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Synology DS925+ NAS Buying Guide

Product facts and dated cost

Synology DS925+ · Exact identity: DS925+

4 primary bays · AMD Ryzen V1500B · 4-core · 4GB DDR4 ECC · max 32GB · 2 × 2.5GbE · Diskless: hard drives cost extra

Catalog amount: $769.99 · recent · Price record: 2026-10-09T03:59:30.543917+00:00. Tax and shipping excluded.

Price observed at the store on the shown date. Confirm the current price and availability at the store.

DS925+: specifications and dated store comparison →

A four-bay NAS with room for more storage and memory

Diskless enclosure with 4GB ECC RAM. SATA drives, NVMe SSDs, memory upgrades and the DX525 expansion unit are separate purchases.

The DS925+ is Synology’s 2025 four-bay Plus with a Ryzen V1500B, ECC RAM to 32 GB, dual 2.5GbE and a DX525 path to nine bays. File copies on 2.5GbE are well documented; 10GbE upgrades and hardware video transcode are not. DSM 7.3 restored broader third-party SATA HDDs, while M.2 pools/cache stay listed. ChooseCompute has not tested the enclosure. Noise and watt figures from NASCompares used mixed drive counts and are not Synology’s 1 m lab notes. See the review evidence ↓

Synology DS925+ network attached storage system

Is the DS925+ right for you?

Shared files and backups

Four bays, backup tools and two 2.5GbE ports suit a growing household or small shared workspace. Match memory to the actual workload.[1]

A good fit

More storage later

The DX525 adds five SATA bays. Two M.2 slots offer compatible NVMe cache or storage pools, and RAM can reach 32GB.[1]

A good fit with planning

Faster single-file transfers

A single 2.5GbE client reached about 280 MB/s. Faster multichannel writes required a suitable dual-port client and NVMe setup.[4][5]

Check the whole setup

Heavy 4K conversion

There is no integrated GPU for hardware conversion. One 4K-to-720p software transcode pushed CPU use above 95%.[5]

A poor fit

Key NAS specifications

Full specifications ↗

Follow any specification for its full conditions and sources.

Living with it

Dual 2.5GbE, expansion and media use

01

Check the network mode behind dual-port results

Single-port tests approached 2.5GbE speeds. Frandroid’s dual-port SMB Multichannel increased average NVMe writing from 277.05 to 545.52 MB/s, with a smaller read gain from 244.85 to 283.39 MB/s. ComputerBase’s separate multi-client aggregation reached 407.98/501.37 MB/s write/read from RAID 5. TechRadar’s adaptive load balancing reduced its wired download to 168 MB/s. Network modes, clients and volumes differ.[5][16][4]

02

Plan compatible drives, RAM and DX525 expansion

The four SATA bays can grow to nine with the separate DX525, and memory can reach 32GB with matching modules. DSM 7.3 broadened third-party SATA choice; M.2 pools and cache still depend on compatible drives. No selected review measured DX525 performance.[1][2][3][4]

03

Separate media storage from 4K conversion

Direct-play media serving avoids conversion. Frandroid’s 4K MKV to 720p software transcode exceeded 95% CPU, with codec and bitrate unspecified. Its two-HDD-plus-NVMe system used about 35 W during transcoding. NASCompares’ 63.1 W heavy-load test used four HDDs, SSDs, full CPU load and both network ports; it is a different workload.[11][5]

04

Allow time for DSM setup and size memory for apps

Macworld found the initial path through Synology utilities confusing, while other reviewers were more positive. Allow time for setup, and size memory for your apps: AI de-identification needs at least 8GB, while published user and VM guidelines are not a guarantee for the supplied 4GB.[6][3][4][1]

05

Check small-file behavior beyond the headline speed

Neowin’s DSM 7.3.1 three-drive SHR test retained roughly 290 MB/s sequential rates with a 4 GiB dataset, but random 4K Q1T1 write fell to 0.07 MB/s in that run. Its smaller 1 GiB test behaved very differently. Treat these as workload-specific observations, not a guaranteed sustained rate for every application.[17]

What original reviews found

Our buying advice combines official specifications with the original reviews below. We have not tested this product ourselves. Expand a review for its setup, measurements and limitations.

Dong Knows Tech

Dong NgoJun 27, 2025

Synology DS925+ Review (vs. DS923+): A Solid Replacement, Though Not Entirely an Upgrade

Third-party SATA drives worked after DSM 7.3; throughput remained limited by the 2.5GbE ports.

Read the original review
Test setup, measurements & limitations

Synology DS925+ Review (vs. DS923+): A Solid Replacement, Though Not Entirely an Upgrade

Updated Oct 12, 2025

Tested: Several months with Synology and WDC HDDs and SATA SSDs; initially migrated third-party volumes, then retested on DSM 7.3; no NVMe or expansion-unit test; exact RAM not stated.

