Number of optical modules corresponding to h100

Each DGX H100 server typically requires 4–18 OSFP/400G–800G optical modules depending on network topology and cluster scale.H100 Server-Level Optical Module RequirementsA single DGX H100 server is equipped with eight H100 GPUs and ConnectX-7 network cards supporting NDR 400Gb/s, along with dual-port Bluefield-3 DPUs for IB/Ethernet networks . For computing network connections, each server has four OSFP ports, which can be expanded to eight QSFP ports when connecting to leaf switches. In a SuperPOD configuration using NVLink cluster interconnects, each NVSwitch module corresponds to 4–5 OSFP optical modules, totaling 18 OSFP modules per server for full external NVLink connectivity .Cluster-Level Optical Module RequirementsFor larger clusters, such as a 32-server H100 SuperPOD, the network topology typically uses a two-layer Spine-Leaf or three-layer Fat-Tree architecture. In an all-optical network:400G optical modules are used between servers and leaf switches.800G optical modules are used between leaf-spine and spine-core switches . The ratio of GPU to optical modules in a fully optical H100 cluster is approximately 1 GPU : 6 optical modules for 400G links, with additional 800G modules for spine connections, resulting in thousands of optical modules for hyperscale clusters. For example, a cluster with 1,000 H100 GPUs may require over 10,000 optical modules when accounting for redundancy, intra-rack, and inter-rack connections .Factors Affecting Optical Module CountNetwork Topology: Spine-leaf vs. Fat-Tree architectures influence the number of modules needed for interconnects .Cluster Size: Larger clusters exponentially increase optical module demand due to multi-tier connections .Link Redundancy: Redundant links for fault tolerance effectively double the number of modules per GPU node .Module Type and Speed: Upgrading from 400G to 800G modules reduces the number of physical modules but increases per-port bandwidth .SummaryPer DGX H100 server: 4–18 OSFP/400G–800G optical modules depending on configuration.Per SuperPOD (32 servers): Hundreds to thousands of optical modules, depending on redundancy and network layers.Hyperscale clusters (hundreds to thousands of GPUs): Over 10,000 optical modules may be required for full connectivity and redundancy . The exact number of optical modules depends on network architecture, cluster size, redundancy requirements, and the type of optical modules deployed, making planning critical for high-performance AI deployments.