x1.16xlarge instances: You can now launch x1.16xlarge, the newest size of EC2 Memory Optimized instances, featuring 64 vCPUs, 976 GiB of memory, and 1 x 1,920 GB SSD storage. X1 instances are optimized for running in-memory databases like SAP HANA, big data processing engines like Apache Spark or Presto, and high performance computing (HPC) applications. X1 instances are certified by SAP to run production environments of the next-generation Business Suite S/4HANA, Business Suite on HANA (SoH), Business Warehouse on HANA (BW), and Data Mart Solutions on HANA on the AWS cloud. The x1.16xlarge offers half the memory of the x1.32xlarge for workloads that don’t require a full 2TB of memory.
Source: Amazon Web Services News Introducing new Amazon EC2 X1 instance size, x1.16xlarge, and expansion of X1 instances to new regions