Applies to: Current-policy retest and physical network limits; expansion performance is inference, not measured.

  • Third-party SATA drives worked after DSM 7.3; throughput remained limited by the 2.5GbE ports.Source location: Synology DS925+’s performance (vs. DS923+)
  • The DS923+ with its optional 10GbE module surpassed DS925+ in the reviewer’s comparison.Source location: Synology DS925+ vs. DS923+: Not decidedly an upgrade
Measurements reported by the reviewer
MeasurementResultConditions & source location
Energy over 24 hoursapproximately 730 WhFour HDDs installed; exact drive models, workload duty cycle and RAM are not fully specified.Hardware specifications table: Power Consumption (per 24 hours)
HDD SHR write / read292.2 / 294.5 MB/sSingle 2.5GbE; chart identifies HDD SHR. Exact drive MPNs, capacity, client and copy dataset unstated.Write/Read Performance charts
SATA SSD RAID 0 / RAID 1 write and readRAID 0 295.5 / 296.4 MB/s; RAID 1 295.2 / 295.6 MB/sSeparate SATA SSD volumes, not NVMe; single 2.5GbE.Write/Read Performance charts

Limits to keep in mind

  • No DX525 was tested; predicted slower expansion must not be presented as a measurement.
  • No NVMe testing; no inference that NVMe never helps.
  • Article contains outdated Video Station example and overbroad unrestricted-drive wording; official current policy takes precedence.
  • Shopping links present; review-unit sourcing not stated in the read article.
  • June 4 archived page is an announcement. The June 27 review and October 12 DSM 7.3 update were read from the current article separately.
TechRadar

Nick RossJun 11, 2025

I spent weeks with the Synology DiskStation DS925+ NAS box and it didn’t miss a beat, no matter what I threw at it

Single-port wired downloads were fast; adaptive load balancing reduced throughput in this test.

Read the original review
Test setup, measurements & limitations

I spent weeks with the Synology DiskStation DS925+ NAS box and it didn’t miss a beat, no matter what I threw at it

Tested: Four Synology 4TB HDDs in a one-drive-redundant Btrfs volume; two 400GB Synology NVMe drives as a separate volume; TP-Link Deco BE85; Asus ROG Strix Scar 17 X3D 2.5GbE / Wi-Fi 6E and Vivobook 14 Flip Wi-Fi 7. Exact RAM/build unspecified.

Applies to: Single-client wired networking and adaptive load balancing; not SMB multichannel.

  • Single-port wired downloads were fast; adaptive load balancing reduced throughput in this test.Source location: Synology DiskStation DS925+: Performance
Measurements reported by the reviewer
MeasurementResultConditions & source location
Single 2.5GbE download, HDD / NVMe280 / 282 MB/sROG Strix Scar wired to Deco BE85; NAS uses one 2.5GbE port; large video files.Performance: “So, how did the newer DS925+ compare?”
Adaptive load-balancing wired download168 MB/sBoth NAS ports bonded; same 2.5GbE client; both HDD and NVMe volumes. This is not an SMB-multichannel result.Performance: “So, with the DS925+’s two Ethernet cables…”

Limits to keep in mind

  • The article conflates Btrfs with a RAID-5-like scheme; exact RAID name not inferred.
  • Launch SATA restrictions have been superseded by DSM 7.3.
  • No DX525 on hand; expansion-speed discussion is theoretical.
  • Affiliate links disclosed; sample terms not located.
Frandroid

Edouard PatoutJul 14, 2025

Test Synology DS925+ : un très bon NAS, mais il y a un hic

Average-chart NVMe writes rose from 277.05 to 545.52 MB/s with SMB Multichannel; reads increased more modestly from 244.85 to 283.39 MB/s. The prose statement that reads did not improve overstates the chart result.

Read the original review
Test setup, measurements & limitations

Test Synology DS925+ : un très bon NAS, mais il y a un hic

Tested: Two Synology HAT3300 HDDs in RAID1 plus a Synology SNV3410 NVMe volume; Windows 11 client with two 2.5GbE NICs; stock 4GB described, no upgrade stated; DSM 7.2 stated, exact build absent.

Applies to: Useful mixed-storage, SMB-multichannel and software-transcoding observations; exact build and codec parameters not stated.

