Technical reference
Synology DS925+ specifications
Diskless enclosure with 4GB ECC RAM. SATA drives, NVMe SSDs, memory upgrades and the DX525 expansion unit are separate purchases.
Complete specifications with requirements, upgrade limits and sources. For our buying judgment, reviews and prices, return to the buying guide.
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Search all 152 specifications, including conditions and limits.
Processor and memory
4GB is the supplied configuration; larger application limits may need upgraded memory.
| CPU | AMD Ryzen V1500B[9][20] Current manufacturer Specifications table 1, row 3; CPU. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Cores / threads | 4 / 8[1][20] |
| Clock | 2.2 GHz[1][20] |
| Architecture | 64-bit[1][20] |
| Factory memory | 4 GB DDR4 ECC SODIMM[9][20] Current manufacturer Specifications table 1, row 11; Memory. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Official maximum / upgrade | 32 GB (2 × 16GB); 2 slots, matching modules required[1][20] |
Drives, capacity and expansion
SATA, M.2 and external expansion have different compatibility requirements.
| SATA bays | 4 × 3.5-inch SATA HDD or 2.5-inch SATA SSD[1][20] |
|---|---|
| Drive installation | Hot-swappable SATA trays; M.2 is not hot-swappable[1][20] |
| M.2 slots | 2 × M.2 2280 NVMe; cache or storage pools[1][20] Synology-verified SSDs required for supported storage pools; consult exact compatible model list. |
| Expansion | 1 × USB Type-C expansion port; DX525 adds 5 bays, total 9[1][20] DX525 sold separately. DX517 is not the listed compatible expansion unit. |
| RAID | SHR, Basic, JBOD, RAID 0, 1, 5, 6, 10[1][20] |
| Volume limits | 108 TB with stock RAM; 200 TB requires ≥32GB; 32 internal volumes[1][20] Software maxima depend on disks, available bays and RAID. Not usable capacity supplied with enclosure. |
| Internal filesystems | Btrfs, ext4[1][20] |
| External filesystems | Btrfs, ext4, ext3, FAT32, NTFS, HFS+, exFAT[1][20] |
| DSM 7.3 drive policy | Third-party SATA flexibility; M.2 pools/cache remain compatibility-listed[2] Third-party drives do not void NAS warranty, but technical support excludes faults directly caused by those drives. |
Network and connections
Two 2.5GbE ports need a suitable client and network mode to speed up one transfer.
| Ethernet | 2 × 2.5GbE[1][20] |
|---|---|
| USB | 2 × USB 3.2 Gen 1 Type-A (5 Gb/s)[1][20] |
| Protocols | SMB, AFP, NFS, FTP, WebDAV, Rsync[1][20] |
| 10GbE upgrade | No network upgrade slot[3][1][20] The dual 2.5GbE ports cannot be replaced by the DS923+ 10GbE module. |
Backups, photos and other apps
Read each software guideline with its memory, storage and licensing conditions.
| Backup | Hyper Backup folder and package backup; Snapshot Replication[1][20] |
|---|---|
| Surveillance licenses | 2 included; additional camera licenses sold separately[1][20] |
| Synology Drive guideline | 80 users; 500,000 indexed/hosted files[1][20] Maximum supported RAM, SSD volume where supported; Btrfs/unencrypted shares; 20% active/80% idle users. Not a stock-4GB workload guarantee. |
| Virtual Machine Manager | Guideline: 8 VMs / 8 Virtual DSM, including 1 Virtual DSM license[1][20] Depends on system configuration and memory; additional Virtual DSM licenses required. |
| Synology Photos | Facial and object recognition[1][20] |
| MailPlus | 5 free accounts; additional accounts need licenses[1][20] 90-user guideline uses maximum memory and specified mailbox workload; not a promise for stock 4GB. |
| AI de-identification | Requires ≥8GB and Container Manager[1][20] Not available with the supplied 4GB solely by installing the package. |
| Surveillance H.264 ceiling | 1080p: 40 channels / 1050 FPS; 4K: 20 / 200 FPS[1][20] Fully populated storage, factory RAM, continuous RTSP recording; other work/SRTP reduce capacity. |
| Hyper Backup | Folder/package and entire-system backup[1][20] |
Size, noise and power
Rated power and reviewer measurements use different drive and workload conditions.
