El Capitan

El Capitan node architecture

El Capitan is operated by Lawrence Livermore National Laboratory in United States. This profile covers the documented compute inventory. Specifications are listed below; anything the operator has not published is itemised in the documented-fields list.

Published benchmark (TOP500 · June 2026)

HPL rank

#2

HPL Rmax

1809 PFlop/s

Theoretical peak Rpeak

2821.1 PFlop/s

Ranked core count

11,340,000

Measured power

29685 kW

Energy efficiency

60.94 GFlop/s per watt

Scope and uncertainty

Four APUs per node: each combines CPU and GPU with 128 GiB shared memory. Installed node count differs from the benchmark configuration.

Documented fields: 20 / 26

Every field this catalog checks. Fields listed above have a value; the remainder are shown here. A field marked absent is not publicly available in the sources we could verify, which does not mean the hardware is missing. Fields that cannot apply, such as benchmark results for an unranked system, are excluded from the total.

Cluster — 7 / 7

• ✓Manufacturer
• ✓Ranked core count
• ✓Theoretical peak (PFlop/s)
• ✓Measured power (kW)
• ✓Energy efficiency (GFlop/s per watt)
• ✓Operating system
• ✓Network topology

MI300A compute — 13 / 19

• ✕System / node model
• ✓Compute nodes of this type
• ✓CPU model
• –CPU sockets per node
• –Cores per socket
• –Physical CPU cores
• ✕CPU note
• ✓Accelerator model
• ✓Physical accelerators per node
• ✓Host / unified memory
• ✓Accelerator memory
• ✓Accelerator ↔ accelerator link
• ✓On-node fabric
• ✓CPU ↔ accelerator link
• ✓Network interfaces per node
• ✓Interface model
• ✓Interface speed
• ✕Interface-to-accelerator topology
• –Aggregate scale-out per node
• ✕GPUDirect RDMA
• ✕Management / storage networking
• ✕Local storage
• –NVMe data disks
• –Max remote data disks
• –Uncached disk IOPS
• –Uncached disk throughput (MBps)
• ✓Form factor

Sources

• TOP500 · June 2026
• LLNL · hardware overview
• TOP500 · system record

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