AWS Unveils Amazon EC2 R9g and R9gd Instances Powered by Graviton5: A New Era for Memory-Optimized Cloud Computing
SEATTLE — Amazon Web Services (AWS), an Amazon.com company, has officially announced the general availability of the Amazon EC2 R9g and R9gd instance families. Driven by the cutting-edge AWS Graviton5 processors—touted by the company as the most energy-efficient custom processors AWS has ever engineered—these new memory-optimized instances deliver up to a 25% performance leap over their predecessor, the Graviton4-powered R8g instances.
The launch marks a significant milestone in cloud computing architecture, combining massive performance gains, advanced energy efficiency, and mathematically verified security through the AWS Nitro System and the newly integrated Nitro Isolation Engine. As enterprises increasingly demand higher throughput, lower latency, and stringent security for data-intensive workloads, the R9g and R9gd lines arrive as a powerful, drop-in upgrade designed to handle the most demanding cloud environments without requiring code rewrites.
Main Facts
The Amazon EC2 R9g and R9gd instances are purpose-built virtual server options engineered specifically for memory-intensive enterprise applications.
- The Silicon Engine: At the heart of the R9g and R9gd lineup is the AWS Graviton5 processor. Building on the architectural successes of Graviton4, the new processor introduces advanced microarchitectural improvements, delivering up to 25% higher compute performance alongside superior energy efficiency.
- Performance Enhancements: Compared to the R8g generation, R9g instances offer higher performance per vCPU, accelerated memory speeds, expanded L3 cache sizes, and boosted network and Amazon EBS bandwidth.
- Storage Variants:
- R9g Instances: Standard memory-optimized instances utilizing EBS-only storage configurations.
- R9gd Instances: Outfitted with high-speed, low-latency, local NVMe-based solid-state drive (SSD) block-level storage, making them optimal for caching and distributed scratch space.
- Flexible Bandwidth Configuration: Both instance families support Instance Bandwidth Configuration (IBC), enabling administrators to dynamically adjust the allocation of bandwidth between Amazon EBS and Amazon VPC networking by up to 25%.
- Unprecedented Security: Powered by the AWS Nitro System, the instances incorporate the Nitro Isolation Engine (NIE). The NIE leverages formal verification—a rigorous mathematical technique—to provide absolute, mathematically proven isolation between virtual machines, establishing a pioneering benchmark for cloud security.
- Comprehensive Scale: Both R9g and R9gd families are available in 11 distinct sizes, scaling gracefully from
medium(1 vCPU, 8 GiB RAM) up to massivemetal-48xlbare-metal configurations (192 vCPUs, 1,536 GiB RAM). - Initial Regional Availability: At launch, the instances are accessible in the US East (N. Virginia, Ohio), US West (Oregon), and Europe (Frankfurt) AWS Regions.
Chronology and Evolution of AWS Silicon
To fully understand the significance of the R9g launch, it is vital to examine the rapid evolutionary trajectory of AWS custom silicon strategy over the past decade.
The Genesis of Custom Cloud Silicon
Long reliant on merchant silicon from traditional chipmakers, AWS realized that standard off-the-shelf processors could not efficiently scale to meet the specialized, multi-tenant demands of modern cloud computing. This realization led to the acquisition of Annapurna Labs in 2015 and the subsequent birth of the AWS Nitro System, which offloaded hypervisor overhead from the host CPU onto dedicated custom ASICs.
The Graviton Era
- Graviton 1 (2018): AWS introduced its first-generation custom Arm-based processor, aimed primarily at scale-out workloads running on lightweight Linux architectures.
- Graviton 2 (2020): Representing a quantum leap in performance, Graviton 2 proved that Arm-based architectures could handle mainstream enterprise applications, database operations, and containerized microservices with dramatic price-performance advantages.
- Graviton 3 (2021): Focused on high-performance computing (HPC), machine learning inferencing, and cryptography acceleration, Graviton 3 widened the performance gap against legacy x86 architectures.
- Graviton 4 (2023–2024): Deployed across R8g and other instance families, Graviton4 delivered enterprise-grade core counts, enhanced memory bandwidth, and advanced virtualization capabilities.