| Dimensions (H × W × D) | 166 mm × 199 mm × 223 mm[9][20] Current manufacturer Specifications table 1, row 27; Appearance. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Weight (enclosure) | 2.26 kg[9][20] Current manufacturer Specifications table 1, row 28; Appearance. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Fans | 92 mm × 92 mm × 2 pcs[9][20] Current manufacturer Specifications table 1, row 30; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| AC input | 100V to 240V AC[9][20] Current manufacturer Specifications table 1, row 38; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Manufacturer power rating | 37.91 watts (Access) 12.33 watts (HDD Hibernation)[9][20] Current manufacturer Specifications table 1, row 40; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Manufacturer idle noise | 20.5 dB(A)[9][20] Current manufacturer Specifications table 1, row 34; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Power management | Scheduled on/off; Wake on LAN/WAN; automatic power recovery[1][20] |
| Adapter specification | 100 W / 120 W variants listed on current official page[1][20] The live specification lists both; delivered adapter variant not confirmed. 100W-only older merchant tables are not treated as definitive. |
Warranty, box contents and operating conditions
Drives, expansion hardware and optional licenses add to the enclosure cost.
| Operating temperature | 0–40 °C[1][20] |
|---|---|
| Storage temperature | −20–60 °C[1][20] |
| Humidity | Operating 8–80% RH; storage 5–95% RH[1][20] |
| Certifications | FCC, CE, BSMI, VCCI, RCM, UKCA, EAC, CCC, KC, BIS; RoHS[1][20] |
| Standard hardware warranty | 3 years[1][20] |
| Optional extension | 2 additional years via Extended Warranty Plus[1][20] Paid option in eligible North American/European markets; eligibility and purchase timing apply. |
| In the box | NAS, adapter, power cord, 2 LAN cables, accessory pack[1][20] |
Official hardware — CPU
Complete current manufacturer values and test conditions.
| CPU Quantity | 1[9][20] Current manufacturer Specifications table 1, row 4; CPU. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| CPU Cores | 4[9][20] Current manufacturer Specifications table 1, row 5; CPU. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| CPU Threads | 8[9][20] Current manufacturer Specifications table 1, row 6; CPU. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| CPU Architecture | 64-bit[9][20] Current manufacturer Specifications table 1, row 7; CPU. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| CPU Frequency | 2.2 GHz[9][20] Current manufacturer Specifications table 1, row 8; CPU. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Hardware Encryption Engine | Supported[9][20] Current manufacturer Specifications table 1, row 9; CPU. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official hardware — Memory
Complete current manufacturer values and test conditions.
| Memory Module Pre-installed | 4 GB (4 GB × 1)[9][20] Current manufacturer Specifications table 1, row 12; Memory. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Total Memory Slots | 2[9][20] Current manufacturer Specifications table 1, row 13; Memory. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Maximum Memory Capacity | 32 GB (16 GB × 2)[9][20] Current manufacturer Specifications table 1, row 14; Memory. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Memory — conditions and limits | Synology may revise pre-installed memory module specifications in response to component lifecycle and supply conditions. All revised components undergo the same rigorous validation to ensure equivalent compatibility, stability, and 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. For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.[9][20] Current manufacturer Specifications table 1, row 15; Memory. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official hardware — Storage
Complete current manufacturer values and test conditions.
