Amazon Relational Database Service (Amazon RDS) Optimized Writes now supports M5 database (DB) instances. With Amazon RDS Optimized Writes you can improve the write throughput for Amazon RDS for MySQL and MariaDB workloads by up to 2x at no additional cost. This is especially useful for write-intensive database workloads, commonly found in applications such as digital payments, financial trading, and online gaming.
Source:: Amazon AWS