Minisforum N5 Air Review: More Power Than You Expect From a Barebones NAS

The Minisforum N5 Air is a 5-bay NAS built around an AMD Ryzen 7 255 processor with 10GbE plus 5GbE networking, a PCIe x16 expansion slot, OCuLink, and USB4. As a barebones unit, it packs more features and raw processing power than NAS units costing two to three times as much. The tradeoff is a plastic chassis and some build quality compromises. After a full teardown and benchmark suite, here is what stands out and what falls short.

Specifications

Component	Details
CPU	AMD Ryzen 7 255 (8C/16T, up to 4.97GHz, 45W TDP)
GPU	AMD Radeon 780M (integrated)
RAM	Barebones, DDR5 SO-DIMM (max 96GB, 2 slots, up to 5600MHz)
Drive Bays	5x 3.5"/2.5" SATA with tool-less trays
M.2 Slots	3x NVMe (Slot A: PCIe 4.0 x4, Slot B: PCIe 4.0 x2, Slot C: PCIe 2.0 x1)
Stock Drive	64GB eMMC-class NVMe (pre-installed with MinisCloud OS)
Networking	1x 10GbE (Realtek RTL8127) + 1x 5GbE (Realtek RTL8126)
USB	2x USB4 (40Gbps), 1x USB 3.2 Gen 2, 1x USB 2.0, 1x internal USB 3.2 Gen 2
Video	HDMI (8K@60Hz / 4K@144Hz)
Expansion	PCIe x16 slot (PCIe 4.0 x4 electrical), OCuLink (PCIe 4.0 x4)
Power	DC 19V external adapter
Dimensions	199 x 202 x 252mm
Fans	2x 92mm rear exhaust + 1x NVMe cooling fan

What Barebones Means

The N5 Air ships with no RAM and no hard drives. The only storage included is the 64GB eMMC-class boot drive pre-loaded with MinisCloud OS. Before this device is usable, you need to purchase:

• DDR5 SO-DIMM RAM -- at minimum one stick, though two for dual-channel is recommended. Budget at least 16GB for basic NAS use, 32GB or more if you plan to run Proxmox, Docker, or ZFS.
• Hard drives or SSDs for actual storage -- the 5 SATA bays are empty.
• An NVMe drive (recommended) -- the stock 64GB boot drive is a slow eMMC-class chip on PCIe 2.0 x1. It is adequate for booting an OS, but if you plan to run containers, VMs, or anything beyond basic file serving, you will want a proper NVMe drive in Slot 1 for your workloads.

Factor these costs into your purchase decision. The advertised price gets you the enclosure, motherboard, and CPU, but the total cost of a usable system is significantly higher.

Build Quality and Design

The N5 Air has a plastic outer shell with a matte finish. It is well-constructed plastic, thick and cleanly molded, but plastic nonetheless. Pick it up and you immediately notice it is lighter than a metal-chassis NAS. The drives are noticeably louder through the plastic walls than they would be in a metal enclosure.

The standout design feature is the slide-out motherboard tray. Remove two screws from the bottom and the entire motherboard slides out from the front of the chassis on a metal tray. This gives you immediate access to the CPU cooler, RAM, all three NVMe slots, and the PCIe x16 expansion slot. It is genuinely one of the best internal access designs in this product category.

The drive trays are the weakest point. They use an interference-fit clip system that requires significant force to operate. The pull tabs are difficult to grip and I found myself reaching for a flathead screwdriver every time. The clips snap into place with an audible click, and it is easy to imagine them wearing out over years of drive swaps. The trays do include rubber vibration dampening pads, which is a nice touch, but the overall mechanism feels like a cost-saving decision that undermines an otherwise thoughtful design.

The rear panel has a diamond-pattern ventilation grille over the dual fans, with all I/O ports arranged below. The magnetic front panel covers the drive bays and snaps on and off cleanly. I tested drive temperatures with the panel on and off during sustained I/O and found no meaningful difference, so it is purely cosmetic.

Internal Layout

With the motherboard tray slid out, the layout is dense but accessible. The CPU sits under a blower-style cooler with a heatpipe heatsink array. The PCIe x16 slot runs alongside it, and the DDR5 SO-DIMM slots sit beneath the cooler shroud, accessible by removing three screws.

The three M.2 NVMe slots are on the underside of the tray, covered by a small dedicated cooling fan. Third-party NVMe heatsinks like the Be Quiet MC1 fit under this fan with tight but workable clearance. The stock 64GB boot drive occupies one slot and is a short-form M.2 with an eMMC-class controller (BAYHUB Samsung-CJNB4R). It negotiates at PCIe 2.0 x1 and is adequate for booting an OS but nothing more.

The PCIe x16 slot accepts half-height, single-slot cards. I tested fitment with an NVIDIA Tesla P4, which filled the slot completely. The AMD Ryzen 7 255 includes a Radeon 780M iGPU with hardware encode and decode support, so a dedicated GPU is unnecessary for media transcoding workloads like Jellyfin or Plex.

Cooling and Noise

Two 92mm rear exhaust fans pull air through the drive cage. They use 4-pin connectors but with a small proprietary form factor, not standard PC fan headers. Replacement fans would need the correct connector. The fans are quiet, and in practice the spinning hard drives produce more noise than the cooling system. The plastic chassis does transmit more mechanical drive noise than a metal enclosure would.

Under a 5-minute all-core CPU stress test, the Ryzen 7 255 reached a maximum of 72C while sustaining 50W package power. No thermal throttling occurred. The cooling solution handles the 45W TDP chip with significant headroom. This is a meaningful advantage for anyone planning to run compute-heavy workloads alongside NAS duties.

