Synology DS925+ Review: Is This 4-Bay NAS Still Worth It in 2026?

The DS925+ uses the same AMD Ryzen V1500B processor found in the 2022 DS923+ and the 2021 DS1621+, while UGREEN's DXP4800 Plus ships a 12th-generation Intel chip with built-in 10GbE for $40 less. That hardware gap is real.

After deploying dozens of Synology NAS systems for South Florida businesses over 20 years, we've consistently found that for teams depending on their NAS for daily operations, software reliability and ecosystem depth matter more than benchmark scores. DSM 7.3, Active Backup for Business, and Synology's support track record are not easily replicated by newer platforms.

This review covers the DS925+ specs, real-world performance, cost comparisons against cloud storage and competing NAS units, and where the hardware limitations actually matter.

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Who Should Buy the Synology DS925+?

The Synology DS925+ is built for small businesses of 10 to 30 users that need centralized file sharing, automated backups, and RAID 5/6 data redundancy.

It is the natural upgrade path for teams already within the Synology ecosystem moving from a 2-bay unit to a 4-bay system. Organizations relying on Active Directory integrations, teams running Synology's Active Backup for Business across multiple endpoints, or businesses looking to run on-premises AI models through the DSM AI Console will find the DS925+ a practical choice. Existing drives and DSM configurations from a DS720+ or DS923+ migrate cleanly.

Best for:

• Teams of 10-30 users needing centralized file sharing, backup, and surveillance storage
• Businesses implementing RAID 5 or RAID 6 for data redundancy (requires 3+ drives)
• Organizations in the Synology ecosystem expanding from a 2-bay unit
• IT administrators who want a polished, well-documented platform with strong mobile apps
• Businesses with data privacy requirements that benefit from local AI processing via the AI Console

Not the right fit for:

• Teams requiring 10GbE networking — the DS925+ has no PCIe slot; consider the UGREEN DXP4800 Plus or DS1823xs+
• Heavy Plex or media server users — the AMD V1500B has no Intel Quick Sync for hardware transcoding
• CPU-intensive workloads like running multiple VMs or intensive Docker containers
• Buyers prioritizing hardware value over software ecosystem — the QNAP TS-464 or UGREEN DXP4800 Plus deliver better specs per dollar

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Synology DS925+ Hardware Specifications

The DS925+ features an AMD Ryzen V1500B quad-core processor, 4GB of DDR4 ECC memory, four hot-swappable drive bays, and dual 2.5GbE network ports with link aggregation support.

It accommodates up to 32GB of RAM and scales to nine total drive bays using the DX525 expansion unit. Two M.2 NVMe slots support caching and Synology Tiering.

Full Specifications

What Changed from the DS923+

The DS925+ is not a straightforward upgrade from its predecessor. There is one significant improvement and one significant regression worth understanding before buying.

The upgrade: dual 2.5GbE networking. The DS923+ used a single 1GbE port with an optional 10GbE PCIe expansion card. The DS925+ ships with two 2.5GbE ports capable of link aggregation, providing up to 5Gbps combined bandwidth with a compatible switch — no card required.

The regression: no PCIe expansion slot. Synology removed the PCIe slot entirely. The DS923+ could be upgraded to 10GbE with a $200 expansion card; the DS925+ cannot be upgraded at all. If your network will grow to 10GbE within the next 2-3 years, this is a meaningful limitation.

What stayed the same: The processor is identical — the AMD Ryzen V1500B, first introduced in 2018, has been used across every Plus and xs+ model since 2021 without change.

Setup and installation: Drive installation is tool-less. The DS925+ uses screwless trays that accept 3.5-inch HDDs without any tools. Initial DSM 7.3 setup runs 10-15 minutes through the web-based wizard — accessible for business owners without IT staff.

RAM upgrade: Both SODIMM slots are accessible from the drive bay area after removing the drives, making RAM upgrades straightforward without disassembling the chassis. Note that installing non-Synology RAM will trigger an "unverified memory" notification in DSM — the same cosmetic warning that appears with third-party hard drives. This does not affect functionality; the RAM operates normally.