  • Average-chart NVMe writes rose from 277.05 to 545.52 MB/s with SMB Multichannel; reads increased more modestly from 244.85 to 283.39 MB/s. The prose statement that reads did not improve overstates the chart result.Source location: Des performances intéressantes en multichannel
  • Software 4K-to-720p conversion heavily loaded the CPU.Source location: Des performances intéressantes en multichannel
Measurements reported by the reviewer
MeasurementResultConditions & source location
Single-link NVMe / HDD average write and readNVMe 277.05 / 244.85 MB/s; HDD 204.62 / 189.31 MB/sWindows 11, single 2.5GbE. Two HAT3300 HDDs in RAID 1 and separate SNV3410 NVMe volume, stock 4 GB, DSM 7.2.Single-link HDD/NVMe average charts
SMB Multichannel NVMe / HDD average write and readNVMe 545.52 / 283.39 MB/s; HDD 203.07 / 218.82 MB/sWindows 11 dual 2.5GbE; same volumes. Typical manual-copy values in prose differ from these measured averages.Multichannel HDD/NVMe average charts
4K MKV to 720p CPU / memoryAbove 95% CPU; author reports 800 MB RAMSoftware transcoding with unspecified codec/bitrate. Screenshot shows 95% CPU and 33% whole-system RAM; it does not independently show 800 MB for the process.Transcoding paragraph and DSM screenshot
Idle / HDD-write / Plex-transcoding powerUnder 20 W / above 28 W / approximately 35 WTwo HAT3300 HDDs and one SNV3410 NVMe; meter and ambient conditions unspecified.Power paragraph

Limits to keep in mind

  • Launch drive-lock criticism is historical, not current DSM 7.3 behavior.
  • No universal 4K stream-count guarantee; codec/bitrate matter.
  • Affiliate purchase links present; review-unit loan/supply terms not located in the read text.
  • HDD volume screenshot is about 1.8 TB and NVMe about 362 GB; these do not prove exact HDD MPNs. CPU Mark score is not established as a benchmark run on this NAS.
Macworld

Cliff JosephJun 27, 2025

Synology DiskStation DS925+ review: versatile, expandable NAS drive for small businesses and home workers

The reviewer moved between DS Finder, browser and Synology Assistant before setup succeeded; documentation and app fragmentation were confusing.

Read the original review
Test setup, measurements & limitations

Synology DiskStation DS925+ review: versatile, expandable NAS drive for small businesses and home workers

Tested: Hands-on DS925+ setup on office network, Mac/PC Synology Assistant and iPad DS Finder; RAM, disks/RAID and exact DSM version not disclosed.

Applies to: First-time setup friction only; not a throughput or reliability measurement.

  • The reviewer moved between DS Finder, browser and Synology Assistant before setup succeeded; documentation and app fragmentation were confusing.Source location: Setup paragraphs before “Should You Buy The DiskStation DS925+”

Limits to keep in mind

  • Quoted transfer rates are manufacturer claims, not original measurements.
  • Old maximum-capacity/drive-policy statements are not current limits.
  • Affiliate commission disclosure present; review-unit sourcing not stated.
NASCompares

RobbieMay 2, 2025

Synology DS925+ NAS Review

An embedded meter shows 28.3 W idle with three HDDs, versus 63.1 W under heavy load after adding a fourth HDD and SSDs. Because both hardware and load changed, this is not a same-configuration idle/load comparison.

Read the original review
Test setup, measurements & limitations

Synology DS925+ NAS Review

Tested: Archived article plus full auto-caption text for CSz5aOcJVtc, and nine article-embedded test frames. Initially one 4 TB and two 8 TB Synology Plus HDDs in SHR, stock 4 GB. Noise uses three HDDs; heavy-power test adds a fourth HDD and SSDs, both 2.5GbE links and full CPU load. Original audio and complete video were not reviewed.

Applies to: Exact enclosure. Power/noise are original observations with mixed drive counts. Not interchangeable with Synology’s 20.5 dB(A) / 37.91 W lab notes. Drive-policy comments are May 2025.

  • An embedded meter shows 28.3 W idle with three HDDs, versus 63.1 W under heavy load after adding a fourth HDD and SSDs. Because both hardware and load changed, this is not a same-configuration idle/load comparison.Source location: Article power collage; ASR 4:17–4:45
  • Three-drive noise frames show 37.3 dB idle with automatic fans, 37.2 dB reading with low fans, 46.2 dB read/write with high fans, and 49.1 dB under heavy activity with automatic fans. Phone measurements have unknown distance and calibration.Source location: Article noise collage; ASR 2:36–3:09
Measurements reported by the reviewer
MeasurementResultConditions & source location
Idle / heavy-load power28.3 / 63.1 WThree-HDD idle versus four HDDs plus SSDs, both network ports and CPU load. Hardware differs between readings.Article meter images
Three-HDD noise by modeIdle/auto 37.3; read/low 37.2; read-write/high 46.2; heavy/auto 49.1 dBPhone app shows an A icon, but calibration and distance unknown. Not Synology’s controlled 1 m measurement.Article noise frames
Thermal-camera surface maximaRear 34.9 °C; side 36.6 °C; front 36.4 °CSurface temperatures, not internal drive sensors; ambient unspecified.Article thermal frames

