AOC-S25G-M2S Supermicro Dual-Port 25GBE/10GBE Ethernet SFP+Network Adapter

Supermicro AOC-S25G-M2S Dual-Port 25GbE Network Adapter

High-Performance Networking with ConnectX-4 LX Technology

• Model Identifier: AOC-S25G-M2S – Engineered by Supermicro for demanding networking environments
• Powered by Mellanox ConnectX-4 LX controller for reliable and accelerated Ethernet performance
• Supports 25 Gigabit Ethernet protocol, enabling lightning-fast data transmission across modern infrastructures
• Specifically designed to reduce latency and increase bandwidth in enterprise and data center networks

Core Interface and Connectivity Highlights

• Equipped with 2 x SFP28 ports, offering flexibility for dual high-speed connections
• SFP28 interfaces allow compatibility with a variety of optical modules or DACs (sold separately)
• Transceivers not included, giving users the freedom to select the most suitable modules for their setup
• Supports advanced networking protocols and virtualization technologies

Optimized for Space-Efficient System Integration

• Ships with a low-profile bracket, perfect for compact or space-constrained server enclosures
• Streamlined form factor ensures easy installation in 1U or 2U rackmount systems
• Ideal for environments where density and airflow are critical considerations

Ideal Applications for Enterprise and Beyond

• Perfect for high-throughput virtualized workloads and hyper-converged infrastructure
• Supports large-scale cloud deployments and high-availability networking setups
• Excellent for enterprise storage networks, database clusters, and high-performance computing (HPC)
• Compatible with modern server platforms requiring fast and dependable Ethernet links

Technical Summary & Compatibility Notes

• Data Transfer Rate: Capable of up to 25 Gbps per port, maximizing throughput for data-heavy tasks
• Part Number: AOC-S25G-M2S – Official SKU for procurement and inventory management
• Dual-port architecture enables redundancy or link aggregation for improved fault tolerance and speed
• Protocol: Ethernet – Fully compliant with current networking standards and scalable for future demands

High-Speed Networking for Next-Generation 

The Supermicro AOC-S25G-M2S dual-port 25GbE/10GbE SFP+ network adapter is a high-performance connectivity solution built to meet the rigorous demands of modern cloud computing, enterprise networking, and high-performance computing (HPC) environments. Designed with a PCIe Gen3 x8 interface and offering dual-port SFP28 compatibility, the AOC-S25G-M2S delivers robust throughput, low latency, and scalable bandwidth capabilities that empower infrastructure to achieve seamless data transfers, virtualization, and mission-critical workload management. Whether used in hyper-converged systems, high-density server nodes, or edge computing deployments, this network adapter provides a versatile and future-ready Ethernet solution.

25GbE Ethernet – Next-Gen Speed for Scalable Network Infrastructure

The evolution from 10GbE to 25GbE is driven by the increasing demands of virtualization, big data analytics, and hyperscale cloud infrastructure. The Supermicro AOC-S25G-M2S supports both 10GbE and 25GbE speeds, making it ideal for enterprises transitioning to faster infrastructure without overhauling existing cabling. The 25Gbps data rate per port enhances network performance while preserving operational efficiency, allowing data centers to reduce bottlenecks and improve server-to-server communications.

Advantages of 25GbE over 10GbE

• 2.5x performance improvement per port without significant increase in power consumption
• Reduced total cost of ownership (TCO) through higher throughput per lane
• Improved infrastructure density with fewer links and switches
• Optimized for NVMe-over-Fabrics, RDMA, and containerized workloads
• Supports backwards compatibility with 10GbE infrastructure

Dual SFP28 Ports for Flexible Fiber Connectivity

The Supermicro AOC-S25G-M2S integrates two SFP28 ports, offering enhanced bandwidth and optical flexibility. These ports support both SFP+ (10GbE) and SFP28 (25GbE) transceivers, enabling customers to deploy either speed depending on the application requirements or infrastructure readiness. This adaptability makes it ideal for hybrid networking scenarios where legacy and next-gen systems coexist.

Compatible Transceiver Options

• 10GBASE-SR / 25GBASE-SR optical modules for short-range connectivity
• 10GBASE-LR / 25GBASE-LR optical modules for long-range applications
• DAC and AOC cables for low-cost, short-reach interconnects
• Hot-swappable for ease of installation and upgrades

PCIe Gen3 x8 Interface for Maximum Bandwidth Utilization

Featuring a PCIe 3.0 x8 host interface, the AOC-S25G-M2S ensures high-speed data transfer between the network and the host system. With enough bandwidth to fully support dual 25Gbps traffic streams, this interface minimizes latency and prevents performance bottlenecks. It's ideal for compute-intensive applications, virtual machines, and workload-intensive services that require sustained network throughput.

PCI Express Integration Benefits

• Full-duplex communication for bi-directional traffic
• Native support in modern Supermicro server motherboards
• Low-latency data path between adapter and CPU/memory subsystem
• Stable performance under virtualization and packet-intensive loads
• High reliability with advanced error detection and correction

Optimized for Virtualization, Containerization, and HPC Environments

The AOC-S25G-M2S is built to handle multi-tenant workloads, offering advanced virtualization support such as SR-IOV (Single Root I/O Virtualization) and VMQ (Virtual Machine Queues). These features significantly reduce CPU overhead and streamline data flow in environments using hypervisors or container-based orchestration platforms like Kubernetes and OpenStack. In HPC environments, this adapter supports RDMA over Converged Ethernet (RoCE) to enable low-latency node-to-node communication.

Virtualization & HPC Feature Set

• SR-IOV for hardware-level VM-to-network isolation
• VMQ and VMMQ support to improve VM scalability
• RoCE v2 for low-latency RDMA support over standard Ethernet
• Network Offloads including checksum and segmentation
• Hardware-level packet filtering and security enforcement

Compact, Energy-Efficient Design for Dense Server Environments

Designed to operate with high reliability in dense rackmount servers and data center configurations, the AOC-S25G-M2S offers an energy-efficient architecture with a low thermal design power (TDP). The adapter features advanced thermal management to ensure consistent performance in high-temperature environments without the need for excessive airflow or active cooling components.

Physical Design Highlights

• Low-profile and full-height brackets included
• Ideal for 1U/2U rackmount and blade servers
• Efficient heat dissipation for reduced system cooling demands
• Passive design minimizes power draw under load
• Built with enterprise-grade components for 24/7 reliability

Broad OS and Driver Compatibility

The AOC-S25G-M2S is supported by a wide range of operating systems, making integration into diverse environments easy and seamless. Supermicro provides verified driver packages and support for leading server operating systems, including various Linux distributions, VMware ESXi, Microsoft Windows Server, and more.

Driver and OS Support

• Red Hat Enterprise Linux, CentOS, and Ubuntu
• VMware vSphere ESXi 6.7 and later
• Microsoft Windows Server 2016, 2019, and 2022
• SUSE Linux Enterprise Server (SLES)
• FreeBSD and other open-source OS support

Data Center Use Cases and Application Scenarios

The Supermicro AOC-S25G-M2S is engineered for high-density networking environments where performance, reliability, and scalability are critical. From cloud infrastructure to edge deployments, this adapter supports a wide range of enterprise and service provider scenarios.

Ideal Use Cases

• Data center aggregation and leaf-spine networking
• High-performance virtualized server clusters
• AI/ML clusters requiring high-speed interconnects
• Distributed storage platforms and hyper-converged infrastructure
• Service provider networks and telecom infrastructure