Thor Ultra

Overview

Industry's first 800G AI Ethernet NIC fully compliant with Ultra Ethernet Consortium 1.0, introduced October 14, 2025. Clean-sheet RDMA design (not a dual-400G bond) with packet-level multipathing, out-of-order placement into XPU memory, hardware SACK, programmable congestion control, PCIe Gen 6 x16, and line-rate PSP encryption. Ships as P1800GO (PCIe) and N1800GO (OCP 3.0) 800GbE adapters. Paired with Tomahawk 6, Tomahawk Ultra, Jericho 4, and Scale-Up Ethernet as Broadcom's open Ethernet alternative to proprietary GPU-scale fabrics.

Announced October 2025; 800GbE OCP 3.0 and PCIe adapters listed as active on Broadcom's network-adapter catalog

Key Specs

Bandwidth

800GbE (8x100G or 4x200G SerDes)

Host interface

PCIe Gen 6 x16; OCP 3.0 and standard PCIe CEM