Limits to keep in mind

  • Live NASCompares URL 403; article from Wayback 2025-06-23.
  • Affiliate widgets on the article.
  • May 2025 drive-lock narrative is not current DSM 7.3 SATA policy.
  • Complete auto-captions and embedded stills were reviewed; original audio and full video were not.
  • The author’s speculation that Synology used SSDs for published power/noise is not evidence of manufacturer methodology. Current official noise conditions specify Synology SATA HDDs.
  • Some software-limit rows are stale or wrong; current official tables take precedence.
XDA-Developers

Dhruv BhutaniMay 26, 2025

Synology's locked-down policies make the DS925+ a harder recommendation

DSM 7.2 and mobile apps were the buying reason. Direct-play 4K Plex worked without a GPU; hardware transcode is absent. Launch SATA lock-in dominated the verdict.

Read the original review
Test setup, measurements & limitations

Synology's locked-down policies make the DS925+ a harder recommendation

Tested: Hands-on DS925+; DSM 7.2; Photos and Plex described. RAM/disks/RAID for any speed test not disclosed. No throughput table.

Applies to: Exact enclosure qualitative experience. 90 W adapter claim conflicts with the current official 100/120 W list and is not adopted. Drive lock-in is a DSM 7.2 / May 2025 snapshot versus DSM 7.3 third-party SATA HDDs.

  • DSM 7.2 and mobile apps were the buying reason. Direct-play 4K Plex worked without a GPU; hardware transcode is absent. Launch SATA lock-in dominated the verdict.Source location: Should you buy / Plex / connectivity sections

Limits to keep in mind

  • No MB/s table.
  • 90 W adapter not adopted.
  • Drive-policy snapshot is not DSM 7.3.
  • Five-year uptime refers to the reviewer’s DS918+, not this DS925+. Automatic-update claims were not independently reproduced and conflict with later Neowin setup options.
Tech ARP

Dr. Adrian WongJul 31, 2025

Synology DS925+ Performance Review: How Fast Is It?

On one 2.5GbE link, large-file peak read about 295 MB/s and write almost 310 MB/s. Small-file writes peaked at 263 MB/s. Those copies are drive+RAID+link limited, not a dual-port aggregation test.

Read the original review
Test setup, measurements & limitations

Synology DS925+ Performance Review: How Fast Is It?

Tested: Four HAT3300-4T 4 TB HDDs in RAID 10. Two large videos total 18,246,061,069 bytes; 1,363 small clips/photos total 18,450,262,861 bytes. DS925+ link is described as 2.5GbE; client, RAM and DSM build unspecified. Archived page 1 and three benchmark images read; follow-up page remains unavailable.

Applies to: Exact enclosure, RAID 10, single 2.5GbE. Manufacturer 522/565 MB/s figures in the intro are official claims, not this test.

  • On one 2.5GbE link, large-file peak read about 295 MB/s and write almost 310 MB/s. Small-file writes peaked at 263 MB/s. Those copies are drive+RAID+link limited, not a dual-port aggregation test.Source location: Read/Write Speed for Large/Small Files (Wayback 2025-07-31)
Measurements reported by the reviewer
MeasurementResultConditions & source location
Large-file peak read / writeApproximately 295 / 309.55 MB/sFour HAT3300-4T in RAID 10; 18.246 GB two-video set. Read value comes from prose; write value visually verified in chart.Page 1, large-file results
Small-file peak read / write230.80 / 262.85 MB/sSame RAID 10; 1,363 files totaling 18.450 GB, visual chart values.Page 1, small-file charts

Limits to keep in mind

  • Live TechARP 403; page 1 Wayback only.
  • GbE/RAID follow-up page not read.
  • Launch drive-policy sentence is dated versus DSM 7.3.
  • The comparator DS223j is incorrectly labelled 2.5GbE although it has a 1GbE port. The claimed comparison at identical network speed is not adopted.
  • Large-read chart remained blocked; approximately 295 MB/s is prose-only. RAID/network follow-up page returned access errors.
Android Central

Harish JonnalagaddaApr 23, 2025

Synology DiskStation DS925+ review: A terrific NAS ruined by baffling limitations

Dual 2.5GbE and DSM were welcome. Direct-play 4K Plex worked; there is no hardware transcode engine. The published verdict hinged on Synology-only HDDs at launch.

Read the original review
Test setup, measurements & limitations

Synology DiskStation DS925+ review: A terrific NAS ruined by baffling limitations

Tested: Launch DSM 7.2: two 6 TB IronWolf HDDs failed fresh initialization, while a pool migrated from DS224+ worked. Reviewer then used Synology HDDs; exact final drive model, count, capacity and RAID unspecified. Stock 4 GB described, no memory upgrade stated.

