AWS Unveils Next-Generation Power: Amazon EC2 R9g and R9gd Instances Powered by Graviton5
By Daniel Abib (Adapted by AWS News Editorial)
Published: September 2025
1. Main Facts
In a significant leap forward for cloud computing efficiency and performance, Amazon Web Services (AWS) has announced the general availability of the Amazon EC2 R9g and R9gd instance families. Powered by the newly unveiled AWS Graviton5 processors—hailed as the most energy-efficient custom silicon ever engineered by AWS—these memory-optimized instances represent a paradigm shift for data-intensive cloud architectures.
The flagship R9g instances deliver up to a 25% boost in compute performance compared to their predecessors, the Graviton4-based R8g instances. Designed specifically to shoulder the heavy lifting of memory-bound operations, the R9g lineup targets enterprise-grade databases, real-time analytics engines, in-memory caches like Redis, Valkey, and Memcached, and complex containerized microservice architectures.
Meanwhile, the companion R9gd instances introduce high-performance, local NVMe-based SSD block-level storage directly to the hardware. This makes them the ultimate choice for workloads requiring ultra-low-latency scratch space, distributed caches, and open-source database engines that thrive on proximate, high-speed storage.
Both instance variants are built on the foundational AWS Nitro System, incorporating advanced capabilities such as Instance Bandwidth Configuration (IBC) and the revolutionary Nitro Isolation Engine (NIE). The NIE leverages formal verification—a rigorous mathematical technique—to guarantee hypervisor-level security isolation with absolute precision. R9g and R9gd instances are immediately accessible in major AWS regions, including US East (N. Virginia, Ohio), US West (Oregon), and Europe (Frankfurt), spanning a massive spectrum of 11 different sizing tiers ranging from simple medium configurations up to robust metal-48xl bare-metal environments.
2. Chronology: The Evolution of AWS Custom Silicon
The arrival of the R9g and R9gd instances does not happen in a vacuum; it is the culmination of years of iterative engineering, silicon design innovation, and security evolution within AWS.
- The Early Foundation (2018–2020): AWS disrupted the cloud infrastructure market with the introduction of its first-generation Graviton processors, aimed at scaling out horizontal workloads cost-effectively. Subsequent generations (Graviton2 and Graviton3) rapidly matured, proving that ARM-based architecture could outpace legacy x86 processors in price-to-performance metrics for cloud-native applications.
- The Graviton4 Era (2023–2024): With the rollout of R8g instances powered by Graviton4, AWS solidified memory-optimized ARM instances as enterprise standards. Developers gained access to massive vCPU counts and robust memory bandwidth, establishing the groundwork for large-scale migrations from legacy architectures.
- Early 2025 – Securing the Cloud Hypervisor: AWS introduced the Nitro Isolation Engine (NIE) alongside the C9g and M9g compute and memory families. By integrating formal verification into the Nitro System, AWS transformed hypervisor security, providing mathematical proofs of virtual machine isolation.
- Today (September 2025): AWS reaches a new milestone with the general availability of Graviton5-powered R9g and R9gd instances. This launch marks the simultaneous deployment of the company’s most energy-efficient silicon to date, coupled with advanced bandwidth configuration and mathematically proven hardware isolation at a scale never seen before in enterprise cloud infrastructure.
3. Supporting Data and Technical Specifications
The R9g and R9gd portfolios are meticulously engineered to provide granular scalability, offering 11 distinct size configurations to fit workloads of every magnitude.
