Add high-speed Ethernet where dense server design leaves little room for compromise. The Cisco C890 M5 SIOM Card MFG AOC-M25G-M4S-O is built for Cisco C890 environments that need more throughput, more port efficiency, and a cleaner path to scaling network capacity. With 25 GbE connectivity and a 4-port design, this SIOM card is suited to workloads that benefit from separating traffic, increasing aggregate bandwidth, or supporting multiple high-demand services from a single expansion point. It is a strong fit for virtualization clusters, storage-connected servers, and infrastructure refreshes where the network layer must keep pace with modern application demands. Compared with lower-speed adapters, this card gives teams more headroom for east-west traffic and fewer constraints when consolidating workloads. It also fits the kind of deployment where premium hardware earns its cost through fewer bottlenecks, better port economics, and tighter alignment with Cisco platform requirements.