I3 instances will come in six sizes, with up to 64 vCPUs, 488 GiB of memory, and 15.2 TB of locally attached SSD storage. I3 instances will deliver up to 3.3 million random IOPS at 4KB block size and up to 16 GB/s of sequential disk throughput. I3 instances are powered by dual socket custom Intel® Xeon® E5-2686 v4 Broadwell processors running at a base clock frequency of 2.3 GHz, feature Enhanced Networking with Amazon EC2 Elastic Network Adapter (ENA) and are EBS-optimized by default at no additional cost.