Advanced multi-layer circuit boards that carry high-speed signals inside AI servers, switches, and accelerator trays. Only qualified board makers can produce reliable high-layer-count designs at scale, so tightness is set by that specialist capacity relative to system-build demand.
A sustained tight read means specialist board capacity, not general PCB supply, sets how many AI servers and switches can be assembled. Only qualified makers can build reliable high-layer-count designs, so systems queue behind that capacity even when other parts are ready. The read leans on the revenue of AI-server and networking board makers, a proxy that tracks how hard that capacity is worked, not board output directly. Relief arrives only as qualified high-speed capacity ramps, over quarters rather than a single order cycle.