Amazon RDS for PostgreSQL Now Supports R5 Instance Types
You can now launch R5 instance types when using Amazon RDS for PostgreSQL. Amazon EC2 R5 instances are the next generation of Amazon EC2 memory optimized instances.
R5 instances are based on the Amazon EC2 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 database instance. With a 1:8 vCPU to memory ratio and the largest size, R5 instances are well suited for running memory intensive database workloads including transaction processing, data warehousing, and analytics. R5 instances introduce a new larger sized instance, r5.24xlarge, which provides 96 vCPUs and 768GiB of memory per instance. Depending on your workload, you may be able to achieve up to 35% performance boost with R5 instances compared to R3 or R4 instances.
Amazon RDS database instances running PostgreSQL versions 9.6.9 (and higher) and 10.4 (and higher) are supported with R5 instance types. You can easily scale up to these new instance classes by modifying your existing DB instance in the AWS RDS Management Console.
Please refer to the Amazon RDS User Guide for more details and refer to Amazon RDS Pricing for pricing details and regional availability.