The I2 instance type was designed to host I/O intensive workloads typically generated by relational databases, NoSQL databases, and transactional systems.
The largest I2 instance type can deliver over 365K random reads per second and over 315K random writes per second, both measured with a block size of 4 KB. With four instance sizes, you can start small and scale up as your storage and I/O needs grow.
The specs for the new instances:
Each vCPU (Virtual CPU) is a hardware hyperthread on an Intel E5-2670 v2 (Ivy Bridge) processor. The processor supports the AVX (Advanced Vector Extensions), along with Turbo Boost and NUMA.