At its re:Invent conference in Las Vegas, AWS today announced the launch of Arm-based servers for its EC2 cloud computing service. These aren’t run-of-the-mill Arm chips, though. AWS took the standard Arm cores and then customized them to fit its needs.The company says that its so-called AWS Graviton Processors have been optimized for performance and cost, with a focus on scale-out workloads that can be spread across a number of smaller instances (think containerized microservices, web servers, caching fleets, etc.).

The first set of instances, called A1, is now available in a number of AWS regions in the U.S. and Europe. They support all of AWS’s standard instance pricing models, including on-demand, reserved instance, spot instance, dedicated instance and dedicated host.

For now, you can only use Amazon Linux 2, RHEL and Ubuntu  as operating systems for these machines, but AWS promises that additional operating system support will launch in the future.