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El Capitan (LLNL)
Data Center
Reference
Operating
Livermore, California, US
The fastest disclosed computer on Earth — MI300A APUs for the nuclear stockpile.
You're looking at a data-center record: a real facility — who runs it, what hardware fills it, and where its power comes from.
El Capitan at Lawrence Livermore topped the TOP500 in November 2024 at 1.742 exaFLOPS, built by HPE from 44,544 AMD MI300A APUs. Its mission is classified stockpile stewardship — a reminder that state compute still rivals the biggest commercial clusters.
Specifications & key facts
Each figure is labeled by basis: vendor spec, vendor claim, reported, estimate, or official. "Not publicly disclosed" means exactly that — we never invent values.
Overview
Operator
US DOE — Lawrence Livermore National Laboratory
Scale
Performance
1.742 exaFLOPS Rmax (HPL, Nov 2024)Official
Power
Power
~30 MW classReported
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Contains
Hardware deployed
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Sources
Record reviewed as of 2026-01-15 — see Methodology.