Applies to: Exact enclosure qualitative Plex/direct-play note. HDD lock-in is a 2025-04 snapshot versus DSM 7.3 SATA policy. Not a throughput test.

  • Dual 2.5GbE and DSM were welcome. Direct-play 4K Plex worked; there is no hardware transcode engine. The published verdict hinged on Synology-only HDDs at launch.Source location: Plex / Should you buy
  • Fresh third-party installation and migration behaved differently at launch. Later current SATA policy supersedes that initialization failure; subjective quiet office use and 4K direct play provide no throughput or noise benchmark.Source location: Setup and Plex discussion

Limits to keep in mind

  • Launch policy snapshot.
  • No MB/s table.
  • Affiliate links.
SpaceRex

Jul 28, 2025

DS925+ REVIEW - A great NAS, but should you buy it?

Auto-captions describe approximately 200 MB/s copies with two 4 TB HDDs in RAID 1 and an SSD read cache, then approximately 300 MB/s write and read on a separate NVMe volume. The initial cache prevents attributing every read result solely to the HDD mirror.

Read the original review
Test setup, measurements & limitations

DS925+ REVIEW - A great NAS, but should you buy it?

Tested: Vendor supplied DS925+ and two 4 TB Synology Plus HDDs; author reports no payment or editorial control. macOS SMB, two-HDD RAID 1 initially with SSD read cache of unknown warm-up state. Cache is removed at 14:33 before creating a separate Basic NVMe volume. Auto-captions only; no original audio or video frames reviewed.

Applies to: Exact enclosure. ~200 MB/s is two 4 TB Plus in RAID 1, drive-limited. ~300 MB/s is an NVMe volume saturating 2.5GbE, not HDD. Drive-lock/import behavior is a July 2025 snapshot versus DSM 7.3 SATA HDDs.

  • Auto-captions describe approximately 200 MB/s copies with two 4 TB HDDs in RAID 1 and an SSD read cache, then approximately 300 MB/s write and read on a separate NVMe volume. The initial cache prevents attributing every read result solely to the HDD mirror.Source location: ASR ~12:17–16:28
Measurements reported by the reviewer
MeasurementResultConditions & source location
RAID 1 HDD copyabout 200 MB/sTwo 4 TB Plus HDDs, RAID 1, macOS SMB; SSD read cache initially present, warm-up unknown. Approximate result transcribed from captions.ASR ~13:00–14:15
NVMe volume copyabout 300 MB/sSaturating 2.5GbE, not the HDD pair.ASR ~15:35–16:28

Limits to keep in mind

  • Auto-captions only; no frames; audio not heard.
  • July 2025 lock-in story is not DSM 7.3.
  • Two-drive RAID 1 is not four-bay RAID 5/10.
  • Old IronWolf pool import then failed new-pool/expansion behavior is historical DSM 7.2, not current SATA policy.
ComputerBase

Frank HüberJun 18, 2025

Synology DS925+ im Test: Das gute Upgrade mit 2,5 GbE steht im HDD-Kreuzfeuer

Single-link large-file copies reached 254.86 MB/s write and 272.85 MB/s read; multi-client aggregation reached 407.98/501.37 MB/s. These are different workloads, not one-client doubling.

Read the original review
Test setup, measurements & limitations

Synology DS925+ im Test: Das gute Upgrade mit 2,5 GbE steht im HDD-Kreuzfeuer

Tested: Four HAT5310-20T 20 TB HDDs in RAID 5, stock 4 GB RAM, DSM 7.2. Two SNV3410-400G SSDs used separately as RAID 1 read/write cache or an SSD volume. Single 2.5GbE and separate multi-client dual-port aggregation.

Applies to: Exact-model multi-workload, encryption, cache, power and noise experiments; launch SATA policy is historical.

