Overview
The AOOSTAR WTR PRO — AMD Ryzen 7 5825U 4-Bay NAS Mini PC Barebone Kit is a compact NAS-oriented mini PC built around the 8-core, 16-thread AMD Ryzen 7 5825U. It ships without RAM, SSDs, hard drives or an operating system, so you supply DDR4 SO-DIMM memory, M.2 NVMe SSDs, SATA drives and the OS yourself.
The short verdict: if you are comfortable installing TrueNAS, OpenMediaVault, Unraid or Proxmox, this is a strong 4-bay box with plenty of CPU headroom. If you want a plug-and-play NAS with polished vendor apps, look elsewhere.
Storage consists of four 3.5/2.5-inch SATA bays rated at up to 22TB each, for a listed maximum of 88TB.
On top of that, two M.2 2280 NVMe slots can hold the OS, a cache or virtual machine storage.
Networking is dual 2.5GbE, and video output covers DP 1.4 (4K144Hz), HDMI 2.1 and USB-C with DP Alt Mode.
The CPU runs at 2.0GHz base and 4.5GHz boost, with a 15W TDP on a 7nm process, and scores 18677 in PassMark (CPU).
Power draw is listed at 15W–25W under typical load, and a 120 mm fan handles cooling, so the design targets always-on home server duty. The listing does not say how much of that figure accounts for a full set of hard drives, which we cover below.
Compatibility Guide
Memory: two laptop-style DDR4 SO-DIMMs
There are two DDR4 SO-DIMM slots supporting 3200MHz modules, up to 64GB (2x32GB). Desktop DIMMs and DDR5 SO-DIMMs will not physically fit.
This is the most common buying mistake, so make sure the listing says both DDR4 and SO-DIMM. For dual-channel operation, buying two identical modules is the safe choice.
If you plan to run ZFS (TrueNAS and similar), more memory means a larger read cache. Some users want ECC memory for data integrity, but the specifications do not mention ECC support.
If ECC is a requirement for you, confirm with the manufacturer or choose a different product.
Storage: four SATA bays and two M.2 NVMe slots
The SATA bays accept both 3.5-inch and 2.5-inch drives.
The rated limit is 22TB per bay, so larger drives may fall outside the supported range. For NAS use, drives designed for 24/7 operation are the usual choice.
The M.2 slots take 2280-size NVMe drives only; SATA M.2 SSDs will not work.
The compatibility data lists PCIe 3.0, so a PCIe 4.0 SSD will run at PCIe 3.0 speeds.
There is little point in buying an expensive Gen4 drive; a Gen3 model or a reasonably priced Gen4 one is enough.
Operating system: not included
No OS is included. Windows 11 Pro is listed as compatible, but you need your own license.
For NAS duty, options include the free TrueNAS and OpenMediaVault, the paid Unraid, and the Proxmox VE virtualization platform. Installing the OS on an M.2 SSD and keeping all four SATA bays for data avoids wasting a bay on the system drive.
Power: DC 12V adapter and drive spin-up
The unit runs on DC 12V input. A 3.5-inch hard drive briefly draws a large current when it spins up, so starting four drives at once puts far more load on the adapter than the idle figure suggests.
Check the bundled adapter's rating on the product page. If you replace it with a third-party adapter, match the voltage, polarity and capacity exactly.
Network and display
With two 2.5GbE ports, you can put one on your home LAN and the other on a separate segment for management or virtual machines.
To benefit from 2.5GbE, your router or switch also needs 2.5GbE ports.
Connected to 1GbE equipment, transfers top out at 1GbE speeds.
The three video outputs (DP 1.4, HDMI 2.1 and USB-C) support up to three displays at once.
NAS boxes usually run headless, but you will need a monitor and keyboard temporarily for OS installation and initial setup. USB consists of two USB 3.0 and two USB 2.0 ports, plus a Micro SD card slot.
Product Info
Key specifications:
| Item | Details |
|---|---|
| CPU | AMD Ryzen 7 5825U (8C/16T, 2.0–4.5GHz, 15W TDP, 7nm, Socket FP6) |
| Memory | 2x DDR4 SO-DIMM (up to 64GB, 3200MHz), not included |
| Storage bays | 4x 3.5/2.5-inch SATA (up to 22TB per bay), drives not included |
| M.2 | 2x M.2 2280 NVMe, SSDs not included |
| Network | 2x 2.5GbE LAN |
| Video | DP 1.4 (4K144Hz), HDMI 2.1, USB-C (DP Alt Mode) |
| USB | 2x USB 3.0, 2x USB 2.0 |
| Cooling | 120 mm fan |
| Power | 15W–25W (typical load) |
| Warranty | 12 months |
All prices are as captured and will change. On Amazon Japan the unit was ¥73,829 when captured on July 18, 2026, and ¥68,354 when captured on August 19, 2026.Check the retailer's page for the latest price.
These are prices for the bare unit only; memory, SSDs, hard drives and an OS license cost extra.
Check the retailer's page for the latest user reviews. It is worth reading the low-rated reviews for reports of defects or unit-to-unit variation.
The warranty runs 12 months from purchase, with support handled by email.
