AWS Graviton2-based database instances are now generally available for Amazon Aurora PostgreSQL Compatible Edition and Amazon Aurora MySQL Compatible Edition. Graviton2 instances provide up to 20% performance improvement and up to 35% price/performance improvement for Aurora depending on database size. You can also mix and match Graviton2 R6g and Intel R5 instances within the same cluster for your primary instance or for your read replica, enabling you to maximize price/performance improvements based on workload requirements. Graviton2 instances are already generally available for Amazon RDS for MySQL, Amazon RDS for PostgreSQL, and Amazon RDS for MariaDB.
Source:: Amazon AWS