  • Single-link large-file copies reached 254.86 MB/s write and 272.85 MB/s read; multi-client aggregation reached 407.98/501.37 MB/s. These are different workloads, not one-client doubling.Source location: Page 2, CIFS and Link Aggregation charts
  • Warmed cache barely changed plain copies but improved encrypted-folder transfers. The separate SSD volume was unexpectedly slower in the aggregated test, an outcome the author reproduced.Source location: Page 3, SSD cache and SSD volume charts
Measurements reported by the reviewer
MeasurementResultConditions & source location
5.9 GB file / 15 GB folder write and readFile 254.86 / 272.85 MB/s; folder 197.93 / 238.80 MB/sSingle 2.5GbE, four 20 TB HDDs in RAID 5; folder contains approximately 4,000 files.Page 2, CIFS
Encrypted file / folder write and readFile 271.14 / 276.66 MB/s; folder 161.41 / 184.66 MB/sAES-256 shared-folder encryption, same single-link setup.Page 2, AES-256
Multi-client aggregate file / folder write and readFile 407.98 / 501.37 MB/s; folder 309.66 / 372.80 MB/sDual-port link aggregation; not one-client SMB Multichannel.Page 2, Link Aggregation
Warm-cache file / folder write and readFile 258.36 / 278.19 MB/s; folder 193.94 / 237.79 MB/sTwo SNV3410-400G SSDs in RAID 1 read/write cache; repeated copies.Page 3, SSD cache
Warm-cache encrypted folder write / read210.32 / 230.08 MB/sCompare with 161.41 / 184.66 MB/s without cache.Page 3, AES-256 cache
Separate SSD volume single / aggregate file write and readSingle 258.19 / 275.94 MB/s; aggregate 299.90 / 308.61 MB/sSeparate SSD volume, not cache; lower aggregated result reproduced by author.Page 3, SSD volume
USB 25 GB transfer time1 min 12 s write; 1 min 13 s readSeparate USB backup workload.Page 2, USB-Backup
Hibernation / idle / file-write power11.6 / 32.6 / 46.7 WFour HDD configuration; distinct from manufacturer ratings.Page 3, Leistungsaufnahme
Idle / access noise34.5 / 35.9 dB(A), as chart labelsDistance/calibration unspecified; fans subjectively quiet, HDD activity audible.Page 3, Lautstärke

Limits to keep in mind

  • Synology loaned the unit; author reports no NDA, editorial influence or publication obligation.
  • Current SATA policy and official software limits supersede launch-era statements.
  • No standardized noise comparison with other publications; storage layouts and cache state differ between tests.
Neowin

Christopher WhiteDec 30, 2025

Synology DS925+ review: A look after backtracking on locking out unapproved drives

A partial legacy pool caused degraded-state warnings during migration. Removing its applications and recreating storage resolved setup. The new three-drive SHR screenshot shows healthy status with a compatibility note rather than an error.

Read the original review
Test setup, measurements & limitations

Synology DS925+ review: A look after backtracking on locking out unapproved drives

Tested: DSM 7.3.1; two loaned Synology 4 TB HDDs plus a 2 TB IronWolf form three-drive SHR with one-drive tolerance; screenshot confirms 3.6+3.6+1.8 TB displayed. Separate old 500 GB HP volume. Stock 4 GB described; 2.5Gb/s link. CrystalDiskMark 7.0.0 x64, five passes; client hardware unspecified.

Applies to: Post-policy-change migration and mixed-drive SHR, with explicit small versus larger benchmark datasets.

  • A partial legacy pool caused degraded-state warnings during migration. Removing its applications and recreating storage resolved setup. The new three-drive SHR screenshot shows healthy status with a compatibility note rather than an error.Source location: Migration, storage setup and disks2 screenshot
  • Sequential rates stayed near 2.5GbE, but increasing the SHR test from 1 GiB to 4 GiB greatly reduced random reads and low-queue random writes. Small benchmark datasets are sensitive to caching.Source location: Performance images
  • Two 512 GB SanDisk NVMe drives were not recognized, with no established cause. This does not prove defective slots or universal compatibility; current model-specific M.2 support remains relevant.Source location: NVMe discussion
Measurements reported by the reviewer
MeasurementResultConditions & source location
SHR 1 GiB read / writeSEQ Q8T1 296.55/295.91; SEQ Q1T1 264.67/255.62; RND4K Q32T16 290.19/78.39; Q1T1 28.03/25.40 MB/sCrystalDiskMark 7.0.0 x64, five passes; each pair is read/write. Sequential block is 1 MiB; small datasets may fit caches.Performance SHR screenshot
SHR 4 GiB read / writeSEQ Q8T1 290.24/296.13; SEQ Q1T1 241.79/270.10; RND4K Q32T16 13.85/67.44; Q1T1 8.94/0.07 MB/sCrystalDiskMark 7.0.0 x64, five passes; each pair is read/write. Sequential block is 1 MiB; small datasets may fit caches.Performance SHR screenshot
Single HDD 64 MiB read / writeSEQ Q8T1 296.10/296.13; SEQ Q1T1 266.97/283.54; RND4K Q32T16 289.15/143.50; Q1T1 27.91/24.74 MB/sCrystalDiskMark 7.0.0 x64, five passes; each pair is read/write. Sequential block is 1 MiB; small datasets may fit caches.Performance single-drive screenshot
Single HDD 4 GiB read / writeSEQ Q8T1 289.82/198.18; SEQ Q1T1 269.90/187.90; RND4K Q32T16 7.86/55.23; Q1T1 5.50/24.95 MB/sCrystalDiskMark 7.0.0 x64, five passes; each pair is read/write. Sequential block is 1 MiB; small datasets may fit caches.Performance single-drive screenshot

Limits to keep in mind

  • Two Synology drives were loaned; other drives came from the reviewer. Affiliate commission disclosed.
  • Exact client, firmware build suffix and drive MPNs incomplete; no measured power, noise, DX525 or Plex transcode capacity.
  • The screenshots offer automatic or manual updates. An earlier review’s forced-update claim is not generalized.
  • The article misnames fans as DS1522+ and uses Container Station terminology; those errors and example capacities are not adopted as specifications.

