Synology 2-Bay DiskStation DS725+ (Diskless)
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AI Verdict
This 2-bay NAS with a 2.6 GHz AMD Ryzen R1600 CPU and 2.5GbE is for users prioritizing Synology's DSM software and 7-bay expansion over 10GbE speeds.
This NAS is a situational fit because its 2.5GbE port and 7-bay expansion capability offer scalability for growing storage needs, but the lack of a 10GbE upgrade path and the AMD R1600 CPU's limitations for media transcoding mean it won't suit performance-focused users. It's a strong choice if Synology's DSM software is a priority and 2.5GbE is sufficient for your network.
If 10GbE is a must-have, look for NAS models with a PCIe expansion slot or built-in 10GbE ports.
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Pros
- Expands to 7 drive bays with a DX525 expansion unit for up to 140 TB storage capacity.
- Includes a 2.5GbE network port, offering faster transfers than 1GbE models.
- Runs Synology DiskStation Manager (DSM) 7.3, which users find easy to set up and navigate.
- Features 4GB of DDR4 ECC RAM, expandable to 32GB, suitable for virtualization and multi-user environments.
- Operates quietly, with reported noise levels between 18-24 dB.
- Toolless drive installation simplifies adding or replacing drives.
Cons
- Lacks a PCIe slot, preventing 10GbE network upgrades.
- The 2-core AMD R1600 CPU does not support hardware transcoding for Plex due to the absence of Intel Quick Sync.
- M.2 NVMe slots are restricted to caching only for storage pools unless using Synology-approved drives.
- Only includes one USB 3.2 Gen 1 port, which limits peripheral connectivity.
- Third-party drives, while compatible after a policy reversal, may still display as 'unverified' in the system.
Dimension Scores
The NAS achieves sequential read speeds up to 276 MB/s and write speeds up to 224 MB/s, which is above 1GbE but limited by the 2.5GbE port.
Synology is known for its stable DSM software and offers a 3-year limited hardware warranty, extendable to 5 years.
While a 2-bay unit, it can expand to 7 bays with a DX525 unit, supporting up to 140 TB, which is a significant amount of storage for its class.
After a policy reversal, most standard HDDs and SATA SSDs are compatible, but third-party drives may show as 'unverified,' and M.2 NVMe drives have specific restrictions for storage pools.
Best For
- Small businesses needing scalable on-site storage with a mature software ecosystem.
- Users requiring robust data protection and surveillance solutions through DSM.
- Individuals or small teams needing multi-user file access over a 2.5GbE network.
- Those who prioritize ease of setup and management for their NAS.
Not Recommended For
- Users requiring 10GbE networking speeds for very large file transfers.
- Heavy Plex users who rely on hardware transcoding for media streaming.
- Performance-first buyers seeking the fastest possible CPU or network options.
Watch Out For
- No PCIe slot means you're stuck with 2.5GbE; there's no way to upgrade to 10GbE later.
- The AMD R1600 processor doesn't have Intel Quick Sync, so Plex hardware transcoding is off the table.
- M.2 NVMe drives are limited to caching functions for storage pools unless they are Synology-approved, which can be a bummer if you wanted them for primary storage.
- Synology's drive compatibility, while improved, still flags third-party drives as 'unverified,' which can be unsettling even if they function.
- The single USB 3.2 Gen 1 port is a bit restrictive if you plan on connecting multiple external devices.
Full Specifications
| ASIN | B0CBTVMMLB |
| Size | 166 mm x 106 mm x 223 mm |
| Brand | Synology |
| Color | Black |
| Material | Metal, Plastic |
| Item Weight | 3.33 pounds |
| Manufacturer | Synology |
| Item model number | DS725+ |
| Product Dimensions | 8.78 x 4.17 x 6.54 inches |
| Item Dimensions LxWxH | 8.78 x 4.17 x 6.54 inches |
What Buyers Say
The biggest head-scratcher with the DS725+ is the lack of a 10GbE upgrade option, which many users expected given its price point and Synology's other models. Despite this, the 2.5GbE port is a welcome upgrade from older 1GbE models, and the DSM software continues to be a major draw for its ease of use and feature set. The AMD R1600 CPU is a point of contention, especially for those hoping for hardware transcoding for Plex. The ability to expand to 7 bays is a plus, but the drive compatibility warnings for non-Synology drives, even if functional, are a recurring concern.
“Man, I really wanted 10GbE for my video editing, but nope, stuck with 2.5GbE. DSM is still awesome, but this CPU for Plex is a real bummer, my movies stutter sometimes. Should've just gotten the 723+ or waited.”
