Starting today, Amazon EC2 C5 instances will be available in new 12xlarge, 24xlarge, and Bare Metal sizes. These new instances will be powered by custom 2nd Generation Intel Xeon Scalable Processors (based on the Cascade Lake architecture) with sustained all-core turbo frequency of 3.6 GHz and maximum single core turbo frequency of 3.9 GHz. New Cascade Lake processors enable a new feature called Intel DL Boost which will help speed up typical machine learning operations like convolution, and automatically improve inference performance over a wide range of deep learning workloads. The specifications for the new sizes are in the table below.
from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/06/introducing-new-instance-sizes-for-amazon-ec2-c5-instances/