Common HDD combinations

Examples ordered by recorded drive unit price, which may be historical or an editorial reference. Check capacity, vendor compatibility, included storage and price evidence before choosing. These are component checks, not compatibility certifications.

  • DS925+ + 2 × WD Red Plus 2TB (WD20EFPX, 2TB each) →

    Component total: $1,079.97 · historical · Oldest price record: 2026-10-09T01:23:41.974420+00:00 · 4TB raw, before redundancy.

    Historical price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:59:30.543917+00:00; drive price record: 2026-10-09T01:23:41.974420+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Historical price observation. Recheck the price and availability before buying; this is not a current offer. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.

  • DS925+ + 2 × IronWolf 4TB (ST4000VN006, 4TB each) →

    Component total: $1,149.97 · recent · Oldest price record: 2026-10-09T03:58:24.994342+00:00 · 8TB raw, before redundancy.

    Dated price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:59:30.543917+00:00; drive price record: 2026-10-09T03:58:24.994342+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Price observed at the store on the shown date. Confirm the current price and availability at the store. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.

  • DS925+ + 2 × WD Red Plus 4TB (WD40EFZZ, 4TB each) →

    Component total: $1,159.97 · historical · Oldest price record: 2026-09-27T13:58:17.239646+00:00 · 8TB raw, before redundancy.

    Historical price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:59:30.543917+00:00; drive price record: 2026-09-27T13:58:17.239646+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Historical price observation. Recheck the price and availability before buying; this is not a current offer. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.

  • DS925+ + 4 × WD Red Plus 2TB (WD20EFPX, 2TB each) →

    Component total: $1,389.95 · historical · Oldest price record: 2026-10-09T01:23:41.974420+00:00 · 8TB raw, before redundancy.

    Historical price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:59:30.543917+00:00; drive price record: 2026-10-09T01:23:41.974420+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Historical price observation. Recheck the price and availability before buying; this is not a current offer. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.

  • DS925+ + 4 × IronWolf 4TB (ST4000VN006, 4TB each) →

    Component total: $1,529.95 · recent · Oldest price record: 2026-10-09T03:58:24.994342+00:00 · 16TB raw, before redundancy.

    Dated price estimate. Calculated from separately purchased components, not a complete-system offer. NAS price record: 2026-10-09T03:59:30.543917+00:00; drive price record: 2026-10-09T03:58:24.994342+00:00. Price observed at the store on the shown date. Confirm the current price and availability at the store. Price observed at the store on the shown date. Confirm the current price and availability at the store. Recheck component prices, stock, shipping and tax at the stores before purchase; even recent checks do not guarantee live prices.

Before you buy

DS925+ prices and ownership costs

Start with drives and a separate backup

The enclosure includes no storage drives. Budget for suitable SATA drives and another destination for important backups.[1]

Price expansion around a specific need

DX525, extra RAM and compatible NVMe drives are optional purchases. NVMe alone offered little large-file benefit in TechRadar’s single-port 2.5GbE test.[1][4]

Check memory and license requirements

AI de-identification needs at least 8GB and the 200TB single-volume limit requires 32GB. Two camera licenses and five MailPlus accounts are included; additional licenses cost extra.[1]

Match published workload figures to the installed memory

The full specifications retain manufacturer test conditions. Some application limits use maximum supported RAM or SSD volumes; extra RAM, SSDs and licenses can add to the enclosure cost.[8]

Compare stores for this exact model

Diskless enclosure with 4GB ECC RAM. SATA drives, NVMe SSDs, memory upgrades and the DX525 expansion unit are separate purchases. Check the total delivered price at the store.

