AI hardware useful only 5–7 years
Unlike fiber optic cable or railways which last 25+ years, AI computing hardware depreciates and becomes obsolete in roughly 5 to 7 years.
Snapshot · Excess Returns
The $2 Trillion Question | Tobias Carlisle on SpaceX, the AI Buildout, and the Rotation No One Sees
Explore episode
Jun 20, 2026
Where this was said
AI capex and lessons from past technology booms
At 16:12 · chapter starts 14:15
Comparing AI to fiber optic and railway buildouts, Carlisle notes AI hardware lasts only 5-7 years vs. 25+ years for prior infrastructure. Gartner hype cycle dynamics are in play. [1] — Tobias Carlisle "AI hardware useful only 5–7 years: Unlike fiber optic cable or railways which last 25+ years, AI computing hardware depreciates and becomes…" 16:12
AI Value Accrues to Consumers, Not Shareholders
The entire AI infrastructure buildout may end up enriching users rather than investors. Competition among AI providers makes commoditization inevitable — most people will use cheaper, older models rather than pay for the cutting edge. The value creation is real, but investors may not capture it.
AI Hardware Depreciates in 5–7 Years vs. 25+ for Fiber and Rail
Fiber optic cables and railways last 25+ years. AI data center hardware becomes obsolete in 5 to 7 years. This changes the economics of the buildout entirely — the returns need to come faster, and the depreciation risk is far higher than in prior technology booms.
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