Three Protocols Want Your GPU Fabric. Pick Wrong, Pay 30%

On May 6, 2026, NVIDIA donated Multipath Reliable Connection (MRC) to the Open Compute Project, turning a closed Spectrum-X optimization into an open RDMA transport. That act ended the decade-long pretence that AI cluster networking was settled. Today three open transport protocols — UEC’s UET, Google’s Falcon, and NVIDIA’s MRC …