NVMe Slot Analysis

The three M.2 slots are not equal, and the manual's claimed lane allocations do not fully match measured behavior. I confirmed this by testing the same NVMe drive in multiple slots:

Slot	Manual Claim	Measured	Notes
Slot 1	PCIe 4.0 x1	PCIe 4.0 x4	Full speed, better than advertised
Slot 2 (boot)	--	PCIe 2.0 x1	Stock 64GB eMMC-class drive
Slot 3	PCIe 4.0 x1	PCIe 4.0 x2	Confirmed slot-side limitation via drive swap

The x2 limitation on Slot 3 follows the slot, not the drive. I tested both a PCIe 4.0 (Corsair Force MP600) and PCIe 3.0 (Patriot P320) drive in each slot: both negotiated x4 in Slot 1 and x2 in Slot 3. If you are adding a fast NVMe, put it in Slot 1.

The Ryzen 7 255 has 20 PCIe 4.0 lanes total. The N5 Air exposes many expansion options (3x M.2, OCuLink x4, PCIe x16 at x4, 2x USB4) that collectively could exceed the available lane budget, which likely explains the reduced bandwidth on Slot 3.

Storage Performance

Benchmarked with 5x HGST Ultrastar 7K4000 4TB drives (enterprise drives from 2014, all with zero SMART errors) in a ZFS RAID-Z2 configuration providing 10.9TB usable storage.

ZFS RAID-Z2 Pool (5x HDD, JMicron JMB58x SATA controller)

Test	Result
Sequential Write	486 MB/s
Sequential Read	405 MB/s

Solid throughput for a 5-drive HDD array over a JMicron SATA controller.

NVMe Storage

Drive	Slot	Sequential Read	Sequential Write
Corsair Force MP600 (PCIe 4.0)	Slot 1 (x4)	2,948 MB/s	1,255 MB/s
Corsair Force MP600 (PCIe 4.0)	Slot 3 (x2)	2,682 MB/s	2,470 MB/s
Patriot P320 512GB (PCIe 3.0)	Slot 1 (x4)	2,687 MB/s	2,076 MB/s

NVMe performance is strong. The Gen4 drive in the x4 slot delivers nearly 3 GB/s read, well above what the 10GbE network link can consume.

Network Performance

The 10GbE Realtek RTL8127 NIC was tested against a Proxmox server (Supermicro M12) via a Unifi 10GbE switch on the same L2 segment.

Test	Result
Single stream	8.44 Gbits/sec
4 parallel streams	9.27 Gbits/sec

Single-stream performance is solid. Multi-stream approaches full line rate. One important caveat: the RTL8127 requires an out-of-tree driver on Debian 13 (kernel 6.12). The driver builds cleanly from source, but native in-kernel support does not arrive until kernel 6.16. The 5GbE RTL8126 port works with the in-kernel r8169 driver out of the box.

Power Consumption

Measured at the wall using a Shelly Plus Plug US smart meter, cross-validated with AMD RAPL for CPU package power. Note: a Tesla P4 GPU was installed in the PCIe slot during testing, adding approximately 10-15W to idle power.

State	Wall Power	CPU Package
Idle (5 HDDs spinning)	70.3W	3.8W
Idle (HDDs spun down)	38.2W	3.9W
Full CPU stress	133.7W	50.0W

Without the Tesla P4, the base system idle would be closer to 25-28W with drives spun down, which is very efficient for the amount of processing power available.

The external DC power brick is functional but adds clutter. A built-in PSU would have been a welcome improvement.

CPU Performance

Test	Result
Single-thread (sysbench)	2,244 events/sec
Multi-thread 16T (sysbench)	19,482 events/sec
Memory read (1M blocks)	72.8 GB/s
Memory write (1M blocks)	42.0 GB/s

The Ryzen 7 255 is significantly overpowered for pure NAS duties. This is a processor that can comfortably run Proxmox with multiple containers and VMs while simultaneously serving files over 10GbE. The Radeon 780M iGPU adds hardware media transcoding without needing a discrete GPU.

Thermal Profile

Phase	CPU (Tctl)	GPU (edge)	RAM	Tesla P4
Idle	33C	32C	37.5C	53C
15s stress	67C	48C	38.2C	53C
35s stress	72C	52C	39.2C	53C

The CPU sustains 50W at 72C with no throttling. The cooling solution is well-matched to the 45W TDP chip, leaving significant thermal headroom for sustained workloads.

Who Is This For

The N5 Air targets the buyer who wants maximum features and performance per dollar and is willing to accept plastic construction and some design compromises to get there. The barebones price gets you an 8-core Ryzen processor, 10GbE networking, PCIe expansion, OCuLink, USB4, and three NVMe slots. That is a feature list that competes with devices at two to three times the price. Just remember that RAM, drives, and ideally an additional NVMe drive are required purchases on top of the base unit.

It excels as a combination NAS and home server. The Ryzen 7 255 has more than enough power to run Proxmox, Docker containers, Jellyfin, and other services while handling file serving duties. The integrated Radeon 780M handles hardware transcoding without a dedicated GPU.

Where it falls short is the tactile experience. The drive trays are frustrating, the plastic chassis lets more noise through, and the external power brick adds desk clutter. If premium build quality matters more to you than raw specifications, look at metal-chassis alternatives. But if you prioritize what the hardware can actually do over how it feels in your hands, the N5 Air delivers outstanding value for a barebones NAS.