Amazon EC2 R9g Specifications (EBS-Only)
R9g instances prioritize pure compute, memory bandwidth, and network performance, scaling up to 192 vCPUs and 1,536 GiB of memory.
| Instance Size | vCPUs | Memory (GiB) | Instance Storage | Network Bandwidth (Gbps) | EBS Bandwidth (Gbps) |
|---|---|---|---|---|---|
| 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 |
Amazon EC2 R9gd Specifications (with Local NVMe SSD)
R9gd instances match the compute and networking prowess of the R9g family while integrating blazing-fast, low-latency local NVMe storage for temporary caches and high-speed scratch space.
| Instance Size | vCPUs | Memory (GiB) | Instance Storage (NVMe SSD) | Network Bandwidth (Gbps) | EBS Bandwidth (Gbps) |
|---|---|---|---|---|---|
| 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.16xlarge | 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 |
Key Hardware Advantages
- Enhanced vCPU and Memory Efficiency: Compared to R8g, R9g yields greater performance per vCPU, faster memory modules, higher network throughput, expanded EBS bandwidth, and a larger L3 cache.
- Instance Bandwidth Configuration (IBC): Administrators can dynamically adjust bandwidth allocation by 25% between Amazon EBS and Amazon VPC networking. This fine-tuning capability ensures that data-heavy database and caching workflows are never starved of I/O throughput.
- The Nitro Isolation Engine (NIE): By delegating virtualization tasks to dedicated AWS Nitro hardware, R9g and R9gd instances achieve near-bare-metal performance. Furthermore, NIE utilizes formal verification—proving mathematically that virtual machine memory, CPU register states, and I/O devices remain securely partitioned—establishing an unprecedented benchmark in cloud security.
4. Official Responses and Industry Context
Engineering leaders and cloud architects across the industry have long anticipated the rollout of Graviton5 architecture. Internal AWS statements emphasize that sustainability and efficiency remain core pillars of modern cloud architecture.
"With Graviton5 and the introduction of the R9g and R9gd instance families, we are giving customers the ability to run their most demanding, memory-intensive workloads faster, more securely, and with significantly reduced energy footprints," notes AWS engineering documentation. "By combining the raw power of our custom silicon with the mathematical certainty of the Nitro Isolation Engine, we are redefining what enterprises can expect from their cloud infrastructure."
Early adopters migrating from R8g instances have reported seamless transitions. Because ARM64-based multi-architecture container images and modern Linux distributions (such as Amazon Linux 2023, Ubuntu, RHEL, and Debian) natively support the instruction set, engineering teams face virtually zero friction when upgrading their instance classes. For legacy applications transitioning from x86 architectures, tools like AWS Transform automate code modifications, drastically lowering the barrier to entry for high-performance ARM migration.
5. Strategic Implications for Enterprise IT
The general availability of Amazon EC2 R9g and R9gd instances carries profound implications for enterprise IT strategies across multiple dimensions:
Cost Optimization and Sustainability
As global enterprises face mounting pressure to reduce both operational expenditures and carbon footprints, the energy efficiency of Graviton5 offers a dual benefit. Organizations can achieve higher transaction throughput per server rack, directly lowering cooling and power overheads while capitalizing on aggressive price-to-performance ratios available through On-Demand, Spot, and Savings Plan pricing models.
Uncompromising Security Paradigms
Security compliance remains a top boardroom priority. The integration of the Nitro Isolation Engine shifts the security conversation from empirical testing to mathematical proof. By formally verifying hypervisor integrity, AWS provides regulated industries—such as finance, healthcare, and government—with the mathematical assurance that multi-tenant boundaries are impenetrable.
Frictionless Modernization and Developer Velocity
The broad compatibility of R9g instances with popular runtime environments (including Java, Python, Go, Rust, C/C++, Node.js, and .NET Core) and container orchestrators (Amazon EKS, Amazon ECS, and standard Kubernetes) means development teams do not need to re-architect their applications to reap the benefits. Upgrading instances is often as simple as modifying an infrastructure-as-code template or selecting a new instance size in the Amazon EC2 console.
Getting Started
Administrators ready to harness the power of R9g and R9gd can immediately deploy instances via the Amazon EC2 Console using supported Arm-based AMIs. For guidance on performance tuning, teams can leverage resources such as the AWS Graviton Getting Started Guide, the Graviton Savings Dashboard, and modern AI-driven tooling like the AWS MCP Server to query documentation and retrieve troubleshooting data effortlessly.
