Network adapter Supermicro AOC-A25G-B2S-O — dual-port 25GbE PCIe

The Supermicro AOC-A25G-B2S-O — dual-port 25GbE PCIe network adapter provides two 25 gigabit Ethernet interfaces for high-throughput server and storage connectivity. Designed for installation in a PCIe slot, this adapter is intended to deliver increased network capacity and lower latency for environments that demand reliable, high-speed links. The card supports standard server installations and is suitable for integration into rack systems and blade servers that accept full-height PCIe add-in cards.

Advantages

The dual-port 25GbE configuration enables concurrent high-speed connections, improving aggregate bandwidth and providing redundancy options. Low-latency operation and support for modern Ethernet features reduce overhead for virtualization and storage traffic. The PCIe interface offers direct connection to host resources, ensuring consistent throughput for data center workloads.

Suitable for

• Server-to-switch uplinks requiring 25GbE throughput
• High-performance virtualization hosts
• Storage networks and NVMe-over-Fabrics front-end connectivity
• Compute clusters and high-performance computing nodes
• Environments needing increased network capacity and low latency

Key specifications

• Interface: PCI Express (add-in card)
• Number of ports: 2x 25 Gigabit Ethernet
• Data rate per port: 25 Gbps
• Form factor: full-height PCIe adapter
• Designed use: server and data center networking

How to use

Install the adapter into an available PCIe slot on a compatible server following the server manufacturer's hardware installation procedures. Secure the card to the chassis, connect appropriate optical or copper transceivers and fiber/cable assemblies that match the 25GbE interfaces, and configure the host operating system network drivers and firmware as required. After physical installation and cabling, assign IP addressing, configure link aggregation or VLANs as needed, and validate connectivity and throughput with standard network diagnostics.

Usage recommendations

For optimal performance, pair the AOC-A25G-B2S-O with compatible 25GbE switches and use certified transceivers or cables. Keep firmware and drivers up to date and verify server BIOS settings for PCIe lane configuration to ensure full bandwidth. When deploying in virtualization or storage environments, plan network segmentation and quality-of-service settings to maintain low latency and predictable throughput.