Can Amazon EC2 Graviton Instances Run Windows Server?

Amazon EC2 Graviton instances cannot run Windows Server workloads and are restricted to Arm64-compatible Linux distributions and FreeBSD. While AWS Graviton processors offer significant price-performance advantages over traditional x86 instances, Microsoft does not license or support a general-purpose Windows Server operating system for cloud-based Arm64 environments on Amazon EC2. Organizations looking to migrate Windows applications to Graviton must first modernize their workloads to run on Linux-based operating systems, such as through the use of cross-platform frameworks like modern .NET or containerization.

Why Windows Server Is Unavailable on AWS Graviton

The restriction comes down to architecture and operating system licensing rather than hardware capability alone. AWS Graviton processors are custom-built by Amazon using the 64-bit Arm Neoverse architecture (Arm64/aarch64), whereas traditional Intel Xeon and AMD EPYC EC2 instances use the x86_64 architecture.

  1. Operating System Support: Although Microsoft develops Windows 11 on Arm for client devices and maintains internal Arm builds, there is no commercially supported Windows Server Arm64 Amazon Machine Image (AMI) available on AWS.
  2. Instruction Set Incompatibility: Standard Windows Server binaries are compiled for the x86_64 instruction set and cannot execute natively on Graviton processors without emulation or recompilation.
  3. Hypervisor and Driver Ecosystem: EC2 Graviton instances rely on the AWS Nitro System designed around Arm64 virtualization standards, for which AWS and Microsoft only provide production server support on x86 platforms.

Supported Operating Systems on EC2 Graviton

EC2 Graviton instances (including Graviton2, Graviton3, and Graviton4 families like t4g, m6g, m7g, c7g, and r8g) support a wide ecosystem of open-source and enterprise Linux distributions compiled for the arm64 architecture:

  • Amazon Linux: Amazon Linux 2 and Amazon Linux 2023
  • Ubuntu: Ubuntu Server LTS releases
  • Red Hat Enterprise Linux (RHEL): RHEL 8 and newer
  • SUSE Linux Enterprise Server (SLES): SLES 15 and newer
  • Debian, Rocky Linux, and AlmaLinux: Full native aarch64 support
  • Container Optimized OS: Bottlerocket and Amazon ECS-Optimized AMIs
  • BSD Variants: FreeBSD and NetBSD (via supported Arm64 AMIs)

Migrating Windows Workloads to AWS Graviton

Even though Windows Server itself cannot run on Graviton, many applications historically hosted on Windows Server can be refactored to run on Linux-based Graviton instances to capture up to \(40\%\) better price-performance.

1. Replatforming .NET Applications

Legacy applications built on the Windows-only .NET Framework (versions 1.0 through 4.8) require Windows Server and must remain on x86 EC2 instances (such as m6i, m7i, or m7a). However, applications built on modern cross-platform .NET (formerly .NET Core, including .NET 6, 7, 8, and newer) can be compiled directly for linux-arm64 and deployed on Graviton instances or AWS Fargate with Graviton.

2. Moving SQL Server Workloads

Microsoft SQL Server is available on Linux, but Microsoft only supports SQL Server on Linux for the x86_64 architecture. To leverage Graviton for database workloads, organizations typically migrate from SQL Server to Arm-compatible managed database engines such as Amazon Aurora (PostgreSQL or MySQL), Amazon RDS for PostgreSQL/MySQL/MariaDB, or use Babelfish for Aurora PostgreSQL to understand SQL Server's T-SQL protocol without rewriting application queries.

3. Containerizing Applications

Windows Containers require a Windows Server host node and therefore must run on x86 EC2 instances. By porting application code to run inside Linux containers and building multi-architecture Docker images (linux/amd64 and linux/arm64), workloads can seamlessly run on Graviton-backed Amazon ECS or Amazon EKS clusters.

Choosing the Right EC2 Instance for Windows Server

If your workload depends on Windows-specific technologies—such as Active Directory Domain Services, IIS with legacy ASP.NET, Microsoft Exchange, or third-party Windows-only binaries—you must select an x86-based EC2 instance:

  • Intel Xeon Instances: m7i, c7i, r7i (high single-threaded performance and broad enterprise compatibility)
  • AMD EPYC Instances: m7a, c7a, r7a (often \(10\%\) to \(20\%\) lower cost than comparable Intel instances while maintaining full Windows Server x86_64 compatibility)