Best NAS for Plex: Top Picks & Buying Guide

The best network attached storage (NAS) for Plex is the Synology DS923+ for most users. It combines a powerful enough CPU for several 1080p transcodes, four drive bays for ample storage, and Synology’s polished DSM operating system that makes Plex setup and management straightforward. While it can’t handle heavy 4K transcoding, it’s the best balance of price, performance, and ease of use for the typical Plex library.

What to Look For

Before diving into specific models, understand the specs that actually matter for a Plex server. The most critical is the CPU, specifically its PassMark score. Plex uses this to estimate transcoding capability: roughly 2000 points for one 1080p transcode, and 17000+ for one 4K HDR transcode. Next is RAM – 4GB is a comfortable minimum, with 8GB or more for large libraries or multiple concurrent streams. Drive bays determine your maximum storage; 4 bays is the sweet spot for most homes, allowing a RAID 5 or SHR array. Finally, consider expandability: a PCIe slot for 10GbE networking or NVMe caching, and USB ports for external drive backups. Ignore marketing terms like “multimedia NAS” – focus on the CPU and RAM.

Synology DS923+

Strengths: Excellent build quality, the best software ecosystem (DSM) with one-click Plex installation, 4GB RAM (expandable to 32GB), and a PCIe slot for 10GbE or NVMe cache. It supports 4 bays and can be expanded with a 5-bay DX517 unit. It handles 2-3 simultaneous 1080p transcodes.

Trade-offs: The AMD Ryzen R1600 CPU lacks Intel Quick Sync, so 4K transcoding is not viable. It’s also pricier than rivals with similar specs.

Who it’s for: Users who want a set-and-forget Plex server with a friendly interface, prioritize data safety and software polish, and don’t need 4K transcoding.

QNAP TS-464

Strengths: Powered by an Intel Celeron N5095 with Quick Sync, this 4-bay NAS handles 4K HDR transcoding to 1080p smoothly. It comes with 4GB RAM (expandable to 16GB), dual 2.5GbE ports, and two M.2 NVMe slots for caching. QNAP’s QTS is feature-rich, and Plex runs flawlessly.

Trade-offs: QNAP’s software has had security vulnerabilities in the past, and the interface is less intuitive than Synology’s. The default 4GB RAM is soldered, so upgrading means replacing the single SODIMM.

Who it’s for: Plex users with 4K libraries who want to transcode to other devices, and those who want faster network speeds without buying a separate switch.

Asustor AS5404T (Lockerstor 4 Gen2)

Strengths: A powerful 4-bay NAS with an Intel Celeron N5105 (Quick Sync), 4GB RAM (expandable to 16GB), and four 2.5GbE ports with link aggregation. It offers excellent value for the hardware, and Asustor’s ADM is clean and fast. Plex transcoding performance is on par with the QNAP TS-464.

Trade-offs: Asustor’s app ecosystem is smaller than Synology’s or QNAP’s, and the brand is less well-known, so community support is thinner. The build quality is good but not as premium as Synology.

Who it’s for: Buyers who want top-tier hardware specs for the money and don’t mind a slightly less polished software experience.

Synology DS1522+

Strengths: A 5-bay version of the DS923+, offering more storage capacity without an expansion unit. It has the same AMD CPU, 8GB RAM (expandable to 32GB), and PCIe slot. The extra bay allows for a larger RAID 5 array or a dedicated hot spare.

Trade-offs: Same 4K transcoding limitation as the DS923+. It’s also more expensive, and the extra bay may be overkill for smaller libraries.

Who it’s for: Users with growing libraries or those who prefer to keep all drives in one unit, and who value Synology’s software over raw transcode power.

TerraMaster F4-424 Pro

Strengths: One of the most powerful consumer NAS units, with an Intel Core i3-N305 (8 cores, Quick Sync) and 32GB of RAM. It can handle multiple 4K transcodes simultaneously and comes with dual 10GbE ports – a rare feature at this price. TerraMaster’s TOS 6 has improved significantly.