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How Much Does the Synology DS925+ Cost?

The diskless Synology DS925+ costs $639.99. A fully populated four-bay system using 8TB NAS drives costs approximately $1,240.

At $160 per bay, this is significantly better value than the DS725+'s $260 per bay — but only makes economic sense if you plan to fill at least three bays within the first 12-18 months. Check current DS925+ pricing here.

Complete Pricing Breakdown (March 2026)

Diskless unit: $639.99 (Amazon, B&H Photo, Newegg)

Realistic configurations:

Expansion costs:

• DX525 expansion unit: $635 (adds 5 bays)
• Total 9-bay system: $1,275 diskless (DS925+ + DX525)

DS925+ vs DS1823xs+: When the Upgrade Justifies the Cost

The DS1823xs+ justifies its ~$1,160 premium only if you need both 10GbE networking and significantly more bay capacity. For most teams under 30 users, the DS925+ paired with dual 2.5GbE link aggregation is sufficient. Video production workflows, intensive VM hosting, or teams already running 10GbE infrastructure are the primary cases where the DS1823xs+ earns its price.

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How Fast Is the Synology DS925+?

The DS925+ delivers sequential read speeds up to 522 MB/s and write speeds up to 565 MB/s when both 2.5GbE ports are configured for link aggregation. With a single 2.5GbE connection, the theoretical ceiling is 312 MB/s — still 2.5× faster than legacy 1GbE models.

In practical terms, a 10GB file transfers in under 20 seconds on a link-aggregated connection. A 100GB project folder completes in under 3 minutes.

Real-World Performance Benchmarks

• Large file transfers: 10GB file transfers in ~18 seconds (read) / ~20 seconds (write) with link aggregation
• RAID 5 write overhead: ~10-15% reduction in write speed vs RAID 1 — parity calculations are transparent in normal use
• Multi-user access: 15-25 concurrent users working with office documents without performance degradation
• 4K random read: 4,800 IOPS — adequate for light database workloads and active project files
• 4K random write: 4,200 IOPS

RAID 5 in practice: Write speeds with three drives in RAID 5 typically land at 450-480 MB/s on the DS925+ — below the 565 MB/s ceiling but more than sufficient for virtually any SMB workflow. The 4-core AMD V1500B handles parity calculations without visible impact on everyday file operations.

CPU headroom for simultaneous workloads: We ran the following concurrently during testing in a 12-user South Florida office deployment — Active Backup incremental backup, 8 users accessing shared drives, and Surveillance Station monitoring 6 cameras. CPU utilization peaked at 40-55% with no user-visible slowdowns. The 4-core V1500B provides meaningful headroom over the 2-core R1600 in the DS725+.

Compared to the UGREEN DXP4800 Plus: The UGREEN's Intel Pentium Gold 8505 delivers approximately 20-30% faster CPU performance in compute-intensive tasks like Plex transcoding and VM operations. For file sharing, backup, and standard NAS workloads, the difference is not perceptible in day-to-day use.

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DSM 7.3: The Software Advantage

The DS925+ runs the same DiskStation Manager 7.3 as Synology's DS1823xs+ (~$1,800). This software parity is Synology's clearest competitive advantage — there are no feature tiers based on hardware price.

Core DSM 7.3 features:

• Active Backup for Business: License-free backup for Windows PCs, Macs, Linux servers, and VMware/Hyper-V environments
• Synology Drive: Self-hosted file sync and team collaboration — a Dropbox alternative with full data control
• Synology Photos: AI-powered photo organization with facial recognition (useful for real estate, legal, and marketing teams)
• Surveillance Station: IP camera management up to 40 cameras (20-30 cameras is a comfortable operating range for the DS925+)
• C2 cloud integration: Hybrid backup to Synology's own cloud storage for offsite disaster recovery
• Docker support: Run containerized applications — the 4-core V1500B handles 8-12 containers comfortably
• Synology Tiering: Automatically moves frequently accessed "hot" data to M.2 NVMe and rarely accessed files to HDD storage

Synology Tiering: Getting the Most from the M.2 Slots

DSM 7.3's Synology Tiering makes the DS925+'s two M.2 NVMe slots genuinely useful for mixed-workload environments. The system monitors file access patterns and moves active project files to fast NVMe storage while automatically archiving older data to HDD — without any manual intervention.

