It is the most glamorous topic in the Proxmox world and the one most beginners do not actually need. Here is what GPU passthrough is, what it demands, and how to decide - before you spend anything.
Sooner or later every Proxmox user hears that you can give a Windows VM a real graphics card and game or edit video inside it. That is true - with conditions that marketing posts tend to skip. This page is the honest pointer: what passthrough is, what it requires, and whether your Windows VM should have it at all.
Every VM in this guide uses a virtual display adapter - enough for desktops, consoles and office work, but with no real graphics muscle behind it. GPU passthrough (also called PCI passthrough) removes that layer: one physical graphics card in the server is handed over, entirely and exclusively, to one VM. Inside that VM, Windows sees and drives the real card with its real drivers, at close to bare-metal graphics performance.
It is the technology behind gaming VMs, CAD workstations on a server, and GPU-accelerated video or AI work inside a guest. It is also, honestly, a project - not a checkbox you tick during the beginner install in the video, which is why this page is a pointer and not a tutorial.
Ask what the VM does all day. A Windows VM for remote office work, testing, file services, accounts software or a small server role gains nothing from a passed-through GPU - the virtual display is already the right tool, and the install in the video is complete without it. A VM that must game, edit video, run CAD, or do GPU compute is the genuine candidate.
If you do go: finish and stabilise the normal install first, take a backup of the working VM, and only then start the passthrough work with the Proxmox wiki's PCI passthrough documentation open beside you. That order - working VM, backup, then surgery - is the difference between a fun weekend project and a rebuilt server.
The video builds the standard Windows VM first - master that install, and passthrough becomes an optional upgrade, not a rescue mission.
Watch Full VideoNo. Ordinary remote desktop work - office apps, browsers, accounts software, administration - runs perfectly on the standard virtual display adapter. Passthrough is for work that needs the GPU itself: gaming, CAD, video editing, 3D and GPU compute. Adding it for a normal office VM adds complexity and removes a graphics card from the host for no benefit.
IOMMU support end to end: the CPU (Intel VT-d or AMD-Vi), the motherboard, and clean IOMMU grouping for the slot the card will sit in. A powerful card in a host whose board groups it with half the motherboard is a paperweight. Check your exact board and CPU combination in the Proxmox wiki and community reports before buying.
Not with classic passthrough - the card belongs wholly to one VM. True sharing needs special vGPU features limited to certain professional cards and licensing, which is a different and much more expensive world. For home and small-office Proxmox, plan on one card per demanding VM.