El Dorado

Sandia National Laboratories

Node type

CPU Accelerator Interconnect

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El Dorado node architecture

El Dorado is operated by Sandia National Laboratories in United States. This profile covers Ranked system / partition. Specifications are listed below; anything the operator has not published is itemised in the documented-fields list.

Published benchmark (TOP500 · June 2026)

HPL rank: #41
HPL Rmax: 68.02 PFlop/s
Theoretical peak Rpeak: 95.29 PFlop/s
Ranked core count: 383,040
Measured power: 1110 kW
Energy efficiency: 61.28 GFlop/s per watt

Cluster · MI300A compute

Operator / site: Sandia National Laboratories
Country: United States
Profile scope: Ranked system / partition
Data checked: 14 September 2026
Manufacturer: HPE
Ranked core count: 383040
Theoretical peak (PFlop/s): 95.29
Measured power (kW): 1110
Energy efficiency (GFlop/s per watt): 61.27927927927928
Operating system: TOSS

MI300A compute

System / node model: HPE Cray EX255a
Compute nodes of this type: 384
CPU model: AMD Zen 4 · 24 cores per APU
Accelerator model: AMD Instinct MI300A
Physical accelerators per node: 4
Host / unified memory: 512 GiB unified HBM3
Accelerator memory: Shared with CPU
Accelerator ↔ accelerator link: Infinity Fabric
On-node fabric: AMD Infinity Fabric — each APU fully connected to its peers by two links at 256 GB/s
CPU ↔ accelerator link: On-package Infinity Fabric
Network interfaces per node: 4
Interface model: HPE Slingshot 11
Interface speed: 200 Gb/s (25 GB/s) per interface · 100 GB/s node injection
Form factor: 3 compute cabinets (HPE Cray EX4000 with EX255a blades)

Scope and uncertainty

Node count and cabinet count follow Sandia. The per-node specification follows the LLNL ATS-4 hardware overview, which documents one node design shared by El Capitan, Tuolumne, El Dorado and rzAdams.

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 — 6 / 7

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

MI300A compute — 14 / 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

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