For a 12-user accounting firm, this means the current year's client files remain on NVMe while prior-year archives migrate to HDD. Response times for active work stay fast; storage costs stay manageable.

To enable tiering, install any consumer M.2 NVMe drives in the NVMe slots. Note that Synology-approved models are required only for dedicated NVMe storage pools — tiering works with any NVMe drive.

Synology AI Console: On-Premises AI for Teams with Privacy Requirements

DSM 7.3 introduced the Synology AI Console, allowing businesses to run large language models (LLMs) locally on the NAS. For legal, medical, and financial services firms handling client data, this addresses a real gap: the ability to use AI-assisted document review without sending files to external cloud providers.

What the AI Console enables on the DS925+:

• Local LLM inference: Run open-source models (Llama, Mistral) entirely on-premises
• Full data privacy: No documents or queries leave the local network
• Custom data masking: Define sensitive fields — SSNs, account numbers, client names — that are automatically masked before any AI processing
• No subscription costs: Unlike cloud AI APIs, there are no per-query or monthly fees

The DS925+'s 4-core V1500B handles AI inference noticeably better than the 2-core R1600 in the DS725+. For small teams running occasional document summaries or internal knowledge base queries, performance is practical. For real-time AI assistance across 10+ concurrent users, response latency will be more noticeable — dedicated AI hardware will always outperform a general-purpose NAS CPU for inference workloads.

For businesses already evaluating on-premises AI solutions, the DS925+ provides a low-friction entry point that doesn't require a separate AI appliance.

Backup Performance

We tested Active Backup for Business with a 10-user office (mixed Windows 10/11 and macOS):

• Initial backup (1TB total): ~2 hours over link-aggregated 2.5GbE
• Daily incremental backups: 5-15 minutes for typical daily changes (10-30GB)
• Restore (100GB): ~12 minutes

Active Backup runs entirely license-free, covering unlimited Windows and macOS endpoints, VMware/Hyper-V VMs, and physical Linux servers. For growing teams adding endpoints over time, the zero-license model is a meaningful cost advantage over competing platforms.

For teams also using Google Workspace, Active Backup for Microsoft 365 and Google Workspace extends the same license-free model to cloud data — a capability that costs extra on most competing NAS platforms.

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DS925+ vs Cloud Storage: The 10-Month Break-Even

For teams evaluating whether local NAS storage makes financial sense, the break-even calculation for the DS925+ is compelling at the scale it's designed for.

Break-even analysis (10-user team, 4-drive RAID 5 config):

At $1,240 for 24TB usable RAID 5 storage, the DS925+ pays for itself in approximately 10 months compared to cloud subscription costs for a 10-person team.

3-year savings vs Google Workspace: ~$2,930

The NAS advantage compounds at team scale. A 15-user Google Workspace deployment runs $180/month — the DS925+ break-even falls to approximately 7 months. This is the core financial argument for NAS at the 10-30 person scale the DS925+ targets.

Additional advantages:

• Transfer speed: Local network speeds (522 MB/s with link aggregation) vs typical business internet upload speeds (25-100 MB/s)
• Data sovereignty: Files stay on-premises, subject to your retention policies and not third-party terms of service
• No bandwidth costs: 100GB file transfers don't consume internet bandwidth or trigger cloud egress fees

When cloud remains the better choice:

• Remote-first teams with no central office and users distributed across multiple cities
• Teams under 5 people with under 2TB of active storage needs
• Organizations that require geographic redundancy without managing any hardware

The practical approach for most businesses:

Use the DS925+ for fast local access, collaborative file sharing, and primary storage — combined with automated nightly backups to cold cloud storage (iDrive, Backblaze B2) for offsite disaster recovery. This hybrid approach delivers local performance and data privacy with offsite protection for under $100/year in cloud backup costs.

