Is AI a Bubble? | Gavin Baker on Data Centers, GPUs, and the AI Economy

Where this was said

The AI Bubble Question: Dark Fiber vs. Dark GPUs

At 3:15 · chapter starts 2:50

David George opens with staggering numbers: $1 trillion of data centers in the US, plans to add $3–4 trillion over five years, a data center buildout that already dwarfs the entire US interstate highway system in inflation-adjusted dollars, and a 150x increase in Google's token processing over just 17 months ^{[2] — Gavin Baker "10-point ROIC increase for big CapEx spenders: The biggest public GPU spenders have seen approximately a 10-point increase in return on inv…" 04:45 Play} . The scale sounds terrifying, but Baker is unfazed ^{[1] — Gavin Baker "In the 2000 bubble, 97% of all fiber laid in America was dark — unused and worthless. Today, every GPU is running hot. Baker's ROIC test co…" 03:38 Play} . He walks through two key comparisons: Cisco peaked at 150–180x trailing earnings in 2000 versus NVIDIA's current ~40x multiple, and unlike dark fiber — where 97% of installed cable sat unused at the bubble's peak — every GPU is running at capacity. The most rigorous test, Baker argues, is ROIC: the biggest public GPU spenders have seen roughly a 10-point increase in their returns since ramping up CapEx ^{[2] — Gavin Baker "10-point ROIC increase for big CapEx spenders: The biggest public GPU spenders have seen approximately a 10-point increase in return on inv…" 04:45 Play} . The ROI on AI infrastructure spending, he concludes, has been unambiguously positive — even if future Blackwell spending will be a fair test.

Business

Cisco peaked at 150-180x trailing earnings vs NVIDIA at 40x

Is AI a Bubble? | Gavin Baker on Data Centers, GPUs, and th… · Jul 14, 2026

Cisco peaked at 150–180x trailing earnings during the 2000 bubble; NVIDIA trades at roughly 40x — a much more moderate valuation.

3:38 – 4:00

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Technology

No Dark GPUs: Why AI Is Not a Bubble

Is AI a Bubble? | Gavin Baker on Data Centers, GPUs, and th… · Jul 14, 2026 Technology

In the 2000 bubble, 97% of all fiber laid in America was dark — unused and worthless. Today, every GPU is running hot. Baker's ROIC test confirms it: the biggest AI CapEx spenders have seen roughly a 10-point increase in return on invested capital since the buildout began. The numbers say this is not a bubble.

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Technology

97% dark fiber at bubble peak

Is AI a Bubble? | Gavin Baker on Data Centers, GPUs, and th… · Jul 14, 2026

At the peak of the 2000 internet/telecom bubble, 97% of fiber laid in America was dark — unused and unlit — the defining sign of overbuilding.

3:54 – 4:30

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At the peak of the bubble, 97% of the fiber that had been laid in America was dark. Contrast that with today. There are no dark GPUs.

Gavin Baker

Is AI a Bubble? | Gavin Baker on Data C…

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It is a return on invested capital of the biggest spenders on GPUs who are all public. And those companies, since they ramped up CapEx, have seen, call it a 10-point increase in their ROICs.

Gavin Baker

Is AI a Bubble? | Gavin Baker on Data C…

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Business

10-point ROIC increase for big CapEx spenders

Is AI a Bubble? | Gavin Baker on Data Centers, GPUs, and th… · Jul 14, 2026

The biggest public GPU spenders have seen approximately a 10-point increase in return on invested capital since ramping up AI CapEx, signaling strong returns so far.

4:45 – 5:20

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Business

$300B free cash flow annually from big tech

Is AI a Bubble? | Gavin Baker on Data Centers, GPUs, and th… · Jul 14, 2026

The major hyperscalers collectively generate around $300 billion of free cash flow per year, with $500 billion of cash on their balance sheets, underwriting AI CapEx.

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Technology

1 gigawatt of compute costs $40–50B on NVIDIA chips

Is AI a Bubble? | Gavin Baker on Data Centers, GPUs, and th… · Jul 14, 2026

Lighting up 1 gigawatt of AI compute capacity on NVIDIA chips costs approximately $40–50 billion.

6:58 – 7:22

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