- Graviton5 (Late 2025): The introduction of the R9g and R9gd instances marks the commercial debut of Graviton5. By focusing heavily on instruction-per-clock improvements, energy efficiency, and tighter integration with the Nitro Isolation Engine, Graviton5 cements AWS’s leadership in proprietary enterprise silicon design.
Supporting Data and Technical Specifications
The R9g and R9gd portfolios are meticulously engineered to cover a vast spectrum of compute requirements. Below are the detailed 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 (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.twoxlarge (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 |
Official Responses and Engineering Insights
In the announcement brief authored by AWS compute specialist Daniel Abib, the emphasis was heavily placed on seamless developer migration and breakthrough hypervisor security.
"If you’re running workloads on R8g instances today, R9g gives you more performance per vCPU with faster memory, higher network and Amazon EBS bandwidth, and a larger L3 cache, all while using less energy," Abib noted.
AWS engineers highlighted that the integration of the Nitro Isolation Engine (NIE) represents a paradigm shift in multi-tenant cloud security. By applying formal verification—a mathematical methodology traditionally reserved for mission-critical aerospace and cryptography systems—AWS has mathematically proven that virtual machine memory, CPU register states, and I/O devices remain strictly isolated.
Furthermore, software compatibility has been a primary design pillar for the Graviton ecosystem. AWS confirmed that applications running on previous Arm-based generations require virtually zero code modifications to transition to R9g. Multi-architecture container images built for arm64 can be deployed directly via Amazon EKS, Amazon ECS, or standard Kubernetes orchestration tools. Supported operating systems at launch include Amazon Linux 2023, Amazon Linux 2, Ubuntu 22.04 and newer, RHEL 8.4+, SUSE Linux Enterprise Server 15 SP3+, and Debian 12+.
Implications for the Enterprise Cloud Market
The arrival of the R9g and R9gd instances carries profound implications across multiple verticals of the enterprise IT landscape.
1. Database and In-Memory Cache Optimization
Memory-intensive workloads—such as relational and NoSQL databases, and in-memory caches like Valkey, Redis, and Memcached—will see immediate performance gains. The combination of Graviton5 compute density and local NVMe storage on R9gd variants allows data-tier architectures to process millions of operations per second with ultra-low latency, reducing overall infrastructure footprints.
2. Sustainability and Cost Efficiency
As corporate environmental, social, and governance (ESG) mandates tighten, energy consumption has become a core metric for IT procurement. By leveraging Graviton5—hailed as the most energy-efficient processor AWS has ever built—organizations can reduce their scope 3 emissions associated with cloud infrastructure while simultaneously lowering compute spend through AWS Savings Plans, On-Demand, and Spot pricing models.
3. Raising the Security Bar
The deployment of the formally verified Nitro Isolation Engine sets a new industry standard. In sectors subject to stringent regulatory frameworks (such as financial services, healthcare, and government defense), proving security mathematically rather than relying solely on empirical testing provides an unprecedented layer of assurance against side-channel vulnerabilities and hypervisor escapes.
4. Acceleration of x86-to-Arm Migration
With developer tooling such as AWS Transform (which automates Java code migrations from x86 to Graviton) and comprehensive guidance via the AWS Graviton Getting Started Guide, the friction of migrating legacy workloads continues to evaporate. The 25% performance uplift delivered by R9g provides a compelling financial and operational catalyst for CTOs and engineering leaders to complete their transition to custom silicon.
Getting Started and Pricing
AWS has made R9g and R9gd instances immediately available for purchase through several procurement models, including On-Demand Instances, Savings Plans, Spot Instances, Dedicated Instances, and Dedicated Hosts.
Developers can begin provisioning instances today through the Amazon EC2 Console using supported Arm-based AMIs. For teams utilizing advanced AI-assisted workflows, AWS has also enabled support for the AWS MCP Server and associated plugins to query instance documentation, check regional availability, and retrieve API references via preferred AI tools.
Detailed pricing schedules, regional compliance documents, and technical whitepapers regarding the Nitro Isolation Engine are currently accessible via the official Amazon EC2 pricing and AWS Documentation portals.
