Yes, if the NAS has an x86 processor with hardware virtualization and enough memory. Synology, QNAP and UGREEN ship a hypervisor as a free app, and TrueNAS has virtual machines built in. The catch is memory: a NAS that ships with 4GB or 8GB cannot run a Windows VM alongside its own duties, and the memory upgrade is the first thing to plan. This guide covers which platforms support VMs, what the hardware needs, and how to size the memory.
The short answer
| Platform | Hypervisor | Requirement |
|---|---|---|
| Synology DSM | Virtual Machine Manager | x86 plus, xs or rackmount model; Synology publishes the supported list |
| QNAP QTS and QuTS hero | Virtualization Station | Intel or AMD model with VT-x or AMD-V; QNAP publishes the supported list |
| UGREEN UGOS Pro | Virtual machine app | NASync DXP models with Intel processors |
| TrueNAS (Linux edition) | Built in | Any x86 hardware with virtualization enabled in firmware |
| ASUSTOR ADM, TerraMaster TOS | Containers, not full VMs on most models | Docker and LXC are the route on these platforms |
Check your model on the maker's page for the hypervisor app before you plan around it. The model lists change, and ARM-based and entry-level units are excluded.
What a VM on a NAS is good for
A NAS runs 24 hours a day, sits next to the data, and already has backups and snapshots. That makes it a natural home for small services that must stay up: a Windows domain controller or print server for a small office, a Linux box running a database or an internal web app, a second DNS server, a test machine for software that cannot run in a container. It is a poor home for anything heavy. NAS processors are low-power parts, the drives are shared with file service, and a VM that needs real CPU or disk throughput belongs on a dedicated server.
What the hardware needs
Processor
The hypervisor needs hardware virtualization: Intel VT-x or AMD-V. Every Synology, QNAP and UGREEN model on the supported lists has it. On TrueNAS you enable it in the board's firmware. More cores let more VMs run at once without starving the NAS itself; a four-core processor runs two light VMs comfortably.
Memory
This is the constraint. The memory you assign to a VM is reserved from the host for as long as the VM runs. The NAS operating system, the file cache and every other app have to live in what is left. A workable rule:
- Reserve 4GB for the NAS operating system and its services, more if it runs several apps.
- Add each VM's allocation: 4GB to 8GB for Windows, 2GB to 4GB for a Linux server.
- Add 2GB to 4GB of headroom so the file cache does not collapse.
One Windows VM on a NAS that also serves files therefore wants 16GB. Two VMs want 32GB. The virtualization RAM guide works through the arithmetic with examples, and how much RAM a NAS needs covers the rest of the workloads.
Storage
Put VM disks on an SSD volume or an SSD cache if the model has one. A VM on spinning drives shared with file service will feel slow at boot and during updates.
Which NAS models have the memory for it
Look for a two-slot model with a published maximum of 32GB or more. In the Synology range that means the Ryzen-based plus and xs models (DS923+, DS1522+, DS1621+, DS1821+ and the rackmounts), which take DDR4 ECC SODIMM. In the QNAP range the TS-x64, TS-h and TVS-h models take DDR4 or DDR5 SODIMM or UDIMM with 32GB to 64GB maximums, and the QNAP memory guide lists them. UGREEN DXP models take DDR5 SODIMM up to 64GB on the larger units. On TrueNAS the board sets the limit, and 64GB to 128GB is ordinary.
Containers first
Before you build a VM, ask whether the job can run as a container. A container shares the NAS kernel and uses only what the application needs, so a dozen containers fit where two VMs would not. Nearly every NAS app you can name runs in Docker, and a Windows application is the main reason to need a full VM. The container RAM guide covers sizing for that path.
Memory for the upgrade
Find your model in the NAS memory collection and choose the largest matched pair the listing offers; the listings are built to each maker's maximum. Install guides: Synology ECC SODIMM, QNAP, UGREEN NASync.
Frequently asked questions
Which Synology models can run virtual machines?
Virtual Machine Manager runs on x86 plus, xs and rackmount models. Synology lists the supported models on the package page. ARM-based models cannot run it.
Can a QNAP run Windows in a VM?
Yes. Virtualization Station runs Windows, Linux and other x86 guests on QNAP models with an Intel or AMD processor that supports hardware virtualization.
How much RAM does a NAS need to run one VM?
The VM's allocation plus about 4GB for the NAS itself. A Windows VM with 4GB needs a NAS with at least 8GB, and 16GB keeps the NAS comfortable.
Is a VM on a NAS as fast as a dedicated server?
No. NAS processors are chosen for low power, and the drives are shared with file service. VMs on a NAS suit light, always-on roles: a domain controller, a small database, a Windows app that has to stay running.
Buying NAS memory for one unit or a fleet
A NAS that runs virtual machines is a small server, and its memory should be bought like one. Request a quote with your models and quantities, or contact our sales team. Related: NAS memory hub, business fleet memory and education and government.