machine Manager is not supported on hosts running?Synology High Availability.?
The specifications vary depending on system configuration and memory size.

VPN Server

Maximum Connections 30
Environment & Packaging
Environment RoHS Compliant
Packaging Content
Main Unit X 1
Accessory Pack X 1
AC Power Adapter X 1
AC Power Cord X 1
RJ-45 LAN Cable X 2
Quick Installation Guide X 1

Optional Accessories
Surveillance Device License Pack
Expansion Unit:?DX517?X 1
VS360HD
VS960HD