The NVIDIA/Mellanox MMS4A00 (980-9IAH1-00XM00) Compatible OSFP Optical Transceiver is a twin-port OSFP IHS/Closed Finned Top module delivering 2x 800Gb/s (1.6T) for InfiniBand XDR networks. It features a single-mode, silicon photonics–based architecture with eight parallel channels, supporting 2×DR4/DR8 transmission. Each 800G port terminates with a 4-channel MPO-12/APC connector. The module uses 200G-PAM4 electrical modulation and provides reliable short-reach connectivity up to 500 meters over eight single-mode fibers.
Built with a Broadcom 3nm DSP, this transceiver ensures ultra-low bit error rates and stable, high-speed data delivery in high-density deployments. Its IHS/Closed Finned Top design enables effective thermal management for Quantum-X800 switches, supporting both air- and liquid-cooled configurations. Seamlessly pairing with NVIDIA B300 and DGX systems, the module delivers scalable, low-latency GPU-to-GPU and GPU-to-storage connectivity, ideal for AI, HPC, and large-scale data center interconnects, unlocking the full potential of high-performance computing fabrics..
Note: "Finned-top" transceivers are now called "Integrated HeatSink" (IHS) as the cooling fins are integrated into the OSFP connector metal top. Commonly used in air-cooled switches. "Flat-top" transceivers are now called "Riding Heat Sink" (RHS) as the cooling fins ride on top of the network card or systems internal cages. This is used for both air-cooled and liquid-cooled applications for DGX, ConnectX-7, and BlueField-3 DPUS.