| Drive Bays | 4 × 3.5" SATA HDD or 2.5" SATA SSD 2 × M.2 2280 NVMe SSD[9][20] Current manufacturer Specifications table 1, row 17; Storage. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Maximum Drive Bays with Expansion Unit | 9 (DX525 × 1)[9][20] Current manufacturer Specifications table 1, row 18; Storage. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Hot Swappable Drive* | Supported[9][20] Current manufacturer Specifications table 1, row 19; Storage. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Storage — conditions and limits | The hot swappable drive feature is not supported by M.2 SSD slots. Synology only guarantees full functionality, reliability, and performance for compatible drives. Please consult our compatibility list before purchasing hard drives. For more details, please refer to this article . SSD cache can be enabled with select compatible SSD. See the compatibility list for model-specific support and details. SSDs are sold separately.[9][20] Current manufacturer Specifications table 1, row 20; Storage. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official hardware — External Ports
Complete current manufacturer values and test conditions.
| RJ-45 2.5GbE LAN Port | 2[9][20] Current manufacturer Specifications table 1, row 22; External Ports. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| USB 3.2 Gen 1 Port | 2[9][20] Current manufacturer Specifications table 1, row 23; External Ports. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Expansion Port | 1[9][20] Current manufacturer Specifications table 1, row 24; External Ports. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Expansion Port Type | USB Type-C[9][20] Current manufacturer Specifications table 1, row 25; External Ports. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official hardware — Others
Complete current manufacturer values and test conditions.
| Fan Speed Mode | Full-Speed Mode Cool Mode Quiet Mode[9][20] Current manufacturer Specifications table 1, row 31; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Brightness Adjustable Front LED Indicators | Supported[9][20] Current manufacturer Specifications table 1, row 32; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Power Recovery | Supported[9][20] Current manufacturer Specifications table 1, row 33; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Scheduled Power On / Off | Supported[9][20] Current manufacturer Specifications table 1, row 35; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Wake on LAN / WAN | Supported[9][20] Current manufacturer Specifications table 1, row 36; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Power Supply Unit / Adapter | 100 watts 120 watts*[9][20] Current manufacturer Specifications table 1, row 37; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Power Frequency | 50/60 Hz, Single Phase[9][20] Current manufacturer Specifications table 1, row 39; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| British Thermal Unit | 129.27 BTU/hr (Access) 42.05 BTU/hr (HDD Hibernation)[9][20] Current manufacturer Specifications table 1, row 41; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Others — conditions and limits | For more information on how power consumption is measured, refer to this article . Noise testing was conducted with the Synology system fully installed with Synology SATA HDDs and in an idle state. Two GRAS 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%[9][20] Current manufacturer Specifications table 1, row 42; Others. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official hardware — Temperature
Complete current manufacturer values and test conditions.
| Operating Temperature | 0°C to 40°C (32°F to 104°F)[9][20] Current manufacturer Specifications table 1, row 44; Temperature. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Storage Temperature | -20°C to 60°C (-5°F to 140°F)[9][20] Current manufacturer Specifications table 1, row 45; Temperature. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. Manufacturer Fahrenheit value conflicts with -20°C (which equals -4°F); retain Celsius for planning. |
| Operating Humidity | 8% to 80% RH[9][20] Current manufacturer Specifications table 1, row 46; Temperature. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Storage Humidity | 5% to 95% RH[9][20] Current manufacturer Specifications table 1, row 47; Temperature. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official hardware — Certification
Complete current manufacturer values and test conditions.
| Certification | FCC CE BSMI VCCI RCM UKCA EAC CCC KC BIS[9][20] Current manufacturer Specifications table 1, row 49; Certification. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|
Official hardware — Warranty
Complete current manufacturer values and test conditions.
| Warranty | 3-year hardware warranty, extendable to 5 years with Extended Warranty Plus[9][20] Current manufacturer Specifications table 1, row 51; Warranty. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Warranty — conditions and limits | The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more) Extended Warranty Plus is only available in Europe and North America. Refer to the Extended Warranty Plus website for details on supported countries/regions. ( Learn more )[9][20] Current manufacturer Specifications table 1, row 52; Warranty. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official hardware — Environment
Official hardware — Packaging Content
Complete current manufacturer values and test conditions.
| Packaging Content | Main Unit × 1 Accessory Pack × 1 AC Power Adapter × 1 AC Power Cord × 1 RJ-45 LAN Cable × 2[9][20] Current manufacturer Specifications table 1, row 56; Packaging Content. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|
Official hardware — Optional Accessories
Complete current manufacturer values and test conditions.
