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Amazon RDS for Postgres now supports M6i and R6i instances with new instance sizes up to 128 vCPUs and 1,024 GiB RAM

Amazon Relational Database Service (Amazon RDS) for Postgres, version 11 and higher, now supports M6i and R6i instances. M6i instances are the 6th generation of Amazon EC2 x86-based General Purpose compute instances, designed to provide a balance of compute, memory, storage, and network resources. R6i instances are the 6th generation of Amazon EC2 memory optimized instances, designed for memory-intensive workloads. Both M6i and R6i instances are built on the AWS Nitro System, a combination of dedicated hardware and lightweight hypervisor, which delivers practically all of the compute and memory resources of the host hardware to your instances.

Source:: Amazon AWS