Amazon Web Services (AWS) has launched its new Amazon EC2 C9g and C9gd instances, powered by the AWS Graviton5 processor. These compute-optimized instances deliver up to 25% higher performance per vCPU compared to previous-generation C8g instances. The new hardware is designed specifically for compute-intensive tasks, including real-time analytics, video encoding, and agentic AI workloads, and is now generally available in select US and European regions.
Performance Gains with Graviton5
The Graviton5 processor introduces significant architectural improvements aimed at reducing latency and increasing throughput. According to official AWS documentation, the C9g instances feature DDR5 8800MT/s memory, which AWS identifies as the fastest memory of any processor instance in the cloud.
The architecture also includes a five-fold increase in L3 cache compared to Graviton4, alongside a 3x improvement in packet-processing performance. These upgrades are intended to accelerate data-heavy processes, such as in-memory analytics and complex agentic AI loops where CPU-bound reasoning steps are critical.
Technical Specifications and Instance Variants
AWS is offering the C9g and C9gd families in 11 distinct sizes, ranging from medium to 48xlarge, with a bare metal option available for specialized workloads.
- C9g Instances: Optimized for general compute-intensive tasks, these instances leverage Amazon Elastic Block Store (EBS) for storage.
- C9gd Instances: Designed for applications requiring high-speed, low-latency local storage, these include NVMe SSDs. AWS reports that the C9gd offers up to 30% higher storage performance than previous-generation local storage instances.
The 48xlarge configuration provides significant scaling potential, delivering up to 100 Gbps of network bandwidth and 72 Gbps of EBS bandwidth—a 2x increase over the previous generation.
Enhanced Security via Nitro Isolation Engine
With the C9g and C9gd launch, AWS is debuting the Nitro Isolation Engine. This is an enhancement to the Nitro System, which manages resource isolation between virtual machines. The engine uses formal verification to mathematically ensure that access to memory, CPU registers, and I/O devices is strictly mediated through a minimal set of APIs. This addition is intended to provide a higher level of security assurance for customers running sensitive or multi-tenant workloads in the cloud.
Availability and Configuration
As of the current release, C9g and C9gd instances are available in the following AWS regions:
- US East (Ohio)
- US East (N. Virginia)
- US West (Oregon)
- Europe (Frankfurt)
Users can manage these instances through the AWS Management Console, AWS Command Line Interface (CLI), or the AWS SDKs. The instances support a variety of purchasing models, including Savings Plans, On-Demand, and Spot Instances. AWS also provides Instance Bandwidth Configuration (IBC), allowing users to adjust bandwidth allocation between EBS and VPC networking by up to 25% to better suit database or caching requirements.
Worth a look