Windows 11 Pro for Workstations Key: 4 CPUs, 6 TB of RAM and ReFS

Windows 11 Pro for Workstations key: what the edition adds to Pro

A Windows 11 Pro for Workstations key unlocks the edition that sits above Pro in the Windows desktop range. It keeps everything in Windows 11 Pro (BitLocker, Hyper-V, Remote Desktop, Group Policy) and lifts the hardware limits that held back compute and content-creation machines. Four differences really matter.

• Up to 4 physical processors and 6 TB of RAM, compared with 2 processors and 2 TB on Windows Pro: four-socket workstations can finally use all of their hardware.
• ReFS (Resilient File System): Pro for Workstations and Enterprise can format data drives in ReFS, whereas Windows 11 Pro limits ReFS to Dev Drive. Combined with mirrored Storage Spaces, it detects and repairs silent data corruption on footage libraries or datasets of tens of terabytes.
• NVDIMM-N persistent memory: non-volatile memory modules seen as storage at DRAM speed, whose content survives a power cut. Useful as a working cache for video editing or simulation.
• SMB Direct (RDMA): transfers to a compatible NAS or storage array run without loading the processor, with very low latency on RoCE, iWARP or InfiniBand network cards.

On top of that, the Ultimate Performance power plan is available out of the box: it removes the micro-latencies caused by component power saving during a long render or calculation.

Which edition should you choose? The comparison

Windows 10 reached end of support on October 14, 2025, and the consumer ESU year ended on October 13, 2026: choose Windows 10 Pro for Workstations only for hardware that Windows 11 does not support. All these licenses are genuine Microsoft licenses from the second-hand market, resold lawfully in the European Union under the UsedSoft ruling of the Court of Justice (case C-128/11).

Does your workstation really need it?

To be frank, most PCs gain nothing from this edition. If your machine has a single processor, less than 2 TB of RAM, standard NTFS storage and an ordinary Gigabit network, Windows 11 Pro offers exactly the same software features for less. Application performance does not change from one edition to the other: what differs is the hardware Windows can use.

Pro for Workstations becomes relevant in four specific cases:

• your motherboard takes three or four physical processors;
• you go beyond 2 TB of installed RAM;
• you handle data where integrity comes first: photo and video archives, simulation results, render repositories;
• your network or storage already uses RDMA or persistent memory.

If you also need Credential Guard and application control for a managed fleet, look at our Windows 11 Enterprise key page: Enterprise can format ReFS data drives too.

Compatibility, installation and edition change

There is no dedicated installation image: the standard Windows 11 media already contains Pro for Workstations, and the key you enter decides which edition is installed. On a PC already running Windows 11 Pro, the upgrade happens without reinstalling, through Settings > System > Activation > Change product key. One restart is enough: files, software and settings stay in place. Our Windows 11 installation guide covers every step.

On the hardware side, Windows 11 requires TPM 2.0, Secure Boot and a processor on the list of supported models. Many dual-Xeon workstations from the E5 v3 and v4 generations are not on that list. Windows 10 Pro for Workstations installs on them, but outside the paid ESU program for organizations, Windows 10 no longer receives security updates: our page on Windows 10 end of support explains the options. Last technical point: ReFS is not bootable, so keep NTFS for the system drive and use ReFS for data drives.

Check your hardware before ordering

• Processors: in Task Manager, the Performance > CPU tab shows the number of sockets.
• Memory: the Memory tab shows the installed RAM and the slots in use.
• RDMA: the PowerShell command Get-NetAdapterRdma lists the network adapters with RDMA enabled.
• Persistent memory: the Get-PmemDisk command lists the NVDIMM modules that Windows recognizes.

What you get with your order

• Your key by email, usually within a few minutes of payment (48 business hours at most).
• A VAT invoice in your customer account.
• Lifetime replacement of a faulty key.
• Email assistance 7 days a week, with a reply within 2 hours on average, from our support page.
• Payment by card, Apple Pay, Google Pay or Bancontact.