Broadcom Unveils Thor Ultra: The Industry's First 800G AI Ethernet NIC
1. A Revolutionary Step in AI Networking
On October 14, 2025, Broadcom Inc. (NASDAQ: AVGO), recognized as a global leader in semiconductor and infrastructure software solutions, announced the launch of Thor Ultra, a groundbreaking 800G AI Ethernet Network Interface Card (NIC). This innovative product is designed to interconnect hundreds of thousands of XPUs (Accelerated Processing Units) and drive trillion-parameter AI workloads, marking a significant advancement in the industry's capabilities.
Driving the Future of AI Workloads
The introduction of Thor Ultra aligns with the vision of the Ultra Ethernet Consortium (UEC), aimed at modernizing Remote Direct Memory Access (RDMA) for large AI clusters. Ram Velaga, Senior Vice President and General Manager of the Core Switching Group at Broadcom, emphasized the importance of this launch by stating, “Thor Ultra delivers on the vision of Ultra Ethernet Consortium for modernizing RDMA for large AI clusters.” He further acknowledged the collaborative efforts of customers and the engineering team that brought this innovation to fruition.
Key Features of Thor Ultra
Thor Ultra is not just another NIC; it comes packed with a suite of advanced features that address the limitations of traditional RDMA. Some of its standout capabilities include:
- Packet-Level Multipathing: This feature enhances load balancing, ensuring efficient data transmission across the network.
- Out-of-Order Packet Delivery: Direct delivery to XPU memory maximizes fabric utilization, a critical factor for high-performance AI tasks.
- Selective Retransmission: This innovation allows for more efficient data transfer.
- Programmable Congestion Control Algorithms: Both receiver-based and sender-based algorithms are included to manage network traffic effectively.
Technical Specifications
Broadcom's Thor Ultra NIC boasts a range of specifications that position it as a leader in the industry:
- Available in standard PCIe CEM and OCP 3.0 form factors.
- Supports 200G or 100G PAM4 SerDes with capabilities for long-reach passive copper.
- Features the industry's lowest Bit Error Rate (BER) SerDes, reducing link flaps and accelerating Job Completion Time (JCT).
- Equipped with a PCI Express Gen6 x16 host interface.
- Provides line-rate encryption and decryption with PSP offload, alleviating compute-intensive tasks for the host/XPU.
- Includes secure boot with signed firmware and device attestation.
- Supports packet trimming and Congestion Signaling (CSIG) with Tomahawk 5, Tomahawk 6, or any UEC compliant switch.
Broad Ecosystem Integration
Thor Ultra is positioned as a vital component of Broadcom’s Ethernet AI networking portfolio. It works seamlessly with other products such as Tomahawk 6, Tomahawk 6-Davisson, Tomahawk Ultra, Jericho 4, and Scale-Up Ethernet (SUE), creating an open ecosystem conducive to large-scale, high-performance XPU deployments.
2. Industry Reactions
The press release also featured a range of endorsements from industry leaders, highlighting the anticipated impact of Thor Ultra:
- Michael KT Lee, Senior VP of R&D and Technology at Accton Technology, praised Thor Ultra for its advanced telemetry-ready solutions for AI fabrics.
- Hugh Holbrook, Chief Development Officer at Arista Networks, emphasized the milestone this product represents for scalable AI fabrics.
- Shekar Ayyar, CEO of Arrcus, noted that Thor Ultra sets a new benchmark for congestion management in AI networks.
- Arun Narayanan, SVP at Dell Technologies, highlighted the critical role Thor Ultra will play in supporting demanding workloads in AI infrastructures.
Availability
Broadcom Thor Ultra is now sampling, and interested parties can look forward to obtaining more detailed information about the product.
3. Conclusion
With the launch of Thor Ultra, Broadcom has set a new standard in the networking industry, particularly for AI applications. By combining cutting-edge technology with a commitment to open ecosystems, Broadcom is poised to lead the charge in facilitating the next generation of AI workloads, empowering businesses to achieve unprecedented levels of performance and efficiency.