| Optional Accessories | DDR4 ECC SODIMM: D4ES04-4G / D4ES03-8G / D4ES03-16G Expansion Units: DX525 Enterprise Series 3.5" SATA HDD: HAT5300 Series Plus Series 3.5" SATA HDD: HAT3300 Series Enterprise Series 2.5" SATA SSD: SAT5200 Series Enterprise Series M.2 2280 NVMe SSD: SNV3400 & SNV5400 Series[9][20] Current manufacturer Specifications table 1, row 58; Optional Accessories. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Optional Accessories — conditions and limits | For multi-module memory configurations, all modules must be identical and share the same model number. Check the Product Manual of your Synology product for recommended memory configurations.[9][20] Current manufacturer Specifications table 1, row 59; Optional Accessories. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Storage Management
Complete current manufacturer values and test conditions.
| Maximum Single Volume Size | 200 TB (32 GB memory required) 108 TB[9][20] Current manufacturer Specifications table 2, row 3; Storage Management. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Maximum Internal Volume Number | 32[9][20] Current manufacturer Specifications table 2, row 4; Storage Management. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| M.2 SSD Storage Pool Support* | Supported[9][20] Current manufacturer Specifications table 2, row 5; Storage Management. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| SSD Read/Write Cache (Determining cache size) | Supported[9][20] Current manufacturer Specifications table 2, row 6; Storage Management. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| SSD TRIM | Supported[9][20] Current manufacturer Specifications table 2, row 7; Storage Management. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Storage Efficiency | Supported[9][20] Current manufacturer Specifications table 2, row 8; Storage Management. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Supported RAID Type | Synology Hybrid RAID Basic JBOD RAID 0 RAID 1 RAID 5 RAID 6 RAID 10[9][20] Current manufacturer Specifications table 2, row 9; Storage Management. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| RAID Migration | Basic to RAID 1 Basic to RAID 5 RAID 1 to RAID 5 RAID 5 to RAID 6[9][20] Current manufacturer Specifications table 2, row 10; Storage Management. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Volume Expansion with Larger HDDs | Synology Hybrid RAID RAID 1 RAID 5 RAID 6 RAID 10[9][20] Current manufacturer Specifications table 2, row 11; Storage Management. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Volume Expansion by Adding a HDD | Synology Hybrid RAID JBOD RAID 5 RAID 6 (with Expansion Unit)[9][20] Current manufacturer Specifications table 2, row 12; Storage Management. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Global Hot Spare Supported RAID Type | Synology Hybrid RAID RAID 1 RAID 5 RAID 6 (with Expansion Unit) RAID 10 (with Expansion Unit)[9][20] Current manufacturer Specifications table 2, row 13; Storage Management. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Storage Management — conditions and limits | Volumes over 108 TB require 32 GB of memory or more. Actual maximum storage pool and volume sizes vary depending on drives used, the number of drive bays available, and the RAID configuration. 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. Creating M.2 storage pools requires the use of Synology-verified SSDs, which are rigorously tested under extreme temperature conditions. Thermal parameters for SSDs and NAS units are fine-tuned to ensure optimal management of thermal conditions under I/O-intensive environments. ( Learn more ) Storage efficiency helps reduce storage space consumption through deduplication and compression. For more information about this feature and its support requirements, please refer to this article .[9][20] Current manufacturer Specifications table 2, row 14; Storage Management. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — File System
Complete current manufacturer values and test conditions.
| Internal Drives | Btrfs ext4[9][20] Current manufacturer Specifications table 2, row 16; File System. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| External Drives | Btrfs ext4 ext3 FAT32 NTFS HFS+ exFAT[9][20] Current manufacturer Specifications table 2, row 17; File System. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — File Services
Complete current manufacturer values and test conditions.
