Copper Connectivity Inside the AI Cluster: DAC, AEC, Busbar, and the Optical Transition
Quantifies copper consumption per rack and per megawatt from direct-attach and active copper cabling, backplane busbars, and power distribution inside AI GPU clusters, and weighs the pace at which optics displace copper in the scale-up fabric.
Inside a single flagship GPU rack, several thousand copper scale-up cables and kilometers of twinaxial wiring carry the fabric load, making in-rack copper intensity for AI compute far higher than for conventional servers. This report sets out the copper bill of materials across four end-uses: passive and active direct-attach cables, scale-up cluster cabling, power-distribution busbars, and structured management cabling. The shift from passive to active electrical cables at 800G, where passive copper reach collapses to a couple of meters, is the central substitution dynamic governing near-term intensity. Co-packaged optics enter switch deployments from 2026 and scale-up optical links target 2027 to 2028, defining a credible but extended displacement timeline. A per-cluster demand model and an optical-adoption sensitivity close the report.
What's inside
- 01Executive Summary: In-Rack Copper Intensity and the Optical Threshold
- 02In-Rack Architecture: Scale-Up Fabric Topology and Cabling
- 03Direct-Attach Copper Cables: Passive Reach Limits at 400G and 800G
- 04Active Electrical Cables: Reach Extension, Power Budget, and Adoption
- 05Busbar and Power Distribution: Copper Intensity per Rack
- 06Structured and Management Cabling: Twinaxial and Out-of-Band Loads
- 07Copper Bill of Materials: Per-Rack and Per-Megawatt Intensity
- 08The Optical Displacement Threshold: Co-Packaged Optics and Silicon Photonics
- 09Supply Chain for High-Speed Copper Assemblies: Producers and Lead Times
- 10Demand Projections 2025 to 2030: Optical Adoption Sensitivity
- 11Market and Pricing Implications for Specialty Copper Products
- 12Data Sources, Configuration Assumptions, and Sensitivity Parameters
- ↳Copper Connectivity Inside the AI Cluster trend dashboard (historical + forward scenarios)
- ↳AI infrastructure demand curve by mineral
- ↳Processing concentration map by country
- ↳Technology pathway adoption timelines
- ↳Supply-security stress-test matrix
- ↳Sensitivity matrix: price, cost, and policy variables
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