The cost of a virtual desktop is a function of how your workforce operates, the infrastructure you run, and the control you need to maintain. This page evaluates the underlying cost of four delivery models and identifies when each makes more sense than the next.
Setup costs are excluded from this comparison. Azure Virtual Desktop and self-hosted HCI both require a comparable foundation: a golden image pipeline and the orchestration layer that sustains every desktop at scale. What follows evaluates the recurring, per-user cost of running each platform once live.
Azure Virtual Desktop
When compute cost should track demand precisely. Dedicated session hosts within your environment scale in real time and charge only for active usage. Every performance tier is available on demand, from standard workstations to GPU-equipped machines, with native integration across Microsoft 365, Entra ID, and Intune.
Windows 365
When a flat monthly rate per user is the priority. Each user receives a dedicated Cloud PC, available on any device, with no infrastructure to size or manage. At lower enrollment counts, no other model is more economical. For workforces with shift workers, contractors, or seasonal staff, Windows 365 Flex extends the model on a concurrent basis, licensing for active sessions rather than every enrolled user.
Self-hosted HCI - Proxmox
When the public cloud is not cost-effective, not suitable, or not yet viable. Each user runs their own dedicated virtual machine with exclusively allocated CPU, memory, and storage, on non-shared hardware. Proxmox is open-source, fully auditable, runs on commodity hardware, and carries no virtualization licensing fees.
Self-hosted HCI - Nutanix
When self-hosted isolation is the right foundation and the organization requires a fully integrated, commercial stack with a single vendor accountable for hardware, software, and lifecycle management.
The Infrastructure Cost Comparison
The Architectural Math & Assumptions
Our financial model relies on conservative, defensible metrics. The "infrastructure included" projections are a direct function of the following hardware and operational constraints:
- Cluster CapEx: $60,000 for a 3-node Proxmox HCI cluster (dual-socket nodes, ~256 GB RAM each, NVMe Ceph, redundant 25 GbE). Fully specced to carry 75 isolated desktops alongside existing server workloads with high-availability headroom. At 75 users, this translates to a dedicated per-user allocation of approximately 4 vCPU, 8 GB RAM, and 80 GB of NVMe-backed storage.
- Investment Duration: 60 months (5 years), straight-line amortization, yielding $1,000/month for the entire cluster.
- VDI Allocation: 50% of the cluster is attributed to desktops ($500/month hardware, $1,500/month maintenance), while the remaining 50% supports core servers and structural headroom.
- Cluster Maintenance: $3,000/month for competent, proactive HCI stewardship covering hypervisor health, Ceph storage management, patching, backup validation, and incident response. The desktop workload carries half of that cost.
- Fixed & Variable Ops: Both self-hosted Proxmox paths carry approximately $300/month of fixed platform cost: the optional Proxmox subscription at roughly $185/month and a small allowance for monitoring tooling and platform overhead. Backup is handled by Proxmox Backup Server, which is open-source and carries no licensing cost. Variable expenses run $13/user, covering Windows E3/VDA licensing.
Notes:
The "Flat" AVD Line: AVD combined with our orchestration is charted as a flat $29/user rate. In practice, cloud costs curve; lower volumes face minimum tenant fees and always-on host reserves, while higher volumes gain scaling efficiency. Crucially, AVD achieves this baseline by sacrificing environment isolation. Multiple users share a single operating system instance.
The "Flat" Windows 365 Line: The Windows 365 line reflects a 2 vCPU / 8 GB Cloud PC at $33 per user per month, the standard configuration for a knowledge worker on Microsoft 365 apps, browser, Teams, and Outlook. For that workload, the experience is fully adequate and will not feel like a compromise. Under sustained CPU pressure, such as large Excel models, heavy PDF processing, or multiple resource-intensive apps running simultaneously, this tier begins to show its limits, and the 4 vCPU / 16 GB configuration at approximately $53 per user is the more appropriate baseline. For full workstation-class requirements, an 8 vCPU / 32 GB Cloud PC runs $123 per user, with GPU-equipped configurations available at higher price points.
The Nutanix Line: Nutanix AOS Pro licensing adds approximately $2,250/month in software subscription for a 3-node cluster, on top of a hardware capex of roughly $80,000 and the same maintenance allocation. This raises the fully-loaded VDI fixed base to approximately $4,100/month, moving the Windows 365 crossover to around 205 users and the AVD crossover to around 256 users.
The Windows Enterprise Gate: Microsoft 365 Business Premium does not grant Virtual Desktop Access (VDA) rights for on-premises deployments. Operating sovereign desktops on private HCI mandates an upgrade to Microsoft 365 E3 or standalone VDA licensing, introducing a structural ~$10–$15 variable premium per user factored into the TCO math.
IT Operating Models: Where Does Your Investment Go?
This data exposes the economic thresholds that should drive your infrastructure strategy. The right answer depends not only on user count, but on whether your cluster is already serving other workloads and how its costs are shared.
| User Count | The Strategic Verdict |
|---|---|
| Under 20 Users | Windows 365 is the clear choice. At very low headcounts the flat Cloud PC rate is difficult to beat on any basis, and the absence of infrastructure to manage makes it the operationally sound default. |
| 20 to 115 Users | The Tipping Point Band. Where the cluster already exists and its costs are shared across other workloads, Proxmox self-hosted becomes more economical than Windows 365 from around 20 users. Where hardware and maintenance are fully attributed to the desktop workload alone, that crossover moves to approximately 115 users. |
| Beyond 115 Users | Sovereign Scale. Proxmox self-hosted infrastructure, fully loaded with hardware amortization and cluster maintenance, costs less per user than Windows 365 on any accounting basis. Beyond approximately 144 users it undercuts the AVD baseline as well, delivering fully isolated desktops for less than the cost of shared cloud compute. Nutanix reaches those same thresholds at approximately 180 and 225 users respectively, reflecting the premium its software licensing carries. |
The Bottom Line: The economics of self-hosted HCI are driven by fixed costs that must be shared broadly to justify the model. Where a cluster already serves multiple workloads, the desktop cost falls quickly and the crossover with cloud pricing arrives early. Where the cluster exists for desktops alone, that crossover requires scale. In either case, the resource isolation, data sovereignty, and performance consistency of private infrastructure remain constants that cloud cannot replicate.