Lowest observed price

$769.99

In stock at observation

Currency not confirmed

5 stores · 1 recent price observation

Amazon

Sold by Holiday Electronics Deal

$769.99

Observed price

Currency not confirmed

In stock at observation · Condition not recorded

Observed Oct 9, 2026, 3:59:30 AM UTC[20]

View exact product at Amazon

Newegg

Sold by Newegg

$889.99

Historical price

Stock not confirmed · New

DS925+; factory configuration; diskless enclosure

Observed shipping: $0.00

Observed Oct 9, 2026, 1:19:17 AM UTC[19]

View exact product at Newegg

Adorama

Seller not recorded

$889.99

Historical price

Currency not confirmed

Stock not confirmed · Condition not recorded

Observed Sep 27, 2026, 4:13:46 AM UTC[21]

View exact product at Adorama

Best Buy

Sold by Tech Deal

$889.99

Historical price

Currency not confirmed

Stock not confirmed · Condition not recorded

Observed Sep 27, 2026, 1:53:50 PM UTC[22]

View exact product at Best Buy

Prices are dated observations. Confirm the model, seller, condition, stock and delivered total at the store. Older prices remain visible as history. Links may earn a commission.

Questions before buying

Can it use WD or Seagate hard drives now?

DSM 7.3 broadened third-party SATA support, and Dong retested third-party drives successfully. Still check the exact drive and current policy; M.2 cache/pool compatibility is a separate restriction.[2][3]

Will two 2.5GbE ports give one file transfer 5Gb/s?

Not automatically. Frandroid’s suitable SMB-multichannel setup improved NVMe writes, while TechRadar’s adaptive load balancing reduced one-client wired throughput. Client, protocol, storage and network mode all matter.[5][4]

Is it a good 4K Plex transcoding server?

It can store and serve media, but lacks an integrated GPU for hardware conversion. One selected test pushed CPU use above 95% converting a 4K MKV to 720p; this is a reason to avoid buying it for heavy transcoding.[5]

Do the eight-VM and 80-user specifications apply to 4GB?

They are vendor configuration-dependent guidelines; several application figures use maximum installed memory and SSD storage. They do not establish that the supplied 4GB runs those workloads simultaneously.[1]

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. [1] Synology DS925+ product specifications ↗

    Checked Sep 11, 2026 · Hardware + DSM

  2. [2] DSM 7.3 drive compatibility FAQ ↗

    Checked Sep 11, 2026 · FAQ 2

  3. [3] Dong Knows Tech DS925+ review ↗

    Checked Sep 11, 2026 · Baseline DSM 7.3 retest retained; live 403 this round

  4. [4] TechRadar DS925+ review ↗

    Checked Sep 11, 2026 · 280/282 MB/s single 2.5GbE; ALB 168 MB/s

  5. [5] Frandroid DS925+ test ↗

    Checked Sep 11, 2026 · SMB multichannel ~550 MB/s write NVMe; Plex CPU transcode

  6. [6] Macworld DS925+ review ↗

    Checked Sep 11, 2026 · Setup friction only

  7. [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. [8] 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)

  9. [9] 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.

  10. [10] Newegg — DS925+ ↗

    Checked Sep 11, 2026 · N82E16822108847; title DS925+ diskless 4 GB ECC; slug still says J4125; $889.99 Sold by Newegg

  11. [11] NASCompares DS925+ review ↗

    Checked Sep 11, 2026 · Wayback article + parent ASR CSz5aOcJVtc

  12. [12] XDA DS925+ review ↗

    Checked Sep 11, 2026 · Qualitative DSM/Plex; 90 W not adopted

  13. [13] Tech ARP DS925+ performance review ↗

    Checked Sep 11, 2026 · RAID 10 HAT3300-4T 2.5GbE copies

  14. [14] Android Central DS925+ review ↗

    Checked Sep 11, 2026 · Launch-era Plex/direct-play

  15. [15] SpaceRex DS925+ review video ↗

    Checked Sep 11, 2026 · Parent ASR only; RAID1 ~200 MB/s; NVMe ~300 MB/s

  16. [16] 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.

  17. [17] 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.

  18. [18] B&H product price observation ↗

    Checked Sep 27, 2026 · Captured observation; sha256:6487766105985b443a91c5f08cb899129cf2f8cec02fc3320cdc9ea996cddd91

  19. [19] Newegg product price observation ↗

    Checked Oct 9, 2026 · newegg-main-item; sha256:22f7c52d5171c860efaffde48720aab07b52d84e605096953e2cc171ecd263cc

  20. [20] Amazon product price observation ↗

    Checked Oct 9, 2026 · Captured observation; sha256:769389a62729e4bdfcc14e4323869126c420d775ea3a1f089836748dfd923939

  21. [21] Adorama product price observation ↗

    Checked Sep 27, 2026 · Captured observation; sha256:217af2d31951b38035f4b7869618bc7fb503c8fa1822e0821f8b95bb5ff2a3e0

  22. [22] Best Buy product price observation ↗

    Checked Sep 27, 2026 · Captured observation; sha256:ae7263d101523cdc9da556b14a03a5e1435e1f8f6ed69ede68a492b40a7b40ab

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)

How we research products·Affiliate disclosure