From Chip Design to Physical Bottlenecks: The Next Investment Opportunity in AI Hardware Infrastructure

Core Observations

1. The focus of AI investment is shifting from chip design to physical infrastructure bottlenecks. As GPU computing clusters continue to scale, individual chip performance encounters physical limits. Advanced packaging, high-speed interconnects, and heat dissipation technologies have become key factors determining the actual performance of AI systems. 2. Advanced packaging is the core method to address the "memory wall" and "power wall." Through 2.5D/3D stacking technology, bandwidth and energy efficiency can be improved without increasing chip area, but this also places extremely high demands on manufacturing processes and materials. 3. Optical interconnects replacing copper cables is an inevitable trend. 800G and even 1.6T optical modules will become the standard configuration for AI data centers, driving rapid growth in the optical communication industry chain. 4. Liquid cooling has upgraded from optional to essential. The power density of single cabinets continues to rise (from 10kW to 100kW+), and air cooling can no longer meet heat dissipation needs. The market for direct-to-chip cooling and immersion cooling is poised to explode. 5. The U.S. CHIPS Act and IRA policies are strongly supporting these bottleneck areas. Advanced packaging has been designated as a key investment direction, while optical interconnects and liquid cooling are also highly aligned with energy efficiency improvement goals.

Why is this shift happening?

The computational demand for AI training and inference doubles every 3–4 months, far outpacing the improvement rate of Moore's Law. The transistor density of a single GPU chip has approached physical limits (costs skyrocket after 5nm/3nm), so performance gains must come from stacking multiple chips (e.g., NVIDIA's CoWoS packaging). Meanwhile, clusters with tens of thousands of cards require extremely high internal communication bandwidth. At rates above 800G, traditional copper cables suffer severe signal attenuation and surge in power consumption, making fiber interconnects the only choice. Finally, the heat generated by high-density GPUs (up to 1000W per chip) requires entirely new cooling solutions.

Which industries will benefit?

1. Advanced packaging equipment and materials - Equipment suppliers such as Applied Materials and ASML benefit from increased investment in packaging. - Material suppliers like Shin-Etsu Chemical (Japan) and DuPont (U.S.) will gain new orders. - TSMC's CoWoS capacity remains tight, driving the construction of domestic packaging capacity in the U.S.

2. Optical communications and optical modules - Optical component manufacturers such as Coherent (II-VI) and Lumentum. - Optical module companies like Zhongji Innolight (mostly Chinese, but there is also Fabrinet in the U.S.). - Demand for 800G/1.6T optical modules will grow significantly starting in 2025.

3. Liquid cooling systems - Data center cooling suppliers such as Vertiv, CoolIT Systems, and Boyd Corporation. - Segments including liquid-cooled server cabinets, coolants, and heat exchangers.### 4. Reshoring of U.S. Semiconductor Manufacturing - Advanced packaging fabs will be established in Arizona, Ohio, and other locations, creating high-value-added jobs. - The CHIPS Act has allocated billions of dollars for advanced packaging R&D and mass production.

Which industries will come under pressure?

• Traditional copper interconnects: Market share will be eroded by optical interconnects in ultra-high-speed scenarios.
• Air cooling: High-density data centers will shift to liquid cooling, but air cooling can still be used in low-density scenarios.
• Traditional packaging: Growth of non-advanced packaging (wire bonding, etc.) will slow down.

What does this mean for U.S. manufacturing?

Over the past decade, the U.S. manufacturing sector has lost a large number of downstream assembly links, but the physical bottlenecks of AI hardware are precisely the areas where the U.S. can regain an advantage. Advanced packaging, optical components, and precision thermal management systems are all high-value-added, technology-intensive manufacturing segments that are directly related to national security. Through government investment and corporate incentives, these areas have the potential to become a fulcrum for the revival of U.S. manufacturing.

Long-term impact on the supply chain

• Strengthened vertical integration trend: Hyperscale cloud providers (e.g., Microsoft, Google) may directly contract with packaging and optical module manufacturers, shortening the supply chain.
• Diversification of geopolitical risks: The U.S. promotes domestic capacity build-up, reducing dependence on Asian packaging and optical modules.
• Domestication of equipment and materials: The U.S. will accelerate support for domestic semiconductor equipment and materials companies.

Outlook for the next 5 years

• Advanced packaging capacity: The U.S. will establish at least 2-3 large-scale advanced packaging fabs (expected to begin production in 2027-2029).
• Optical interconnect penetration rate: Over 80% of new AI data centers will adopt 800G or higher optical modules.
• Liquid cooling penetration rate: More than 50% of new racks with power density >50kW will feature liquid cooling as a standard configuration.
• Investment scale: Cumulative investment in the above areas will exceed $300 billion, creating over 100,000 high-tech jobs.

Conclusion

The next wave of winners in AI infrastructure will not be chip design companies, but the "unsung heroes" solving physical bottlenecks. This trend is reshaping the U.S. manufacturing landscape, making states like Arizona and Ohio potential new "hardware Silicon Valleys." Investors and companies should closely monitor technological advances and supply chain shifts in the three key areas of advanced packaging, optical interconnects, and liquid cooling.

*Data sources: Benzinga article "Forget AMD And Micron — The Next Wave Of AI Winners Are The Ones Nobody Talks About" (June 30, 2026); State of AI Economy 2026 report.*