Amazon EC2 R9g and R9gd instances powered by AWS Graviton5 processors are now generally available | Amazon Web Services
Amazon Web Services (AWS), a subsidiary of Amazon.com, Inc., has officially announced the general availability of its new Amazon EC2 R9g and R9gd instance families. Powered by the cutting-edge AWS Graviton5 processors—touted as the most energy-efficient silicon ever designed by the cloud computing giant—these memory-optimized instances represent a substantial evolutionary leap for enterprise workloads. The launch comes as organizations globally face mounting pressure to scale compute-heavy, memory-intensive applications while reining in energy consumption and bolstering cloud infrastructure security against increasingly sophisticated threats.
Main Facts and Architectural Breakdown
The newly introduced R9g instances are engineered specifically for memory-bound and compute-intensive operations, delivering up to a 25% improvement in raw compute performance compared to their predecessors, the Graviton4-based R8g instances. This performance uplift is matched by a larger L3 cache, faster memory subsystems, and elevated network and Amazon EBS bandwidth limits, all while operating at a reduced energy footprint per virtual CPU (vCPU).
Complementing the standard R9g line, the R9gd variants introduce high-speed, local NVMe-based solid-state drive (SSD) block-level storage. These storage-backed instances are designed for use cases that demand ultra-low-latency scratch space or temporary caching layers, such as distributed big data pipelines, open-source transactional databases, and massive in-memory caching grids.
Both instance variants are supported by the AWS Nitro System, a proprietary architecture that offloads critical virtualization, networking, and storage functions to dedicated hardware. This design enables near-bare-metal performance while ensuring strict security isolation between distinct virtual environments.
A cornerstone of the security architecture in the R9g and R9gd families is the inclusion of the Nitro Isolation Engine (NIE). Originally introduced earlier this year with the C9g and M9g lines, the NIE enforces hypervisor isolation with mathematical precision. By leveraging formal verification—a rigorous engineering technique that uses mathematical logic to prove that hardware and software behave precisely as intended across all possible states, rather than just in selected test scenarios—AWS has established what it describes as the industry’s first formally verified cloud hypervisor. This development sets a new benchmark for cryptographic and architectural isolation in multi-tenant cloud environments.
Furthermore, the new instances support Instance Bandwidth Configuration (IBC). This feature gives administrators the flexibility to dynamically adjust bandwidth allocation between Amazon EBS and Amazon VPC networking by up to 25%, allowing fine-tuned performance optimization for databases and real-time analytics engines that fluctuate in I/O demand.
Background Context and Chronological Evolution
The rollout of the R9g and R9gd instances is the latest milestone in AWS’s long-term strategy to design proprietary silicon tailored to cloud workloads. For over a decade, AWS has invested heavily in custom processor development to escape the limitations and rising costs of merchant silicon.
The journey began with the acquisition of Annapurna Labs in 2015, which laid the foundation for the Nitro System and subsequent custom chip efforts. In 2018, AWS introduced its first-generation Arm-based processor, the AWS Graviton, primarily targeting lightweight scale-out applications. Subsequent iterations—Graviton2 (2019), Graviton3 (2021), and Graviton4 (2023)—progressively expanded the scope of supported workloads to include high-performance computing, complex data analytics, and demanding enterprise databases.
With Graviton5 and the R9g generation, AWS is addressing the core bottleneck of modern enterprise computing: memory bandwidth and efficiency. As artificial intelligence integration, large-scale graph databases, and real-time streaming analytics dominate corporate IT spending, memory-optimized instances have become the primary battleground for cloud providers. By pairing custom Arm architectures with advanced verification techniques like the Nitro Isolation Engine, AWS is attempting to capture market share from traditional x86-based providers while addressing enterprise demands for verifiable security and sustainability.
Comprehensive Technical Specifications and Instance Sizing
Both the R9g and R9gd portfolios are structured to offer fine-grained scalability, spanning 11 distinct sizing tiers from entry-level configurations to bare-metal architectures.
The standard R9g instances range from the r9g.medium (1 vCPU, 8 GiB of memory) up to the enterprise-grade r9g.48xlarge and r9g.metal-48xl (192 vCPUs, 1,536 GiB of memory). Network bandwidth scales proportionally, starting at up to 15 Gbps for smaller sizes and reaching 100 Gbps on the largest configurations. Similarly, Amazon EBS bandwidth scales from up to 12 Gbps to a dedicated 72 Gbps.
