Clarification Needed: Core-Based Licensing Requirements for a 48-Core Server

Question

Hello,

I would like confirmation and clarification regarding core-based licensing requirements for Windows Server Standard (2025) on my server, which has:

• 2 × Intel Xeon Gold processors = 48 physical cores

According to Microsoft's core licensing rules, every physical core must be licensed, with a minimum of 16 cores per server and 8 cores per CPU. The license is sold in 16-core packs. For this server, I have calculated that 3 × 16‑core packs are required to fully license all 48 cores.

1. Is my understanding correct, and is 3 license packs indeed the minimum requirement for compliance?
2. If I hypothetically install only 1 license pack (16 cores), what exact legal or technical risks would I face in terms of:
   • Licensing compliance and audit
   • Microsoft support and activation
   • Virtualization rights (running VMs under Standard edition)

I appreciate official documentation or references to support your answer.

Thank you!

Answer 1

Hello

Thank you for your feedback. Yes, your understanding seems to be correct: for a 48-core server (2 Intel Xeon Gold processors), 3 16-core license packs are required to fully cover all 48 cores.

If only 1 license pack (16 cores) is installed, you will face risks of license compliance issues, support limitations, and restricted virtualization rights.

Licensing Requirements Confirmation

According to Microsoft's core-based licensing rules, Windows Server 2025 Standard Edition requires licensing for each physical core, with a minimum of 16 cores per server and 8 cores per processor. Licenses are sold in 16-core packages. For a 48-core server, 3 16-core packages (3 × 16 = 48) can fully cover all cores, which appears to be the minimum compliance requirement.

Risks of Installing Only 1 License Package (16 Cores)

Licensing Compliance and Audits: Only 16 of the 48 cores are licensed, leaving 32 unlicensed, which violates Microsoft's licensing terms. During an audit, you may face fines or be required to purchase additional licenses.

Microsoft support and activation: The server may still activate, but non-compliance may restrict certain features or support requests.

Virtualization rights: The Standard edition allows running 2 virtual machines (VMs) when fully licensed. If not fully licensed (only 16 cores), you will not have this right, and running VMs may be non-compliant.

You can refer to the following links:

https://www.microsoft.com/en-us/licensing/product-licensing/windows-server

https://www.microsoft.com/content/dam/microsoft/usetm/documents/windows-server/2025-datacenter-and-standard/oem/UseTerms_OEM_WindowsServer2025_DatacenterAndStandard_English.pdf

https://www.cloudservus.com/blog/windows-server-2025-preview-a-guide-to-licensing-strategies

If the above links do not resolve your issue, you can also ask questions on Microsoft Learn, which has a dedicated Windows Server section with more professional staff to answer your questions.

Windows Server - Microsoft Q&A

I look forward to your feedback.

Best regards,

Tamara-Hu | Microsoft Community Support Specialist