Four-bay NAS buying guide

Best 4-Bay NAS: Synology, QNAP and UGREEN Compared

Four bays are the practical sweet spot for many homes and small offices. They allow one-drive redundancy with better usable capacity than a two-bay mirror, while keeping the enclosure compact. The right model still depends on software, processor, memory, network speed and whether Plex or Docker matters.

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Quick verdict

DS925+ for the polished DSM workflow, TS-464 for expansion and Plex flexibility, DXP4800 Plus for hardware value

Synology DS925+ is the balanced appliance choice for backup, Photos and DSM services. QNAP TS-464 is the technical all-rounder with Intel graphics, dual 2.5GbE, M.2 and PCIe expansion. UGREEN DXP4800 Plus is the hardware-value choice with Intel 8505, expandable memory, 2.5GbE and 10GbE. No single model wins every workload.

Live exact-model listings

Current 4-bay NAS listings

These live groups merge current Synology, QNAP and UGREEN exact-model catalogues. Only four-bay systems are shown; diskless and populated offers remain distinct.

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Buying decision

Four bays solve capacity only when the RAID and growth plan are realistic

Start with required usable capacity and redundancy, then calculate the drive sizes needed today and after growth. Four bays can be efficient for RAID 5 or equivalent one-drive protection, but two-drive fault tolerance leaves less usable capacity. The enclosure choice comes after the capacity plan.

Interactive decision tool

Best 4-Bay NAS Selector

Use the workload and total-system inputs rather than judging the enclosure alone. Results are planning directions; verify exact model specifications, software support and compatibility before purchase.

Compatibility checklist

Four checks before choosing a NAS brand

Exact model, not brand family

CPU, iGPU, memory ceiling, ports, M.2 use and expansion differ materially within every brand.

Diskless and populated stay separate

A drive bundle is comparable only when exact drive models, capacities, condition and warranty are visible.

Hardware capability is not software support

An Intel iGPU does not guarantee every Plex codec or container path. Check the exact NAS and current software.

Complete cost includes the ecosystem

Add drives, RAM, M.2 devices, network upgrades, switch, UPS and backup before declaring a value winner.

Why four bays are the mainstream capacity sweet spot

Two-bay systems normally devote half of raw capacity to mirroring when one-drive protection is desired. Four bays can use one-drive parity or hybrid RAID to preserve more usable space while still tolerating a disk failure.

This efficiency does not eliminate backup. The array protects availability when a disk fails; it does not protect against deletion, ransomware, enclosure failure, theft or disaster.

DS925+ is the DSM-first four-bay choice

DS925+ combines four SATA bays, dual 2.5GbE, two M.2 slots and support for a DX525 expansion unit. Its value is centered on DSM applications, simple administration and a documented Synology ecosystem.

Its Ryzen V1500B is well suited to storage and services but lacks the integrated graphics evidence many Plex buyers want. Direct play is different from transcoding, and an external media server may be the right companion.

DS425+ serves lighter Synology workloads

DS425+ offers the DSM experience with an Intel J4125, lower memory ceiling and fewer expansion options than DS925+. It can suit backup, Photos and lighter media use where the workload fits its limits.

Do not assume Intel automatically makes it the best Plex system. Check the exact model in Plex’s compatibility information, codec needs, subtitles and current package behavior.

TS-464 is the flexible technical all-rounder

QNAP TS-464 has Intel N5095 compute, Intel UHD Graphics, dual 2.5GbE, two M.2 slots and a PCIe slot. QNAP supports QTS and, on current supported versions, the option to switch to QuTS hero.

This flexibility is useful for Plex, containers, VMs and network upgrades, but it increases planning. Decide the operating system before installing production disks and verify expansion-card compatibility.

DXP4800 Plus leads on built-in hardware value

UGREEN DXP4800 Plus provides Intel 8505 compute, 8GB DDR5 expandable to 64GB, two M.2 slots, one 2.5GbE port and one 10GbE port. That is unusually strong hardware for a four-bay appliance.

The buyer should evaluate UGOS Pro’s current application coverage and maintenance model. Hardware headroom is most valuable when the intended software can use it.

DXP4800 GT changes the high-speed option

The DXP4800 GT uses an AMD embedded processor and dual 10GbE networking. It can be attractive for storage and network-heavy workflows that do not depend on an Intel video engine.