Build Examples by Use Case
Because this is a barebone kit, the parts you need depend heavily on what you plan to do. The following combinations are a reasonable starting point.
| Use case | Memory | M.2 NVMe | SATA bays |
|---|---|---|---|
| File server / photo archive | 16GB | 1 for the OS | 2–4 HDDs (mirror or RAID) |
| Media server (Plex / Jellyfin) | 16GB | 1 for the OS | 2–4 HDDs |
| Virtualization (Proxmox) + NAS | 32–64GB | 2 (OS and VMs) | 2–4 HDDs |
| Software router | 8–16GB | 1 for the OS | None or minimal |
Treat the table as a baseline. With ZFS, lean toward more memory; with several virtual machines, plan for 32GB or more.
You do not have to buy four drives up front, and starting with a two-drive mirror is common. However, some RAID layouts make adding drives later awkward, so check how your chosen OS handles expansion first.
How It Differs from Turnkey NAS and Regular Mini PCs
Turnkey NAS units from Synology or QNAP pair a dedicated OS with first-party apps, covering everything from backups to photo management in one interface. The WTR PRO has no such software ecosystem; you choose and configure the OS and apps yourself.
In exchange, you get an 8-core, 16-thread CPU and up to 64GB of memory to run virtual machines and containers freely.
Compared with a regular mini PC, the key difference is room for four 3.5-inch drives inside the case.
A typical mini PC has to rely on USB enclosures for bulk storage, which adds cables and is less reliable as a connection. On the other hand, if gaming or video editing is your main goal, a mini PC with a newer CPU and GPU will serve you better.
Who It's For
- DIY NAS builders: Ideal if you want to choose the RAID layout, file system and OS yourself. Reusing DDR4 SO-DIMMs or NVMe SSDs you already own keeps the upfront cost down.
- Compact home server users: With a listed 15W–25W under typical load, it suits always-on file servers and Plex or Jellyfin media servers. For H.264 and HEVC video, the integrated Radeon graphics can handle hardware transcoding.
- Anyone consolidating NAS and VMs: Eight cores, 16 threads and up to 64GB of memory make it a good fit for running a NAS alongside home automation or small services under Proxmox.
- Software router experimenters: The two 2.5GbE ports let you run pfSense, OPNsense or OpenWrt as a router or firewall. For this role, a single M.2 SSD for the OS is enough.
Before You Buy
It will not boot out of the box. You need memory, an M.2 SSD, hard drives if you want NAS storage, and an OS.
Budgeting on the unit price alone can leave you well over plan once parts are added. With four large drives, the drives will usually cost more than the box itself.
Do not assume the 15W–25W figure includes your drives. A 3.5-inch drive typically draws somewhere from a few watts to around 10W, so four drives clearly raise total consumption.
Add the drives' draw when estimating electricity costs. Drive spin-down lowers idle power, but every access then waits for the drives to spin back up.
Assume there is no AV1 hardware decoding. The Ryzen 7 5825U's integrated graphics handle H.264 and HEVC in hardware, but belong to a generation without AV1 support.
If your library is mostly AV1, transcoding falls back to the CPU, raising load and power draw. Plex also requires a paid plan for hardware transcoding, and AMD GPU support varies by OS, so verify before committing.
For router use, check the LAN chip and drivers. No official compatibility list is provided.
If you plan to run a FreeBSD-based OS such as pfSense or OPNsense, research whether the onboard LAN chip is properly supported first.
Perceived noise depends on your drives. The 120 mm fan is designed for quiet operation, but in a NAS the spin and seek noise of hard drives is often louder.
Placing it in a bedroom or right next to your desk may be bothersome, so factor drive noise into where you put it.
Check the listing details. On the Amazon Japan page, the seller and shipper may be shown as Amazon US.
The shipper can affect delivery time and where returns and warranty claims go, so confirm both before ordering. The same series may also list models with different CPUs, so check the title and images to make sure you are buying the Ryzen 7 5825U version.
FAQ
Q. Are RAM and SSDs included? A.
No. As a barebone kit, it needs DDR4 SO-DIMM memory (3200MHz, up to 64GB), M.2 2280 NVMe SSDs, SATA drives and an OS, all purchased separately.
Q. Can I use an M.2 SATA SSD? A.
No. The M.2 slots are NVMe only.
A PCIe 4.0 SSD will work at PCIe 3.0 speeds according to the compatibility data.
Q. Can I use drives larger than 22TB? A.
The rated limit is 22TB per bay. Larger drives may be detected, but they are outside the listed specification and not guaranteed to work.
Q. Can I install TrueNAS or Unraid? A.
The product is designed for you to install your own OS, so x86 systems such as Windows 11 Pro, TrueNAS, Unraid, OpenMediaVault and Proxmox VE can be installed. Driver support varies by OS version, so check each OS's hardware compatibility information first.
Q. Is it good for gaming? A.
Light games run on the integrated graphics, but it is not suited to comfortable 3D gaming. Buy it as a NAS or home server.
Product Disclosure (Amazon)
- Manufacturer: AOOSTAR
- Seller: Amazon US
- Fulfilled by: Amazon US
- ASIN: B0F9WKBFQR
- Note: This article covers a manufacturer-made product based on Amazon listing details.
