| 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) | Yes |
| 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 | 4 GB DDR3L |
| Memory Module Pre-installed | 4GB (1 x 4GB) |
| Total Memory Slots | 2 |
| Memory Expandable up to | 8 GB (4 GB x 2) |
| Storage | |
| Drive Bays | 4 |
| Maximum Drive Bays with Expansion Unit | 9 |
| M.2 Drive Slots | 2 |
| Compatible Drive Type* (See all supported drives) | 3.5" SATA HDD 2.5" SATA HDD 2.5" SATA SSD M.2 NVMe 2280 SSD |
| Maximum Internal Raw Capacity | 40 TB (10 TB drive x 4) (Capacity may vary by RAID types) |
| Maximum Raw Capacity with Expansion Units | 90 TB (10 TB drive x 9) (Capacity may vary by RAID types) |
| Maximum Single Volume Size | 108 TB |
| Hot Swappable Drive | Yes |
| 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 single volume size is not directly related to the maximum raw capacity. (Learn more) Expansion of the internal volume is only supported if the combined single volume size does not exceed the maximum limit of 108TB. |
| 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 199 mm x 223 mm |
| Weight | 2.28 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* | 19.8 dB(A) |
| Scheduled Power On/Off | Yes |
| Wake on LAN/WAN | Yes |
| Power Supply Unit / Adapter | 100W |
| AC Input Power Voltage | 100V to 240V AC |
| Power Frequency | 50/60 Hz, Single Phase |
| Power Consumption* | 28.8 W (Access) 12.6 W (HDD Hibernation) |
| British Thermal Unit | 98.27 BTU/hr (Access) 42.99 BTU/hr (HDD Hibernation) |
| Environment Temperature | |
| Operating Temperature | 5°C to 40°C (40°F to 104°F) |
| Storage Temperature | -20°C to 60°C (-5°F to 140°F) |
| Relative Humidity | 5% to 95% RH |
| Certification | FCC Class B CE Class B BSMI Class B |
| Notes | Power consumption is measured when fully loaded with Western Digital 1TB WD10EFRX hard drive(s). |
| DSM Specifications (See more) | |
| Storage Management | |
| Maximum Internal Volume Number | 512 |
| Maximum iSCSI Target Number | 32 |
| Maximum iSCSI LUN | 256 |
| iSCSI LUN Clone/Snapshot, Windows ODX | 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 |
| Volume Expansion by Adding a HDD | Synology Hybrid RAID RAID 5 JBOD 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) |
| SSD Support | |
| SSD Read/Write Cache (White Paper) | Yes |
| SSD TRIM | Yes |
| File Sharing Capacity | |
| Maximum Local User Accounts | 2048 |
| Maximum Local Groups | 256 |
| Maximum Shared Folder | 512 |
| Maximum Shared Folder Sync Tasks | 8 |
| Maximum Concurrent CIFS/AFP/FTP Connections | 1000 |
| Windows Access Control List (ACL) Integration | Yes |
| NFS Kerberos Authentication | Yes |
| High Availability Manager | Yes |
| Log Center | Yes |
| Syslog Events per Second | 800 |
| Virtualization | |
| VMware vSphere 6 with VAAI | Yes |
| Windows Server 2012 | Yes |
| Windows Server 2012 R2 | Yes |
| Citrix Ready | Yes |
| OpenStack | Yes |
| Add-on Packages (learn more about the complete add-on package list) | |
| Antivirus by McAfee (Trial) | Yes |
| Central Management System | Yes |
| Chat | Yes |
| Maximum Users | 1500 |
| 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. For tested models with expandable memory, the maximum amount of RAM was installed. |
| Cloud Station Server | Yes |
| Maximum Number of Concurrently Connected Devices | 1000 |
| Maximum Number of Concurrently Connected Devices (with RAM expansion) | 2000 |
| Maximum Number of Synced Files (btrfs) | 1,000,000 / single file reaction time 744 ms |
| Maximum Number of Synced Files (ext4) | 1,000,000 / single file reaction time 630 ms |
| Notes | The maximum number of concurrently connected devices refers to the maximum number of devices that can remain connected at the same time. For more information on file processing capability, please refer to the reaction time for file processing. File reaction time refers to the preparation time required for other devices to start downloading a 1KByte file from a Synology NAS after the file has been added to the NAS. RAM expansion was not used during testing. Non-encrypted shared folders were used during the aforementioned testing. |
| Document Viewer | Yes |
| Download Station | Yes |
| Maximum Concurrent Download Tasks | 80 |
| exFAT Access (optional) | Yes |
| MailPlus / MailPlus Server | Yes |
| Free Email Accounts | 5 (Licenses required for additional accounts) |
| Recommended MailPlus Client Number | Up to 90 (Btrfs) / 90 (ext4) |
| Maximum Server Performance | 840,000 (Btrfs) / 1,014,000 (ext4) emails per day, approx. 25.6 GB (Btrfs) / 30.9 GB (ext4) |
| Notes | The CPU and RAM usages were both under 80% when testing recommended client numbers. For tested models with expandable memory, the maximum amount of RAM was installed. 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 | Yes |
| DLNA Compliance | Yes |
| Office | Yes |
| Maximum Users | 200 |
| Maximum Simultaneous Editing Users | 80 |
| Notes | 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 |
| Snapshot Replication | Yes |
| Maximum Snapshots per Shared Folder | 1024 |
| Maximum Snapshots of all Shared Folder | 65536 |
| Surveillance Station | Yes |
| Maximum IP cam (Licenses required) | 40 (including 2 Free License) (See All Supported IP Cameras) |
| Total FPS (H.264)* | 1200 FPS @ 720p (1280x720) 840 FPS @ 1080p (1920×1080) 400 FPS @ 3M (2048x1536) 300 FPS @ 5M (2591x1944) 180 FPS @ 4K (3840x2160) |
| Total FPS (H.265)* | 1200 FPS @ 720p (1280x720) 1200 FPS @ 1080p (1920×1080) 600 FPS @ 3M (2048x1536) 400 FPS @ 5M (2591x1944) 300 FPS @ 4K (3840x2160) |
| Total FPS (MJPEG)* | 480 FPS @ 720p (1280x720) 400 FPS @ 1080p (1920×1080) 330 FPS @ 3M (2048x1536) 200 FPS @ 5M (2591x1944) |
| 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. |
| Video Station | Yes |
| 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 |
| VPN Server | Yes |
| Maximum Connections | 20 |
| 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 D3NS1866L-4G RAM Module Expansion Unit: DX517 X 1 VS360HD VS960HD |