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DS925+ vs DS725+ vs UGREEN DXP4800 Plus vs DS1823xs+

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Synology DS925+ Alternatives: UGREEN DXP4800 Plus and QNAP TS-464 Compared

UGREEN DXP4800 Plus: Better Hardware, Less Mature Software

Price: ~$600

UGREEN's DXP4800 Plus is the most direct 4-bay competitor to the DS925+ in 2026. It ships better hardware at a lower price, and the comparison is genuinely close.

Hardware advantages over DS925+:

• Intel Pentium Gold 8505 (5-core, 12th-generation Alder Lake-N) — delivers 20-30% better CPU performance
• Built-in 10GbE port — no add-on card, no additional cost
• 8GB DDR5 standard (vs 4GB DDR4 ECC)
• HDMI 2.0 output for direct display connection
• PCIe Gen 3 slot for additional expansion cards

Software realities:

• UGOS PRO handles core NAS functions — file sharing, RAID, Docker, Plex — reliably
• The platform is newer (2023) with a narrower third-party app ecosystem than DSM's Package Center
• Documentation and community support are thinner than Synology's 15+ years of DSM resources
• Enterprise integrations (Active Directory, VMware, Hyper-V) are functional but less thoroughly tested at scale
• Mobile apps are improving but not yet at DSM's polish level

Our honest take: If you need 10GbE networking or a newer CPU for transcoding and Docker, the UGREEN DXP4800 Plus offers objectively better hardware value. If you have non-technical staff relying on the NAS, are migrating from another Synology unit, or need Active Backup for Business's specific backup architecture, the DS925+ provides a better-supported experience. The decision comes down to whether you're buying primarily for hardware specs or for software ecosystem depth.

For a deeper comparison of the UGREEN platform against Synology, see our UGREEN vs Synology NAS comparison.

QNAP TS-464: More Hardware Flexibility, More Complexity

Price: ~$520-560

The QNAP TS-464 is worth considering if 10GbE is a future requirement but budget doesn't support the UGREEN's built-in 10GbE upfront — the TS-464's PCIe slot accepts a 10GbE expansion card when needed.

Advantages over DS925+:

• Intel Celeron N5105 (4-core/4-thread, Jasper Lake) — better transcoding performance
• PCIe Gen 3 x2 slot — upgrade to 10GbE later for ~$100-200
• Dual 2.5GbE ports (same as DS925+)
• Lower starting price (~$80-120 less)
• 4× M.2 NVMe slots on some models

Trade-offs:

• QTS software is functional but meaningfully less polished than DSM — steeper learning curve for non-technical users
• Smaller community and documentation ecosystem
• Mobile apps and third-party integrations are less mature

Verdict: The QNAP TS-464 makes sense for technically capable users who want a future 10GbE upgrade path without paying for it today. For teams prioritizing ease of management, DSM remains the better daily-use experience.

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Expansion Path: Growing from 4 to 9 Bays

The DS925+ supports the same DX525 expansion unit as the DS725+, adding 5 bays via USB-C for a total of 9 bays and up to 180TB raw capacity.

DX525 Specifications

• Price: $635
• Bays: 5× 3.5"/2.5" SATA (hot-swappable)
• Connection: USB-C (USB 3.2 Gen 2, 10 Gbps)
• Power: External power supply included

Total System Costs

How the 9-bay config compares to a DS1823xs+ (8-bay):

• DS925+ + DX525 diskless: $1,275
• DS1823xs+ diskless: ~$1,800
• Difference: DS1823xs+ costs $525 more and provides one fewer bay — but includes 10GbE and a PCIe slot, which matter if your network infrastructure supports it.

Storage volume configuration with DX525:

Synology recommends keeping the NAS bays and DX525 bays on separate storage volumes rather than spanning a single volume across both units. This prevents data loss if the USB-C cable is accidentally disconnected. Both volumes remain accessible through DSM seamlessly, with the protection of independent redundancy.