| File Protocol | SMB AFP NFS FTP WebDAV Rsync[9][20] Current manufacturer Specifications table 2, row 19; File Services. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Maximum Number of SMB Connections (FSCT-Based) | 40[9][20] Current manufacturer Specifications table 2, row 20; File Services. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. Read the conditions in this group: expanded RAM, SSD volumes and partly idle simulated users may be used. |
| Windows Access Control List (ACL) Integration | Supported[9][20] Current manufacturer Specifications table 2, row 21; File Services. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| NFS Kerberos Authentication | Supported[9][20] Current manufacturer Specifications table 2, row 22; File Services. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| File Services — conditions and limits | Connection value of this model is tested with Synology SATA HDD fully populated and all onboard network ports Models with expandable memory are tested with the maximum supported quantity installed. SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration: Test workload: HomeFolder scenario provided by the FSCT tool Test duration: 600 seconds Domain controller & FSCT controller: Windows Server 2022 FSCT clients: 8 × Windows 10 machines SMB feature: Directory leasing enabled[9][20] Current manufacturer Specifications table 2, row 23; File Services. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Account & Shared Folder
Complete current manufacturer values and test conditions.
| Maximum Local User Accounts | 512[9][20] Current manufacturer Specifications table 2, row 25; Account & Shared Folder. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Maximum Local Groups | 128[9][20] Current manufacturer Specifications table 2, row 26; Account & Shared Folder. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Maximum Shared Folder | 128[9][20] Current manufacturer Specifications table 2, row 27; Account & Shared Folder. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Maximum Shared Folder Sync Tasks | 4[9][20] Current manufacturer Specifications table 2, row 28; Account & Shared Folder. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Hybrid Share
Official DSM — Hyper Backup
Complete current manufacturer values and test conditions.
| Folder and Package Backup | Supported[9][20] Current manufacturer Specifications table 2, row 32; Hyper Backup. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Entire System Backup | Supported[9][20] Current manufacturer Specifications table 2, row 33; Hyper Backup. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — High Availability
Official DSM — Log Center
Complete current manufacturer values and test conditions.
| Syslog Events per Second | 800[9][20] Current manufacturer Specifications table 2, row 37; Log Center. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. Read the conditions in this group: expanded RAM, SSD volumes and partly idle simulated users may be used. |
|---|
Official DSM — Virtualization
Complete current manufacturer values and test conditions.
| VMware vSphere | ESXi 8.0 U2, ESXi 8.0 U1, ESXi 8.0, ESXi 7.0 U3, ESXi 7.0 U2, ESXi 7.0 U1, ESXi 7.0, ESXi 6.7 U3, ESXi 6.7 U2, ESXi 6.7 U1, ESXi 6.7, ESXi 6.5 U3, ESXi 6.5 U2, ESXi 6.5 U1, ESXi 6.5[9][20] Current manufacturer Specifications table 2, row 39; Virtualization. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Microsoft Hyper-V | Windows Server 2025, Windows Server 2022[9][20] Current manufacturer Specifications table 2, row 40; Virtualization. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Citrix XenServer | XenServer 8.4, XenServer 8, Citrix Hypervisor 8.2 LTSR CU1[9][20] Current manufacturer Specifications table 2, row 41; Virtualization. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| OpenStack | Cinder[9][20] Current manufacturer Specifications table 2, row 42; Virtualization. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — General Specifications
Complete current manufacturer values and test conditions.
| Supported Protocols | SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV[9][20] Current manufacturer Specifications table 2, row 44; General Specifications. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Supported Browsers | Chrome Firefox Edge Safari[9][20] Current manufacturer Specifications table 2, row 45; General Specifications. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Supported Language | English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文[9][20] Current manufacturer Specifications table 2, row 46; General Specifications. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| General Specifications — conditions and limits | For an updated list of supported browser versions, check the DSM Technical Specifications .[9][20] Current manufacturer Specifications table 2, row 47; General Specifications. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Central Management System
Complete current manufacturer values and test conditions.
| Central Management System | Supported[9][20] Current manufacturer Specifications table 2, row 50; Central Management System. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|
Official DSM — Synology AI Console
Complete current manufacturer values and test conditions.