The R9gd instances match this compute and networking profile while integrating high-performance NVMe storage. Capacities range from a single 59 GB SSD on the r9gd.medium up to three massive 3,800 GB NVMe drives (totaling 11.4 TB of high-speed local storage) on the r9gd.48xlarge and r9gd.metal-48xl instances.
| Instance Family | Instance Size | vCPUs | Memory (GiB) | Instance Storage (NVMe SSD) | Network Bandwidth (Gbps) | EBS Bandwidth (Gbps) |
|---|---|---|---|---|---|---|
| R9g | r9g.medium | 1 | 8 | EBS-Only | Up to 15 | Up to 12 |
| r9g.large | 2 | 16 | EBS-Only | Up to 15 | Up to 12 | |
| r9g.xlarge | 4 | 32 | EBS-Only | Up to 15 | Up to 12 | |
| r9g.2xlarge | 8 | 64 | EBS-Only | Up to 17 | Up to 12 | |
| r9g.4xlarge | 16 | 128 | EBS-Only | Up to 17 | Up to 12 | |
| r9g.8xlarge | 32 | 256 | EBS-Only | 17 | 12 | |
| r9g.12xlarge | 48 | 384 | EBS-Only | 25 | 18 | |
| r9g.16xlarge | 64 | 512 | EBS-Only | 34 | 24 | |
| r9g.24xlarge | 96 | 768 | EBS-Only | 50 | 36 | |
| r9g.48xlarge | 192 | 1536 | EBS-Only | 100 | 72 | |
| r9g.metal-48xl | 192 | 1536 | EBS-Only | 100 | 72 | |
| R9gd | r9gd.medium | 1 | 8 | 1 x 59 GB | Up to 15 | Up to 12 |
| r9gd.large | 2 | 16 | 1 x 118 GB | Up to 15 | Up to 12 | |
| r9gd.xlarge | 4 | 32 | 1 x 237 GB | Up to 15 | Up to 12 | |
| r9gd.2xlarge | 8 | 64 | 1 x 474 GB | Up to 17 | Up to 12 | |
| r9gd.4xlarge | 16 | 128 | 1 x 950 GB | Up to 17 | Up to 12 | |
| r9gd.8xlarge | 32 | 256 | 1 x 1900 GB | 17 | 12 | |
| r9gd.12xlarge | 48 | 384 | 3 x 950 GB | 25 | 18 | |
| r9gd.48xlarge | 64 | 512 | 1 x 3800 GB | 34 | 24 | |
| r9gd.24xlarge | 96 | 768 | 3 x 1900 GB | 50 | 36 | |
| r9gd.48xlarge | 192 | 1536 | 3 x 3800 GB | 100 | 72 | |
| r9gd.metal-48xl | 192 | 1536 | 3 x 3800 GB | 100 | 72 |
Ecosystem Support, Migration, and Developer Resources
To ease adoption, AWS has ensured broad compatibility across major Linux distributions. Out-of-the-box support is available for Amazon Linux 2023, Amazon Linux 2, Ubuntu 22.04 and newer releases, RHEL 8.4+, SUSE Linux Enterprise Server 15 SP3+, and Debian 12+.
For organizations migrating from previous-generation R8g instances, AWS reports that most applications require zero code modifications. Containerized workloads managed via Amazon EKS, Amazon ECS, or standard Kubernetes deployments can be seamlessly transitioned using multi-architecture container images built for the Arm64 instruction set. Furthermore, AWS provides the AWS Transform utility to automate the migration and code refactoring process for legacy Java applications moving from x86 architectures to Graviton.
Developer tooling includes the AWS Graviton Getting Started Guide, the Graviton Savings Dashboard for tracking infrastructural cost efficiencies, and integration with the AWS MCP Server and associated plugins for AI-assisted documentation search and troubleshooting.
Pricing, Regional Availability, and Market Implications
At launch, Amazon EC2 R9g and R9gd instances are deployed in select AWS regions, including US East (N. Virginia, Ohio), US West (Oregon), and Europe (Frankfurt). Enterprises can procure these instances through flexible commercial models, including On-Demand pricing, Savings Plans, Spot Instances, Dedicated Instances, and Dedicated Hosts.
Industry analysts note that the introduction of Graviton5 and the R9g line reinforces AWS’s pricing power and differentiation in the enterprise cloud market. By controlling the entire silicon-to-hypervisor stack—from custom Arm processors to the formally verified Nitro Isolation Engine—AWS can pass performance gains and energy savings directly to customers while maintaining high operating margins. As enterprise customers increasingly prioritize carbon footprint reduction alongside financial cost optimization, the combination of high memory bandwidth, energy-efficient silicon, and mathematically proven isolation is expected to accelerate migration away from legacy, third-party processor architectures.