Trade-offs: TerraMaster’s software is still less mature than Synology’s or QNAP’s, and the build quality feels less premium. The powerful CPU generates more heat and noise.

Who it’s for: Power users who need a Plex server that can handle a large family or friends with diverse devices, and who want 10GbE networking without a separate card.

DIY or Old PC (Alternative)

Strengths: Maximum flexibility and often the lowest cost if you have spare parts. You can install a modern Intel CPU with Quick Sync, add as much RAM as you want, and run TrueNAS or Unraid. It can handle unlimited transcodes depending on the hardware.

Trade-offs: Requires time to build, configure, and maintain. Power consumption is often higher than a dedicated NAS, and you lose the polished, low-maintenance appliance experience.

Who it’s for: Tech-savvy users who enjoy tinkering, have a spare PC, or need extreme transcoding performance without paying a premium for a high-end NAS.

How to Choose

Start with your budget. Below $400, you’re looking at 2-bay units like the Synology DS223j or QNAP TS-233, which are fine for direct play but struggle with transcoding. If you can spend $500-$700, the 4-bay models above are the sweet spot. Above that, you’re paying for more bays, faster networking, or a more powerful CPU.

Next, consider your use case. If you only watch Plex on your TV and phone at home, and your files are in compatible formats, you can save money with a weaker CPU. If you travel and need to transcode on the fly, or you share your library with friends, invest in a Quick Sync CPU (Intel). If you have a 4K HDR library, you absolutely need Quick Sync for smooth transcoding.

Finally, weigh the trade-offs. Synology offers the best software but weaker CPUs per dollar. QNAP and Asustor offer better hardware for less money but with a learning curve. TerraMaster offers the most power but with some software rough edges. Also, remember that the NAS is just the beginning – you’ll also need to budget for hard drives, which can easily double the total cost.

Frequently Asked Questions

Q: Can a 2-bay NAS run Plex?
A: Yes, a 2-bay NAS can run Plex for direct playback. However, most have weak CPUs (like Realtek or ARM chips) that can’t transcode. If you only play files that your TV or phone supports natively, a 2-bay is fine. For transcoding, you need at least a 4-bay with an Intel Celeron or better.

Q: What is the difference between transcoding and direct play?
A: Direct play sends the file to your device without any conversion, requiring no CPU power. Transcoding converts the video or audio format on the fly, which uses significant CPU. For example, playing a 4K HDR file on a 1080p TV requires transcoding.

Q: Do I need Plex Pass?
A: Plex Pass is required for hardware-accelerated transcoding (using Quick Sync), which is essential for 4K. It also enables features like offline downloads, parental controls, and multi-user profiles. Without it, you’re limited to software transcoding, which is much slower.

Q: How many streams can a NAS handle?
A: It depends on the CPU and whether transcoding is needed. A Synology DS923+ can handle about 2-3 simultaneous 1080p transcodes. A QNAP TS-464 can handle 2-3 4K transcodes or 5-6 1080p. Direct play streams are limited by network bandwidth, not CPU.

Q: Can I use my existing external drives with a NAS?
A: Yes, most NAS units have USB ports for external drives. You can copy files to the internal array, or even run Plex directly from an external drive, though it’s slower and less reliable. For best performance, use internal drives.

Q: Should I buy a NAS with more bays than I need?
A: Yes, if you can afford it. Adding a drive to an existing array is easier than migrating to a new NAS. A 4-bay unit gives you room to grow from 2 drives to 3 or 4 without a full rebuild.

Bottom Line

For the vast majority of Plex users, the Synology DS923+ is the best choice due to its reliability, software, and ease of use. If you have a 4K library or need to transcode, the QNAP TS-464 or Asustor AS5404T offer better performance for the price. Power users with large families or 10GbE networks should consider the TerraMaster F4-424 Pro. Ultimately, match the NAS to your transcoding needs and budget, and you’ll enjoy a seamless Plex experience for years.

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