| Third-Party AI Model Integration | Supported[9][20] Current manufacturer Specifications table 2, row 52; Synology AI Console. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Maximum De-Identification Rate | 40 words per second[9][20] Current manufacturer Specifications table 2, row 53; Synology AI Console. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Synology AI Console — conditions and limits | De-identification performance measurement: Filters for Credit Card Numbers, IBAN, Individual Taxpayer Identification Number, SSN, and Names applied to a 4,355-word English text. To enable de-identification, your device must have at least 8 GB of memory and Container Manager installed.[9][20] Current manufacturer Specifications table 2, row 54; Synology AI Console. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Synology Chat
Complete current manufacturer values and test conditions.
| Maximum Number of Users | 150[9][20] Current manufacturer Specifications table 2, row 56; Synology Chat. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. Read the conditions in this group: expanded RAM, SSD volumes and partly idle simulated users may be used. |
|---|---|
| Synology Chat — conditions and limits | 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. Models with expandable memory are tested with the maximum supported quantity installed.[9][20] Current manufacturer Specifications table 2, row 57; Synology Chat. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Download Station
Official DSM — SAN Manager
Complete current manufacturer values and test conditions.
| Maximum iSCSI Target Number | 32[9][20] Current manufacturer Specifications table 2, row 61; SAN Manager. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Maximum LUN | 64[9][20] Current manufacturer Specifications table 2, row 62; SAN Manager. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| LUN Clone/Snapshot, Windows ODX | Supported[9][20] Current manufacturer Specifications table 2, row 63; SAN Manager. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Synology MailPlus / MailPlus Server
Complete current manufacturer values and test conditions.
| Free Email Accounts | 5 (Additional accounts require purchase of licenses)[9][20] Current manufacturer Specifications table 2, row 65; Synology MailPlus / MailPlus Server. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Maximum Number of Users | 90[9][20] Current manufacturer Specifications table 2, row 66; Synology MailPlus / MailPlus Server. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. Read the conditions in this group: expanded RAM, SSD volumes and partly idle simulated users may be used. |
| Synology MailPlus / MailPlus Server — conditions and limits | The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more Models with SSD support are tested with a single SSD volume. Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements . Operating in high-availability mode will incur additional overhead. Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).[9][20] Current manufacturer Specifications table 2, row 67; Synology MailPlus / MailPlus Server. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Media Server
Official DSM — Synology Photos
Complete current manufacturer values and test conditions.
| Facial Recognition | Supported[9][20] Current manufacturer Specifications table 2, row 71; Synology Photos. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Object Recognition | Supported[9][20] Current manufacturer Specifications table 2, row 72; Synology Photos. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Snapshot Replication
Complete current manufacturer values and test conditions.
| Maximum Snapshots per Shared Folder | 256[9][20] Current manufacturer Specifications table 2, row 74; Snapshot Replication. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Maximum Snapshots per LUN | 32[9][20] Current manufacturer Specifications table 2, row 75; Snapshot Replication. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Maximum Snapshots per System | 2,048[9][20] Current manufacturer Specifications table 2, row 76; Snapshot Replication. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Maximum Replication Tasks for Shared Folders | 32[9][20] Current manufacturer Specifications table 2, row 77; Snapshot Replication. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Maximum Replication Tasks for LUNs | 16[9][20] Current manufacturer Specifications table 2, row 78; Snapshot Replication. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Maximum Replication Tasks per System | 32[9][20] Current manufacturer Specifications table 2, row 79; Snapshot Replication. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Surveillance Station
Complete current manufacturer values and test conditions.
