AWS Unveils Amazon EC2 R9g and R9gd Instances Powered by Graviton5: A New Benchmark in Cloud Efficiency and Formally Verified Security
SEATTLE — Amazon Web Services (AWS), a subsidiary of Amazon.com, has officially announced the general availability of the Amazon EC2 R9g and R9gd instance families. Powered by the cutting-edge AWS Graviton5 processors—hailed by the company as the most energy-efficient custom silicon ever engineered by AWS—these memory-optimized virtual servers deliver up to a 25% boost in compute performance compared to their predecessors, the Graviton4-based R8g instances.
Designed to tackle the world’s most demanding memory-intensive enterprise workloads, the rollout represents a significant leap forward in cloud computing architecture. By combining unprecedented power-efficiency, advanced hardware-level configurations, and industry-first security innovations, AWS is aiming to reshape expectations for enterprise-grade infrastructure.
Main Facts: What Are the R9g and R9gd Instances?
At their core, the Amazon EC2 R9g and R9gd instances are memory-optimized virtual servers engineered to execute complex, data-heavy computations with exceptional speed and lower energy consumption.
- The Graviton5 Advantage: Powered by AWS Graviton5 processors, the R9g family offers greater performance per vCPU, enhanced memory speeds, increased network and Amazon EBS bandwidth, and a larger L3 cache compared to earlier generations.
- R9g vs. R9gd: While both variants offer identical compute and networking capabilities, the R9gd instances come equipped with ultra-fast, local NVMe-based SSD block-level storage. This local storage serves as high-performance scratch space or low-latency temporary caches.
- Formally Verified Security: Both instance families run on the AWS Nitro System and feature the Nitro Isolation Engine (NIE). This integration uses formal verification—a rigorous mathematical technique—to provide absolute, mathematically proven precision regarding virtual machine isolation, securing memory, CPU registers, and I/O devices against interference.
- Granular Flexibility: Supporting Instance Bandwidth Configuration (IBC), administrators can dynamically adjust bandwidth allocations between Amazon EBS and Amazon VPC networking by up to 25%, tailoring performance to specific database or caching profiles.
- Broad Availability: Available immediately in 11 distinct sizing tiers, scaling smoothly from modest
mediumconfigurations (1 vCPU, 8 GiB RAM) up to massive bare-metalmetal-48xlbuilds boasting 192 vCPUs and 1,536 GiB of RAM.
Chronology: The Evolution to Graviton5 and the R9 Generation
The arrival of the R9g and R9gd instances is the culmination of years of iterative engineering, building on the steady maturation of AWS’s custom silicon strategy.
- The Early Generations (2018–2021): AWS disrupted the cloud landscape with the introduction of its initial Graviton ARM-based processors, proving that custom silicon could yield major price-performance advantages for scale-out applications.
- The Graviton3 and Graviton4 Eras (2022–2024): Subsequent iterations rapidly closed the feature gap with traditional x86 architecture, adding enhanced vector processing, improved memory encryption, and high-density core counts. The introduction of the R8g family established memory-optimized standards for distributed data platforms.
- Early 2025 (The Nitro Milestone): AWS introduced the Nitro Isolation Engine (NIE) alongside the C9g and M9g compute and general-purpose instances, pioneering the concept of a formally verified cloud hypervisor.
- Today (General Availability): AWS brings the convergence of Graviton5 silicon and formally verified Nitro architecture to memory-optimized workloads, officially launching R9g and R9gd instances into production across multiple global regions.
Supporting Data: Comprehensive Technical Specifications
The R9g and R9gd series are built to scale seamlessly across enterprise demands. Below are the complete specifications for both instance families.
Amazon EC2 R9g Specifications (EBS-Only)
| 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 Storage)
| 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.general (or large) | 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 3900 GB (3×1900) | 50 | 36 |
| r9gd.48xlarge | 192 | 1536 | 3 x 3800 GB | 100 | 72 |
| r9gd.metal-48xl | 192 | 1536 | 3 x 3800 GB | 100 | 72 |
Official Insights: Architecture, Security, and Target Workloads
According to AWS leadership and technical announcements authored by cloud specialist Daniel Abib, the R9g design focuses sharply on eliminating modern data center bottlenecks.
Target Use Cases
Because these instances excel at handling rapid read/write operations and extensive memory footprints, they are tailored for:
- In-Memory Caching & Databases: High-velocity engines such as Valkey, Redis, and Memcached.
- Distributed Analytics: Real-time big data processing pipelines.
- Containerized Microservices: Modern cloud-native deployments running on Kubernetes, Docker, Amazon EKS, and Amazon ECS.
- Polyglot Programming Environments: Native support for applications written in C/C++, Rust, Go, Java, Python, .NET Core, Node.js, Ruby, and PHP.
Deep Dive: The Nitro Isolation Engine (NIE)
A standout feature of the R9g release is the expansion of the Nitro Isolation Engine. Speaking on the architectural significance of the feature, AWS engineering teams highlighted that traditional virtualization security relies on extensive testing procedures that can leave edge-case vulnerabilities.
By leveraging formal verification, AWS uses mathematical logic to prove that hardware and software components execute precisely as intended under all possible execution states. This makes the Nitro System the industry’s first formally verified cloud hypervisor, guaranteeing that virtual machine memory, CPU registers, and I/O access paths remain strictly partitioned.
Implications: What This Means for Enterprises and the Cloud Industry
The general availability of R9g and R9gd instances carries major operational and financial implications for enterprise cloud architecture:
- Seamless Upgrades and Zero Code Refactoring: Organizations currently running workloads on R8g instances can migrate to R9g instances with virtually no friction. Because multi-architecture container images built for Arm64 run natively, application logic remains untouched while enjoying instant performance dividends.
- Accelerated Sustainability Goals: As global enterprises face mounting pressure to shrink their carbon footprints, Graviton5’s focus on power efficiency offers a direct method of cutting Scope 3 emissions associated with cloud infrastructure without sacrificing throughput.
- Redefining Cloud Security Standards: The formal verification of the Nitro Isolation Engine raises the bar for multi-tenant isolation. Financial institutions, healthcare providers, and government entities with strict regulatory mandates can leverage these instances with heightened confidence in hardware-enforced data privacy.
- Frictionless Migration Pathways: AWS has rolled out supporting mechanisms—such as the AWS Graviton Getting Started Guide, the Graviton Savings Dashboard, and automated code-transformation tooling via AWS Transform for legacy Java applications—to ensure that shifting workloads from traditional x86 architectures to ARM is streamlined and cost-effective.
Pricing and Regional Availability
As of today, Amazon EC2 R9g and R9gd instances are globally live in select AWS Regions:
- US East: N. Virginia and Ohio
- US West: Oregon
- Europe: Frankfurt
Customers can provision these instances using multiple purchasing models to optimize spend, including Savings Plans, On-Demand Instances, Spot Instances, Dedicated Instances, and Dedicated Hosts.
Developers and systems architects looking to deploy can access the instances immediately through the Amazon EC2 console utilizing supported Linux distributions, including Amazon Linux 2023, Amazon Linux 2, Ubuntu 22.04+, RHEL 8.4+, SUSE Linux Enterprise Server 15 SP3+, and Debian 12+. For automated management, engineers can also integrate the rollout with the AWS MCP Server and associated plugins.
