The Definitive Guide toAI Data Centers
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PSU · Power Supply Unit

The component that converts incoming AC or DC into the regulated voltages a server or GPU node consumes.

Current numbers

Base 10 days; stress 20 daysCommodity PSU delivery interval: base and stress assumptions; separate from demand-observation exposureas of 2026-09-08 · register ↗
~400 J/GPUpower-shelf PSU capacitor energy targeted for Vera Rubin closed-loop smoothingas of 2026-03 · register ↗
65 J/GPUenergy storage integrated in GB300 NVL72 power shelves; ~half the PSU volume is capacitanceas of 2025 · register ↗

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