| Default Licenses | 2 (Additional cameras require purchase of licenses)[9][20] Current manufacturer Specifications table 2, row 81; Surveillance Station. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
|---|---|
| Maximum IP Cameras and Total FPS (H.264) | 1080p: 40 channels, 1050 FPS 3M: 40 channels, 600 FPS 5M: 30 channels, 360 FPS 4K: 20 channels, 200 FPS[9][20] Current manufacturer Specifications table 2, row 82; Surveillance Station. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Maximum IP Cameras and Total FPS (H.265) | 1080p: 40 channels, 1200 FPS 3M: 40 channels, 1000 FPS 5M: 40 channels, 600 FPS 4K: 30 channels, 300 FPS[9][20] Current manufacturer Specifications table 2, row 83; Surveillance Station. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Surveillance Station — conditions and limits | Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads. Use NVR Selector to quickly find a suitable model based on your requirements. The number of video channels that can be viewed simultaneously is double the maximum number of cameras for the same codec and resolution. The values above are based on testing with RTSP streaming. If SRTP is enabled for all cameras, overall performance will decrease to 70% of the stated figures.[9][20] Current manufacturer Specifications table 2, row 84; Surveillance Station. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Synology Drive
Complete current manufacturer values and test conditions.
| Maximum Number of Users | 80[9][20] Current manufacturer Specifications table 2, row 86; Synology Drive. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. Read the conditions in this group: expanded RAM, SSD volumes and partly idle simulated users may be used. |
|---|---|
| Maximum 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)[9][20] Current manufacturer Specifications table 2, row 87; Synology Drive. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
| Synology Drive — conditions and limits | The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more Models with SSD support are tested with a single SSD volume. Models with expandable memory are tested with the maximum supported quantity installed. Exceeding the recommended numbers above will not block application operations, but may result in longer response time. Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.[9][20] Current manufacturer Specifications table 2, row 88; Synology Drive. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Synology Office
Complete current manufacturer values and test conditions.
| Maximum Number of Users | 80[9][20] Current manufacturer Specifications table 2, row 90; Synology Office. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. Read the conditions in this group: expanded RAM, SSD volumes and partly idle simulated users may be used. |
|---|---|
| Synology Office — conditions and limits | The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more Models with SSD support are tested with a single SSD volume. Models with expandable memory are tested with the maximum supported quantity installed. Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM[9][20] Current manufacturer Specifications table 2, row 91; Synology Office. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — Virtual Machine Manager
Complete current manufacturer values and test conditions.
| Recommended Virtual Machine Instances | 8 (Learn more)[9][20] Current manufacturer Specifications table 2, row 93; Virtual Machine Manager. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. Read the conditions in this group: expanded RAM, SSD volumes and partly idle simulated users may be used. |
|---|---|
| Recommended Virtual DSM Number (Licenses required) | 8 (including 1 Free License)[9][20] Current manufacturer Specifications table 2, row 94; Virtual Machine Manager. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. Read the conditions in this group: expanded RAM, SSD volumes and partly idle simulated users may be used. |
| Virtual Machine Manager — conditions and limits | The specifications vary depending on system configuration and memory size.[9][20] Current manufacturer Specifications table 2, row 95; Virtual Machine Manager. Numbers are manufacturer ratings/guidelines, not ChooseCompute test results. |
Official DSM — VPN Server
Exact product identity & open questions
- Independent ownership and reliability: Public-source research; ChooseCompute has not tested this NAS.
- Expansion-unit performance: Selected authors did not test DX525.
- Memory and firmware test matrix: No controlled stock-4 GB versus expanded-RAM comparison. Dong’s current DSM 7.3 retest and Neowin’s DSM 7.3.1 setup were independently re-read; earlier launch tests remain dated.
- Adapter variant: Official page lists 100 W and 120 W adapters. XDA’s 90 W note is a conflict and is not adopted. Shipped US carton still unknown.
- Additional US merchants: B&H, Best Buy, Adorama blocked. Amazon interstitial. Historical B&H/Amazon rows keep original checkedAt.
- Manufacturer application test conditions: Published SMB/Drive/Office/VM figures use different workloads and may assume max RAM or SSD volumes.
- Video frames and original audio: Complete auto-captions for CSz5aOcJVtc and b9IvT9uviyk were read. NASCompares article-embedded test stills were also viewed. Neither full original video nor audio was reviewed; SpaceRex frames remain unverified.