When expansion makes sense:

• You're starting with a full 4-bay DS925+ and outgrowing capacity
• You want to expand incrementally rather than replacing the unit
• You're managing data archives separately from active working storage

When to buy an 8-bay unit upfront:

• You're confident you'll need 6+ bays within 18 months
• You need 10GbE or PCIe expansion (the DS1823xs+ is the natural 8-bay Synology with those features)

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Drive Compatibility: The October 2025 Policy Reversal

What Changed

In May 2025, Synology announced that new Plus series models — including the DS925+ — would require Synology-branded HAT drives for full functionality, effectively locking buyers into higher-cost proprietary storage. The announcement generated significant pushback from the NAS community, and Synology reversed the policy with the DSM 7.3 release in October 2025.

Current status (March 2026):

• All standard 3.5-inch HDDs work — WD Red Plus, Seagate IronWolf, Toshiba N300, and other mainstream NAS drives are fully supported
• All 2.5-inch SATA SSDs work — Samsung, Crucial, WD, and others
• Third-party drives display as "unverified" in DSM — this is a warning label, not a functional restriction
• M.2 NVMe restriction remains — only Synology-approved NVMe drives (SNV3410, SNV3510 series) are supported for dedicated storage pools; any NVMe drive works for caching and tiering

Recommended Drives for the DS925+

For a 4-bay system, drive selection has a direct impact on RAID performance and power consumption. NAS-rated drives are worth the modest premium over desktop alternatives for 24/7 workloads.

3.5-inch HDDs (for primary storage):

2.5-inch SSDs (for all-flash configurations):

M.2 NVMe (for caching and Synology Tiering):

Any consumer NVMe drive works for caching and tiering (Samsung 990 Pro, WD Black SN850, etc.). For dedicated NVMe storage pools, only Synology SNV3410/SNV3510 series drives are supported.

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What Are the Limitations of the DS925+?

The DS925+ handles standard NAS workloads reliably. The following limitations are worth understanding before buying, depending on your use case.

No 10GbE Upgrade Path

The removal of the PCIe expansion slot is the most significant regression from the DS923+. On the previous generation, a $200 PCIe card could bring 10GbE to the unit. On the DS925+, there is no upgrade path — 2.5GbE with link aggregation is the ceiling.

Who this affects:

• Businesses running 10GbE switches today
• Video production teams editing 4K/8K footage over the network
• Organizations planning infrastructure upgrades within 2-3 years

If 10GbE is a near-term requirement, the UGREEN DXP4800 Plus (built-in 10GbE) is the more practical purchase. If 10GbE and 8 bays are both needed, the DS1823xs+ is the path within the Synology ecosystem.

Processor Limitations: AMD V1500B

The V1500B handles the DS925+'s intended workloads competently. Where it falls short relative to current-generation processors is in compute-intensive tasks:

• Plex transcoding: No Intel Quick Sync means CPU-based software transcoding only — 2-4 simultaneous 1080p streams maximum before quality degrades
• VM performance: Running Windows Server or desktop VMs requires the full 4-core budget; the experience is slower than on a current-generation Intel CPU
• Docker at scale: 10+ containers consuming active CPU cycles can create contention under concurrent workloads

For file sharing, backup, and moderate Docker use, the V1500B is adequate. For heavier virtualization or media server workloads, the hardware is a real constraint.

M.2 NVMe Storage Pool Restriction

Standard M.2 NVMe drives from Samsung, WD, and others work without restriction for caching and Synology Tiering. For creating dedicated all-NVMe storage pools, only Synology SNV3410 and SNV3510 series drives are supported.

Synology's own NVMe drives carry a noticeable premium over comparable consumer drives. For tiering and caching purposes — which cover most business use cases — this restriction is not relevant. For all-flash storage pools, budget for Synology-branded NVMe.

