Related: EBS

IO

Provides consistent low latency

4GB - 16TB
4GB - 64TB (Block Express)

With Block Express, IOPS can be adjusted independently from storage size.

Up to 64,000 IOPS per volume
Up to 256,000 IOPS per volume (Block Express)
Up to 1,000 MB/s throughput
Up to 4,000 MB/s throughput (Block Express)

io1 50IOPS/GB (MAX)
io2 50IOPS/GB (MAX)
Also there are caps on EC2 Instance level

Explorer