NAS Mainboard N355 Mini ITX - Compact 2.5GbE NAS Motherboard

Our review of the NAS Mainboard N355 Mini ITX finds it best suited to DIY NAS builders and small home server users who need compact, quiet hardware with modern connectivity. The single biggest reason to buy is the balanced combination of an energy-efficient 12th Gen N355 processor and dual 2.5GbE i226V LAN ports, which deliver noticeably better throughput for file serving and soft router duties than typical gigabit boards. The board's Mini ITX 17x17cm footprint and fanless cooling compatibility make it easy to fit into compact enclosures while supporting up to six 2.5" drive bays for real storage capacity.

Key Features

• 12th Gen N355 processor: Provides 8 cores and a max turbo of 3.9 GHz for responsive multitasking and improved singlethread performance over older mobile chips.
• Dual 2.5GbE networking: Two i226V 2.5GbE ports give higher LAN throughput for backups, media streaming, and VM traffic compared with single gigabit boards.
• Flexible storage options: Two M.2 NVMe slots plus six SATA3.0 ports allow a mix of highspeed cache and multiple 2.5" drives for capacity and performance tuning.
• Compact Mini ITX size: The 17x17 cm board fits small cases and supports common 115x series CPU coolers for simple thermal solutions in quiet builds.
• Wide OS compatibility: Works with Linux, Windows, OPNsense and OMV, making it suitable for NAS, soft router, or media server projects.
• Expansion and I/O: A PCIe 3.0 x4 slot and a small set of USB, video and audio ports support additional network cards, display output and local management.

Who It's For

This board is aimed at DIY users building a home NAS, lightweight virtualization host, or soft router who want better than gigabit network speed without moving to a full server chassis. The low 15W TDP 12th Gen N355 processor and fanless compatibility make it a good fit for energy conscious or noise sensitive environments.

People who need many 3.5" hot-swap bays, ECC memory guarantees, or workstationclass CPU performance should look elsewhere; this Mini ITX design focuses on dense 2.5" drive support and efficient, compact operation rather than rack server features.

Pros & Cons

Pros

• Compact Mini ITX layout with strong storage options gives good capacity in small enclosures.
• Dual 2.5GbE i226V ports deliver solid networking improvements for file transfers and streaming.
• Support for DDR5 SODIMM up to 48GB and two NVMe slots provide modern performance for NAS workloads.
• Wide OS compatibility and a PCIe x4 slot allow flexible deployment and upgrades.

Cons

• Only a single SODIMM slot limits memory upgrade flexibility and requires care when populating RAM.
• Initial memory recognition may require a 5-10 minute wait on first install, which can confuse less technical users.

Specifications

Our Verdict

The NAS Mainboard N355 Mini ITX is a well judged platform for compact NAS and home server builds that need better than gigabit networking and a mix of NVMe plus multiple 2.5" drives. Its efficient 12th Gen N355 CPU, dual 2.5GbE ports and flexible OS support make it good value for DIY users who prioritize small form factor and quiet operation, provided they accept the single SODIMM constraint and the initial memory recognition quirk.

Frequently Asked Questions

Does this board support ECC memory?
No, ECC memory support is not specified for this board; it uses a single DDR5 SODIMM slot up to 48 GB.

Can I use this as a soft router?
Yes, the dual i226V 2.5GbE ports and compatible OS options like OPNsense make it suitable as a soft router.

Is active cooling required?
The board is compatible with fanless setups and 115x series CPU coolers, but thermal needs depend on your enclosure and workload.