The Definitive Guide toAI Data Centers
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SDC · Silent Data Corruption

Errors that corrupt computation without any alert; at fleet scale they silently spoil training and must be hunted.

Current numbers

~1 fault per 1,000 devices; exposure unstatedMeta reported about one SDC fault per 1,000 devices; exposure period unstated (22 July 2025)as of 2025-07-22 · register ↗
~2.5 billionSDC test seeds per month run by Ripple across Meta's CPU fleet (2022; Fleetscanner counted separately)as of 2022 · register ↗

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