Sources
Research updated Sep 11, 2026. Individual source check dates are listed below. Measurements belong to the named reviewers; tested configurations and software versions may differ from the product you buy.
- [1] Synology DS925+ product specifications ↗
Checked Sep 11, 2026 · Hardware + DSM
- [2] DSM 7.3 drive compatibility FAQ ↗
Checked Sep 11, 2026 · FAQ 2
- [3] Dong Knows Tech DS925+ review ↗
Checked Sep 11, 2026 · Baseline DSM 7.3 retest retained; live 403 this round
- [4] TechRadar DS925+ review ↗
Checked Sep 11, 2026 · 280/282 MB/s single 2.5GbE; ALB 168 MB/s
- [5] Frandroid DS925+ test ↗
Checked Sep 11, 2026 · SMB multichannel ~550 MB/s write NVMe; Plex CPU transcode
- [6] Macworld DS925+ review ↗
Checked Sep 11, 2026 · Setup friction only
- [7] B&H DS925+ enclosure-only product page ↗
Checked Sep 8, 2026 · MFR number, factory RAM, main new-product buy box, In Stock, price and shipping
- [8] Newegg DS925+ diskless product page ↗
Checked Sep 11, 2026 · N82E16822108847; title DS925+ diskless 4 GB ECC; slug still says J4125; $889.99 Sold by Newegg
- [9] Synology DS925+ product page reread ↗
Checked Sep 11, 2026 · V1500B; 4 GB ECC / 32 GB; dual 2.5GbE; 100/120 W; 20.5 dB(A)
- [10] Amazon — DS925+ ↗
Checked Sep 10, 2026 · Selected buy-box seller; Product information model; New offers. MAP-hidden main price is not inferred from other sellers or recommendations.
- [11] Newegg — DS925+ ↗
Checked Sep 11, 2026 · N82E16822108847; title DS925+ diskless 4 GB ECC; slug still says J4125; $889.99 Sold by Newegg
- [12] Synology DS925+ datasheet ↗
Checked Sep 11, 2026 · Aug 01, 2025; 522/565 MB/s sequential claim
- [13] NASCompares DS925+ review ↗
Checked Sep 11, 2026 · Wayback article + parent ASR CSz5aOcJVtc
- [14] XDA DS925+ review ↗
Checked Sep 11, 2026 · Qualitative DSM/Plex; 90 W not adopted
- [15] Tech ARP DS925+ performance review ↗
Checked Sep 11, 2026 · RAID 10 HAT3300-4T 2.5GbE copies
- [16] Android Central DS925+ review ↗
Checked Sep 11, 2026 · Launch-era Plex/direct-play
- [17] SpaceRex DS925+ review video ↗
Checked Sep 11, 2026 · Parent ASR only; RAID1 ~200 MB/s; NVMe ~300 MB/s
- [18] Synology DS925+ im Test: Das gute Upgrade mit 2,5 GbE steht im HDD-Kreuzfeuer ↗
Checked Sep 11, 2026 · Complete original article and target-model charts independently read by parent; captures and hashes in source audit.
- [19] Synology DS925+ review: A look after backtracking on locking out unapproved drives ↗
Checked Sep 11, 2026 · Complete original article and target-model charts independently read by parent; captures and hashes in source audit.
- [20] DS925+ current official product specification ↗
Checked Sep 11, 2026 · All hardware/software tables and footnotes; PDF generated 2026-08-06, independently read.
Research and review record
- Research: Grok 4.6 · Source research and data update
- Self-check: Grok 4.6 · Researcher self-check
- Independent review: GPT-6 (Codex) · Independent full available original articles, current official product-spec PDFs and recorded chart review. Cross-model screenshots, cache states, power/noise methods and source attribution reconciled. Newegg buyboxes rechecked; other merchant dates preserved. Full original video/audio not reviewed.
- Editorial integration: GPT-6 (Codex) · Editorial integration and validation
Independent review completed for the scope recorded in the audit.
Source evidence and review history (JSON)