Common Praise
- The DSM 7.3 software is intuitive and makes setup and management straightforward.
- The 2.5GbE network port provides a noticeable speed bump over older 1GbE NAS units.
- The option to add a DX525 expansion unit for 5 more bays offers significant storage scalability.
- The unit operates very quietly, making it suitable for home or office environments.
- Toolless drive installation is a convenience that simplifies maintenance.
- The inclusion of ECC RAM, expandable to 32GB, is appreciated for data integrity and virtualization.
Common Complaints
- No PCIe slot means no 10GbE upgrade, which feels like a step backward compared to some competitors and older Synology models.
- The AMD R1600 CPU doesn't support hardware transcoding for Plex, limiting its utility for media server enthusiasts.
- M.2 NVMe drives are restricted to caching for storage pools unless they are Synology-branded, which feels like an unnecessary limitation.
- The single USB 3.2 Gen 1 port is considered insufficient for users with multiple external devices.
- Even with the policy reversal, third-party drives still show 'unverified' warnings, which can be annoying.
- Some users feel the per-bay cost is higher compared to 4-bay Synology models.
Ownership Tips
- The 2.5GbE port is definitely faster than my old 1GbE NAS, but I still hit its limits when moving huge files around.
- Setting up shared folders and user permissions in DSM is surprisingly easy, even for someone who's not a network wizard.
- The 'unverified' drive warning for my IronWolf drives is annoying, but they've been working fine for months.
- I tried Plex, but without hardware transcoding, it struggles with 4K content, so I'm using a different solution for media.
- The unit is genuinely quiet, I barely notice it running even in my home office.
Frequently Asked Questions
Can I use any hard drives with the DS725+?
Yes, Synology reversed a policy in October 2025, so most standard 3.5-inch HDDs and 2.5-inch SATA SSDs are compatible. However, third-party drives might show as 'unverified'.
Does the DS725+ support 10GbE networking?
No, the DS725+ includes a 2.5GbE port but lacks a PCIe slot, meaning there's no option to upgrade to 10GbE.
Can I use the M.2 NVMe slots for primary storage?
The M.2 NVMe slots are primarily for SSD caching to boost performance. For storage pools, only Synology-approved NVMe drives are supported.
Is the DS725+ suitable for Plex media server with transcoding?
The 2-core AMD R1600 processor in the DS725+ does not have Intel Quick Sync, so it won't handle hardware transcoding for Plex, which can impact performance for multiple streams or demanding formats.
How much storage can the DS725+ hold?
The 2-bay DS725+ can support up to 140 TB of storage when expanded with one DX525 expansion unit, which adds 5 extra drive bays.
Is the setup process complicated for a beginner?
Users report that the Synology DiskStation Manager (DSM) software makes the setup process straightforward and visually intuitive, even for those with little prior experience.
Buying Guide
When you're looking at a NAS like this, you're essentially buying a mini-server for your home or small office. Think about how much data you have now and how much you expect to have in a few years. You'll also want to consider how many people will be accessing it and what they'll be doing – just storing files, streaming media, or running applications. The software, like Synology's DSM, is a huge part of the experience, so don't just focus on the hardware.
2-Bay (expandable to 7-bay)
This tells you how many hard drives you can put inside the unit initially (2). The 'expandable to 7-bay' means you can add an external expansion unit later to increase your total drive count, like adding extra rooms to your house for more storage.
2.5GbE Network Port
This is how fast data can travel between your NAS and your computer. 2.5GbE is 2.5 times faster than standard 1GbE, which is like upgrading from a two-lane road to a five-lane highway for your data, but it's not the fastest option available.
AMD Ryzen R1600 Dual-Core CPU
This is the 'brain' of your NAS. A dual-core processor is perfectly capable for file serving and basic tasks, but if you plan on running demanding applications like multiple virtual machines or heavy media transcoding, you might want a more powerful CPU, like needing a bigger engine for a heavier load.
M.2 NVMe Slots (for caching)
These are slots for super-fast SSDs that act as a temporary storage area (cache) to speed up frequently accessed data. It's like having a fast-access drawer for your most important documents, making things feel snappier without needing to upgrade all your main hard drives.
Alternatives
If you need faster network speeds for large file transfers, look for NAS units with built-in 10GbE ports or a PCIe slot for a 10GbE upgrade card. For dedicated media server use with hardware transcoding, prioritize models with Intel CPUs that include Quick Sync.
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