Model names are easy to confuse. DXP4800 GT, DXP4800 Plus and DXP4800 Pro have materially different processors and ports, so marketplace listings must be matched exactly.

Plex direct play and transcoding create different rankings

For direct play, all three brands can serve media when storage and networking are sufficient. The client handles the codec, so the NAS is mainly moving files.

For transcoding, exact integrated graphics, Plex support, Plex Pass and media format matter. TS-464 and Intel UGREEN models become more attractive; DS925+ may be paired with external compute.

Photos and backup favor software maturity

Synology Photos, Hyper Backup and Drive create a cohesive workflow that is easy to explain to non-technical family members. That is a meaningful advantage even when competitors have faster processors.

QNAP and UGREEN can perform photo backup and file synchronization, and Docker allows other applications. Compare the recovery workflow, mobile apps and support documentation rather than only face-recognition features.

Docker and VM workloads favor memory and CPU headroom

A few lightweight containers fit many NAS systems. Immich, Nextcloud, databases and virtual machines can require much more memory, compute and SSD I/O.

UGREEN’s expandable memory and QNAP’s container/virtualization ecosystem can be compelling. Synology remains suitable for selected containers, but the exact model’s memory ceiling should be treated as a hard planning constraint.

Network speed must match the storage pool

10GbE does not make four mechanical disks behave like an all-flash array. Sequential RAID transfers can benefit, while small random operations may remain limited by disk latency.

For ordinary backup, 2.5GbE can be enough. For several users, video editing or SSD pools, 10GbE becomes more relevant. Include switch and client upgrades in the budget.

Drive policy and compatibility affect ownership cost

Synology’s drive policy depends on model generation, DSM and drive type. QNAP and UGREEN are broader but still maintain compatibility lists. M.2 cache and storage-pool rules can be more restrictive than SATA-drive rules.

Choose exact drive models after choosing the enclosure. A populated bundle can save time only when the drives, warranties and condition are clearly identified.

The practical four-bay shortlist

Choose DS925+ for the strongest DSM appliance experience, TS-464 for QTS/QuTS hero and PCIe flexibility, DXP4800 Plus for Intel hardware value and built-in 10GbE, and DXP4800 GT for dual-10GbE storage-focused work.

Use the selector to match workload, software preference, networking and growth. Then compare complete build cost at the same usable capacity and redundancy.

Questions people ask

Best 4-bay NAS questions

Is four bays enough for a home NAS?

For many homes, yes. Four bays provide useful capacity efficiency and room for one-drive parity, but growth and backup plans still matter.

Which 4-bay NAS is easiest to use?

Synology DS925+ is a strong default when DSM’s integrated applications and administration are the priority.

Which 4-bay NAS is best for Plex?

QNAP TS-464 and exact Intel UGREEN models are strong candidates for hardware-assisted transcoding. Verify the exact model in Plex’s compatibility information.

Which 4-bay NAS has 10GbE built in?

UGREEN DXP4800 Plus includes 10GbE plus 2.5GbE; DXP4800 GT lists dual 10GbE. Other models may require upgrades.

Can TS-464 run ZFS?

QNAP supports switching compatible TS-464 systems to QuTS hero. Plan this before installing production disks.

Does DS925+ have an iGPU?

Synology lists the AMD Ryzen V1500B; it should not be treated as an integrated-video transcoding platform.

Should I buy four identical drives?

Identical capacities simplify planning, but exact model compatibility and workload suitability are also important. Keep an independent backup.

Is RAID 5 safe for a 4-bay NAS?

It offers one-drive fault tolerance, but suitability depends on data value, drive size, rebuild risk and backup. RAID is not backup.

Should I use NVMe cache?

Only when the workload benefits and the model supports the intended cache or storage-pool mode. More RAM or faster networking can sometimes be a better upgrade.

How do I compare populated NAS bundles?

Identify every included drive, capacity, condition and warranty, then compare enclosure and drive value separately.

Official references and methodology

Verify the exact NAS model, software and compatibility list

The shortlist compares exact four-bay models from current read-only and dedicated catalogues. Cloudzat separates diskless and populated listings and uses official model pages for CPU, memory, networking, expansion and operating-system facts.

As an Amazon Associate, Cloudzat may earn from qualifying purchases. Prices, model revisions, Plex behavior, drive lists, memory support and software capabilities can change. Verify the exact NAS, drive, accessory and current software before purchase.