Semiconductor supply chain expands as AI capex broadens beyond chips

The narrative that AI capex is "NVIDIA only" is eroding as infrastructure spending diversifies. NVIDIA retains its leadership position (training chips, H100/H200 sales), but the capex cycle is now reaching substrate makers, advanced packaging specialists, high-bandwidth memory (HBM) manufacturers, and optical networking providers. Broadcom, for example, saw its stock underperform NVIDIA on May 13 despite broader semiconductor strength, but it is still the primary beneficiary of AI datacenter switching fabrics and network interconnects. AMD is benefiting from renewed enterprise adoption; Daiwa upgraded AMD to Outperform from Buy with a $500 price target, citing strong Q1 results and Q2 guidanceCompany-issued forecasts of future financial performance..

The "Bottleneck Map" narrative is gaining traction among investors and analysts. As AI infrastructure complexity rises, bottlenecks shift from chips to packaging, thermal management, and networking. Substrate makers and HBM suppliers (SK Hynix, Samsung) are capital-intensive but face volume constraints. Packaging firms (AMKOR, ASM Pacific) are expanding capacity. Optical interconnect vendors (Broadcom, Cisco) are indispensable for linking GPUs and disaggregated fabric architectures. This is a structural opportunity for "second-order" semis, which trade at lower multiples than NVIDIA but offer comparable growth.

Capital allocation is shifting. Institutional investors are rebalancing away from monolithic mega-cap positions into diversified semiconductor and infrastructure plays. Nvidia's Jensen Huang's trip to China on Trump's delegation adds credibility to the AI capex boom narrative, but it also validates that chipmaking is mature and manufacturing is shifting to regional partners. US firms (Broadcom, AMD, Intel) will capture packaging and design share, while Taiwan and South Korea remain critical for fabrication and memory.

The risk is that capex diversification reflects peak capex fears being priced in. If hyperscalers slow data-center builds due to margin pressures or macro uncertainty, second-order semis will suffer more sharply than NVIDIA because they lack NVIDIA's pricing power and contract visibility. Western Digital's recent outperformance over NVIDIA (up 3x more in one month) suggests some sector rotation is already underway, though it may reflect mean reversion rather than a structural shift in demand.