Rumor
SerDes 224G electrical limits may impact Nvidia's copper interconnect strategy
Monday, January 5, 2026 at 10:17 PM
A user speculates on technical challenges with SerDes at 224G, noting it might impact Nvidia's approach to scale-up with copper interconnects. The user also mentions that aggressive adoption of cutting-edge specifications can be problematic if not realized, potentially narrowing the gap with competitors.
Context
Nvidia’s introduction of NVLink-Fusion and the transition to 224G SerDes are driving a significant surge in demand for Active Electrical Cables (AEC). Formally unveiled at Computex 2025, NVLink-Fusion allows partners to integrate custom silicon directly into Nvidia’s high-speed fabric. As per-lane signaling rates double to 224Gbps, traditional passive copper reaches its physical distance limits, making AEC solutions—which use integrated retimer chips to regenerate signals—essential for maintaining data integrity across modern AI backplanes.
The shift is financially strategic, as copper-based AEC systems cost roughly 1/6 the price of optical module alternatives while offering superior power efficiency. With mass-scale deployments like the GB200 and GB300 utilizing over 5,000 copper interconnects per rack, industry projections for AEC chip shipments have surged toward 25 million units by 2026. This architectural lock-in ensures a robust multi-year growth trajectory for the high-speed interconnect supply chain through 2025 and into the next generation of AI infrastructure.
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