Unraid OS Windows 10 VM

June 5, 2018

A lot of the information here come from this guy.

He makes really good videos to explain Unraid OS concepts.

Windows 10 VMs with GPU Passthrough

The purpose is to create a Windows 10 KVM VM with a dedicated GPU to have optimal performances.

Stage 1: Setup the VM without any passed through hardware

I. Download a copy of the latest windows 10 iso

You can download the official image from here.

Copy it to a share on our Unraid system (isos by default)

II. Get a cheap Windows 10 license

You can find really cheap licenses on different marketplaces like Amazon.

III. Install the virtio drivers

On Unraid, in Settings/VM Manager, we can download the laster VirtIO driver ISO for Windows.

IV. Install the system

Unraid is using the first vCPUs (first CPU 0) for computing, it is better to let them free.

When assigning Logical CPUs (threads) to a VM, it is best practice to make sure we are assigning both hyperheaded pairs of each core.


Always make sure we have enough RAM for our server as well as the VM.

For Windows 10, we need at least 2GB.

To be safe, 8GB should be fine.


Leave the BIOS set as OVMF unless we can’t install the OS with this setting.

If passing through a GPU, the GPU must support EFI boot to use OVMF.

If we know our GPU doesn’t support EFI, then use SEABIOS.

Hyper V

Hyper V should be set to Yes.

OS Install

The OS Install ISO should be set to our Windows 10 ISO’s location.

OS Install CDRom Bus should be set to IDE.

VirtIO Driver

VirtIO Driver ISO should be set to the location of the VirtIO driver we have downloaded.

VirtIO Driver CDRom Bus should be set to IDE.


We don’t need a large vDisk, we will store most of the data on the array using mapped drives and symlinks.


When we need to choose a disk to install Windows, we will see no disk appearing in the list.

To see the vDisk, we need to install a driver.

Click on Load driver and Browse.

Select the virtio-win CD Drive/viostor/w10/amd64 and click on next.

We will be able to see the vDisk and complete the installation.

V. Post install tasks
Setup Windows Initialization

Setup Up Region, Keyboard Layout, Netowrk (to skip), User Settings, Cortana and Privacy Settings during the initialization.

VirtIO Drivers

Go to the Device Manager, we will see 3 devices that don’t have a driver in Other Devices.

The Display Adapter is a driver to install as well.

Click on Update Driver and Browse my computer for driver software.

Look for the location of our VirtIO CDRom and next to install the driver.

Repeat the operation for each missing driver.

guest-agent install

Go to virtio-win drive and install gpu-agent/qemu-ga-x64.msi.

Video Settings

We can now change the video resolution going in Display Settings.


We can download a bunch of packages in the same time thanks to some services like ninite.

We can disable windows 10 phoning home with our data by install a tool like Windows Privacy Tweaker.

VI. Remote connection to the VM

VLC is used by default on Unraid. It is not the most performant one.

Using one like splashtop or teamviewer will considerably improve the perfomances.

To have remote distance feature with splashtop using a free account, we just need to set a vpn router from our server to access it locally.

Pimp Settings

We need to change some windows settings for a better VM experience.

Power Options

In Choose what the power button does disable Turn on fast startup. In Choose or customize a power plan click on High performance, then go to Change plan settings and disable Hard disk/Turn off hard disk afer and USB settings/USB selective suspend setting/Setting. When done, you can disable Turn off the display as well.

Disable indexing

It is useful to reduce unnecessary IO on the vdisk. Go to services.msc and stop Windows Search service and disable it from its properties.

Run cmd as administrator and enter powercfg -h off. To disable disk fragmentation, go to the local disk properties and tools/optimize. Then go to change settings and untick Run on a schedule.

Create a share with SMB enable. Map a network drive and relocate document folder. If you cannot find it in Windows tap your server address \\[ip]\ in file explorer. Modify the related symlink (Downloads for example).

VIII. Install a virtual sound card

You need to modify the VM xml under the video tag at the bottom of the file:

<sound model='ich9'>

Stage 2: Passthrough the hardware needed

I. Essentials checks before attempting passthrough
1. CPU/Motherboard must support IOMMU

Intel’s implementation of IOMMU is known as VT-d. AMD’s implementation of IOMMU is known as AMD-Vi.

2. IOMMU group

Any hardware that is passed through needs to be in its own IOMMU group it can’t share a group with other hardware (unless that is also going to be passed through at the same time). If a device is in a group with devices that we don’t want to pass through, we need to set Enable PCIe ACS Override in Settings/VM Manager and reboot the system.

II. Passing through the GPU
III. Passing through the sound
IV. Fixing demonic sound
V. Three common GPU passthrough problems and how to solve them
VI. Making non EFI compatible GPU EFI compatible
VII. Passing through a USB controller

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