Beneficiaries are expanding from standalone GPUs into packaging/back-end, power transmission/thermal management and energy sources
The largest growth industry in the US is AI, and the most important task is building data centers for AI. The needs are largely twofold: semiconductors and power.
Most stocks that have risen steadily since GPT and 2024 are tied to those two areas. NVIDIA GPUs for training came first, memory for inference now reflects the current era, and power has moved from gas turbines and transformers into fuel-cell themes.
Beyond that are liquid cooling and many other themes for thermal control. It is time to organize the map and check which narratives are being missed.
Semiconductors: NVIDIA and Broadcom as fabless names, TSMC and Samsung as foundries, and Samsung, SK Hynix, Micron, SanDisk and Kioxia for DRAM and NAND.
Power: GE Vernova, Eaton and Quanta for turbines and infrastructure; Hyosung Heavy Industries, HD Hyundai Electric and LS Electric for transformers and distribution.
For big tech, GPUs, TPUs and memory remain core. The changing bottlenecks are packaging process shifts, copper-wire power and heat issues, and the search for energy sources that solve land and environmental constraints.
Point 1 - Packaging Process Shift
The core is no longer a single chip. A system package determines performance, yield, cost and power efficiency. AI accelerators now compete through advanced packages integrating die/chiplets, HBM, interposers or bridges, fine RDL wiring and ABF substrates.
Advanced 2.5D/3D packaging faces bottlenecks in lines, equipment, process talent and testing. Key players include TSMC, Samsung, Intel and OSATs such as ASE, Amkor and JCET.
HBM packaging and stacking combine memory with package yield, heat, power and signal integrity. Equipment, bonding, assembly and inspection vendors matter as hybrid bonding and chiplets increase process difficulty.
Do not look only at CoWoS. OSAT, packaging equipment, substrates, testing and burn-in need to be viewed as one basket.
Point 2 - Copper, Heat and Power Transmission Bottlenecks
The copper-wire heat issue combines two problems: power transmission/distribution and data movement.
As rack power density rises, current surges, causing I2R losses, heat and cable or busbar growth. The near-term path is 48V racks; the longer-term path is 800V-class HVDC architecture in high-density zones.
Power-side baskets include SiC/GaN power semis, power distribution and protection, UPS/PDU/busway, cables and conductors, connectors, transformers, switchgear and distribution networks. In many cases, transformers, switchgear and interconnection lead times become the first bottleneck before generation.
For data movement, reducing copper means moving toward photonics. AI clusters spend enormous power on networking and interconnects, so CPO and silicon photonics matter. The full AI Factory map requires compute/memory, power and networking via switch ASICs plus optical.
Point 3 - Land and Environmental Constraints: 24/7 Power
Big tech is building several energy-source portfolios not only because demand is large, but because lead time, regulation, carbon, water and 24/7 availability all matter.
Nuclear and SMR offer 24/7 large-scale carbon-free power but face permitting, time and policy risk. Geothermal offers 24/7 baseload but is location-constrained. Renewables plus storage provide scale and speed, but intermittency and grid linkage are key. Onsite gas turbines or gas engines avoid grid delays but face carbon, fuel-cost and regulation issues. Fuel cells are onsite, relatively clean and modular but depend on fuel economics and policy.
Representative baskets include GE Vernova, Siemens Energy and Mitsubishi Power for turbines; Caterpillar, Cummins and Rolls-Royce mtu for gas engines and generators; Bloom Energy for fuel cells; and Quanta Services for grid EPC.
Mid-check: Five Easy-to-miss Axes
Packaging includes OSAT, equipment, substrates and testing.
Add networking through switch ASICs and optics/CPO.
Track the power architecture shift from 48V to 800V HVDC.
Watch grid bottlenecks in transformers, switchgear and interconnection lead times.
That is the map for now.