AI Rack Power Surge to 600 kW Ignites Heavy Copper PCB Demand

AI data centers are pushing rack power from roughly 120 kW on NVIDIA’s GB200 NVL72 toward 600 kW Rubin Ultra ‘Kyber’ racks, and the surge is cascading straight into the PCB supply chain. Through 2025, demand for heavy copper, IMS, and high-layer-count boards has tightened as hyperscaler capex clears $300 billion, forcing power delivery redesigns down to the board level.

The numbers tell the story. A traditional air-cooled enterprise rack drew 5–15 kW; NVIDIA’s GB200 NVL72 cabinets run near 120 kW, and the roadmap points to 600 kW Kyber systems for Rubin Ultra in 2027, liquid-cooled and fed by an 800 VDC architecture. Microsoft, Amazon, Google, and Meta are collectively committing well over $300 billion in 2025 data center capex, and power delivery — 12 kW-class power shelves, busbars, and rising bus voltages — is absorbing a growing share of that spend. Vertiv, Delta, and Flex are racing to ship 800 VDC-ready infrastructure. Every one of those amps ultimately flows through copper on a board, reshaping PCB specifications from socket to facility.

Suppliers are feeling it. Heavy copper PCBs at 6 oz/ft² and beyond, once niche industrial parts, are now specified as busbar alternatives on rack power distribution boards, and 8 oz designs are moving from exotic toward standard. Insulated metal substrate (IMS) and ceramic PCBs are winning sockets in GaN and SiC power stages, where 5.5–12 kW supplies push heat flux beyond what FR-4 survives. High-layer-count server boards with thick copper foil and embedded copper coins show stretched lead times, and thick copper foil supply is tightening globally. Qualification cycles for high-current boards are lengthening, pushing OEMs to reserve capacity with substrate-capable PCB makers well ahead of build — a break from last cycle’s spot-buying habits.

The trend maps directly onto LT CIRCUIT’s manufacturing base: heavy copper PCBs for high-current power distribution, IMS boards for power-module thermals, ceramic PCBs for RF and wide-bandgap stages, and high layer count multilayer boards for AI server backplanes. OEM engineering teams scoping 100 kW-plus rack designs can request stack-up reviews, current-carrying guidance, or prototype samples directly through our engineering channel.