AI Data Center Deep Dive — Part 3. NVIDIA gets a share, HBM, optical, and power must follow at theirs. Reverse-engineering revenue ceilings by industry through BOM accounting identity.
BOM share is the revenue ceiling by industry. NVIDIA 61% · HBM 15.5% · TSMC 5.8% · optical 6.5% · cooling 1.6% — no component can exceed its BOM share.
Of the USD 2,660B room from 70GW × USD 38B over 2026~2028, NVIDIA penetration is 20.2%, HBM 14.9%, optical 15.8%, power 10.2%. SK Hynix P/S 4.4x and GE Vernova 3.7x vs NVIDIA 24.6x — the penetration gap has not been priced in.
The single variable is a scenario where NVIDIA's 60% BOM position shrinks. Rubin inference efficiency (10x tokens/GPU) and ASIC penetration (Broadcom Google TPU) are the mechanisms — but HBM is used identically by ASICs, so the component-industry cycle holds.
The cluster with low BOM penetration relative to share and low P/S — SK Hynix, GE Vernova, Coherent — has the most revenue acceleration room. NVIDIA and Broadcom are already priced at P/S 24~30x; TSMC at 46% penetration is core. Monitor NVIDIA Q3 FY27 guidance, the CoWoS capacity expansion schedule, and SK Hynix operating margin.
is an accounting identity. When NVIDIA sells a system for USD 3.1M, that USD 3.1M lands NVIDIA's income statement as revenue. But the USD 480K inside that system is NVIDIA's COGS (Cost of Goods Sold) and SK Hynix's revenue at the same time. The same USD 1 doesn't move from NVIDIA's revenue into SK Hynix's revenue — it gets recognized as revenue by each company simultaneously, at each layer.
The recognition timing does shift. A component supplier books revenue when shipping to NVIDIA; NVIDIA books revenue when shipping the system to the end customer. The lag from component shipment to system shipment is typically one to three quarters. So the industry revenue cycle flows in order — HBM and TSMC revenue → NVIDIA revenue → cloud revenue → model revenue. Components recognize first but at smaller absolute scale; systems recognize later but at much larger scale.
In the AI data center industry, each component sector's revenue follows its BOM share. NVIDIA, as system seller, captures 60% of the capex as its own revenue; HBM, packaging, optical, and power inside the system get recognized as the suppliers' revenue. Once data center capex is set, each industry's revenue ceiling is set with it.
Validation runs in three steps. First, decompose the BOM of one rack (USD 3.1M) at component level to find per-unit revenue by industry. Second, allocate Epoch AI's USD 38B 1GW data center capex by industry to compute per-1GW revenue. Third, multiply by 70GW of 2026~2028 new capacity to find cumulative revenue room by industry. Finally, compare against revenue recognized so far to compute the penetration rate.
No component can earn revenue beyond its BOM share. Industries with low penetration today have the steepest revenue acceleration ahead.
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