Amazon RDS now supports X2g instances for MySQL, MariaDB, and PostgreSQL databases.

Amazon Relational Database Service (Amazon RDS) now supports AWS Graviton2-based X2g database (DB) instances for MySQL, MariaDB, and PostgreSQL databases. X2g DB instances offer double the memory per vCPU compared to R6g/R5 instances and the lowest cost per GiB of memory in Amazon RDS for MySQL, MariaDB, and PostgreSQL databases. The X2g.16xl DB instance has 33% more memory than previously available in Amazon RDS DB instances for MySQL, MariaDB, and PostgreSQL databases and is a great choice for memory-intensive DB workloads.

Source:: Amazon AWS