One additional detail worth knowing: the DS925+'s M.2 slots are PCIe Gen 3. Installing a PCIe Gen 4 NVMe drive will work, but throughput is capped at Gen 3 speeds (approximately 3,500 MB/s sequential read). For caching and tiering workloads this makes no practical difference, but it rules out any performance advantage from high-end Gen 4 drives.

Power and Noise

The DS925+ with four drives consumes approximately 35W at idle and 50W under load. At $0.15/kWh, annual electricity costs run $46-66 per year. The DS925+ operates at 25-28 dB under normal load — roughly equivalent to a quiet desktop fan. It is audible in a silent room but not disruptive in a typical office environment. The older DS920+ ran at a comparable noise level; rack-mount NAS units typically operate at 35-45 dB and require a dedicated equipment room.

For reference, the DS725+ operates more quietly (18-24 dB) due to having only two drive bays. If the unit will sit on a desk in an open workspace, the DS725+ is the quieter option.

Annual energy cost comparison:

The UGREEN DXP4800 Plus draws less power due to its newer Intel N-series architecture and fewer spinning drives at typical configurations. The DS925+ draws more from both the additional drive bays and the older AMD architecture. The annual cost difference between the two units is approximately $13-15 — not a meaningful factor in a purchase decision, but worth accounting for in server closet deployments where heat and energy budgets matter.

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Final Verdict & Buying Guide

The Synology DS925+ earns its place on the strength of DSM 7.3, not its hardware. The AMD V1500B processor dates to 2018 and has not been updated in this product line, 10GbE was removed rather than added, and UGREEN ships better silicon for roughly the same price. These are genuine trade-offs worth understanding before buying.

What the DS925+ offers in return: 15+ years of DSM software maturity, Active Backup for Business with zero license costs, a well-documented ecosystem that non-technical staff can actually navigate, and expansion to 9 bays with a single add-on unit. A fully configured 24TB RAID 5 system at $1,240 breaks even against Google Workspace subscriptions in approximately 10 months. For teams that aren't running Plex or pushing 10GbE, the DS925+ delivers what it promises reliably.

Buy the DS925+ if:

• You're a 10-30 person team needing RAID 5/6, centralized file sharing, and automated backup
• You value DSM's software ecosystem — Active Backup for Business, Synology Drive, mature mobile apps, and 15+ years of community support
• 2.5GbE with link aggregation is sufficient — dual-port link aggregation covers nearly all SMB file workflows
• You're already in the Synology ecosystem — drive and configuration migration from a DS923+ or DS720+ is straightforward
• Data privacy requirements matter — the AI Console runs local LLMs without cloud exposure

Choose the UGREEN DXP4800 Plus instead if:

• You need 10GbE networking today or within 12 months
• Plex transcoding or VM performance is a priority — Intel Quick Sync is a meaningful advantage here
• Hardware value per dollar is the primary decision driver
• You're comfortable with a newer, less established platform

Choose the DS1823xs+ instead if:

• You need both 10GbE and 8 bays within the Synology ecosystem
• You're running 30+ users or multiple resource-intensive VMs simultaneously
• Budget supports the ~$1,160 premium over the DS925+

We earn a commission if you purchase through our affiliate links, at no additional cost to you. This supports our independent testing and content creation.

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Related Resources

• Synology DS725+ Review — The 2-bay option: when the DS725+ makes more sense than buying 4 bays you don't need yet.
• UGREEN vs Synology NAS — A detailed comparison of UGREEN's AI-focused NAS platform against Synology's enterprise lineup.
• Best NAS for Small Business 2026 — Side-by-side comparison of Synology DS925+, UGREEN DXP4800 Plus, and UniFi UNAS Pro.
• Synology Active Backup for Business Guide — Complete guide to license-free endpoint, server, and VM backup on Synology NAS.
• 321 Backup Rule Guide — How to implement the 3-2-1 backup strategy with local NAS and cloud storage.
• Synology NAS Review: Complete Guide — Broader Synology lineup coverage including DS925+, DS1825+, and DSM 7.3 feature analysis.