Amazon EC2 C7i instances

C7i instances deliver up to 15% better price performance than C6i instances. C7i instances also offer up to 1.5x more vCPUs and memory than C6i instance, with up to 192 vCPUs and 384 GiB of memory that you can use to consolidate workloads on fewer instances.

C7i instances add to the broadest and deepest selection of EC2 instances on AWS. C7i provides 11 sizes (including 2 bare-metal sizes: c7i.metal-24xl and c7i.metal-48xl) with varying amounts of vCPU,  memory, networking, and storage.

C7i instances are built on the AWS Nitro System, a combination of dedicated hardware and lightweight hypervisor. Nitro delivers practically all the compute and memory resources of the host hardware to your instances, for better overall performance and security. EC2 instances built on the Nitro System can deliver over 15% higher throughput performance on workloads versus other cloud providers running the same CPU.

C7i instances are powered by custom 4th Generation Intel Xeon Scalable processors with an all-core turbo frequency of 3.2 GHz (max core turbo frequency of 3.8 GHz). These custom processors are only available on AWS and offer the best performance among comparable Intel processors. Both instances include support for always-on memory encryption using Intel Total Memory Encryption (TME).

C7i instances use DDR5 memory that provides higher bandwidth compared to C6i instances. C7i instances support up to 40 Gbps bandwidth to Amazon EBS and up to 50 Gbps of networking bandwidth. With C7i instances you can attach up to 128 EBS volumes to an instance (compared to C6i which allowed up to 28 EBS volume attachments to an instance). C7i instances also support Elastic Fabric Adapter (EFA) in the 48xlarge size and metal-48xl size.

4th Generation Intel Xeon Scalable processors offer 4 new built-in accelerators. Advance Matrix Extensions (AMX) accelerate matrix multiplication operations for applications such as CPU-based ML. Data Streaming Accelerator (DSA), In-Memory Analytics Accelerator (IAA), and QuickAssist Technology (QAT)—available only on C7i bare metal sizes enable efficient offload and acceleration of data operations that help in optimizing performance for databases, encryption and compression, and queue management workloads.

The AWS Nitro System can be assembled in many different ways, allowing AWS to flexibly design and rapidly deliver EC2 instance types with an ever-broadening selection of compute, storage, memory, and networking options. Nitro Cards offload and accelerate I/O for functions, increasing overall system performance.