El Capitan
El Capitan was built by HPE Cray and operated by Lawrence Livermore National Laboratory in United States. It topped the TOP500 for 2 consecutive lists, reaching 1.742 EFlop/s.
Peak Rmax
1.742 EFlop/s
Cores
11,039,616
Vendor
HPE Cray
Country
United States
How it was built
- Architecture
- HPE Cray EX255a
- Node
- AMD Instinct MI300A APUs, combining CPU cores, GPU cores and high-bandwidth memory in one package
- System interconnect
- HPE Slingshot
- Cooling
- Direct liquid cooling
- El Capitan is built from more than 11,000 compute nodes and reaches a peak of 2.79 exaflops, against the 1.742 sustained figure that gives it first place on the TOP500.
- LLNL puts it at roughly 22 times the capability of Sierra, the laboratory's previous flagship.
- Its purpose is the NNSA Stockpile Stewardship Program, which certifies the US nuclear stockpile without testing.
- An unclassified sister system, Tuolumne, runs open science work including climate and energy research.
Detail drawn from Lawrence Livermore National Laboratory.
Time at number one
| List | Rmax | Cores |
|---|---|---|
| November 2024 | 1.742 EFlop/s | 11,039,616 |
| June 2025 | 1.742 EFlop/s | 11,039,616 |