Also see A rumble in Amazon's jungle: AWS now rents out homegrown 64-bit Arm server processors | The Register
"The AWS Graviton Processor powering the Amazon EC2 A1 Instances targets scale-out workloads such as web servers, caching fleets, and development workloads. These new instances feature up to 45% lower costs and will join the 170 different instance types supported by AWS, ranging from the Intel-based z1d instances which deliver a sustained all core frequency of 4.0 GHz, a 12 TB memory instance, the F1 instance family with up to 8 Field Programmable Gate Arrays, P3 instances with NVIDIA Tesla V100 GPUs, and the new M5a and R5a instances with AMD EPYC Processors. No other cloud offering even comes close.AWS Designed Processor: Graviton | James Hamilton Perspectives
The new AWS-designed, Arm-based A1 instances are available in 5 different instances types from 1 core with 2 GiB of memory up to 16 cores with 32 GiB of memory.
I’ve been interested in Arm server processors for more than a decade so its super exciting to see the AWS Graviton finally public, it’s going to be exciting to see what customers do with the new A1 instances, and I’m already looking forward to follow-on offerings as we continue to listen to customers and enhance the world’s broadest cloud computing instance selection. There is much more coming both in Arm-based instance offerings and, more broadly, across the entire of the Amazon EC2 family."