USA · operational · hpc

Derecho

Operated by NCAR at NCAR-Wyoming Supercomputing Center .

Phase 1 seed dataset, compiled by hand. These rows were built from public operator, laboratory and vendor sources. A mechanical second-reader pass has since fetched every cited source: 1092 of 1153 systems have a readable citation that names them, and 40 are genuinely weakly sourced. Every claim carries its source and a confidence tier. Treat anything below verified as a lead, not a citation.

Measured performance

Rmax: 10.32 PFlop/s
Rpeak: 12.40 PFlop/s
Rmax ÷ Rpeak: 83.2%
Cores: 316,416
Power: -
Per watt: - GF/W

Figures are as last publicly reported for the configuration described below, not a live measurement. Where a system was upgraded in place, the post-upgrade configuration is shown and the earlier one appears in the timeline.

What this machine is made of

One row per supplier relationship. “Supplier at build” is the company that shipped the part at the time; where that company has since been acquired, the parent it rolls up to today is shown beside it. That distinction is what makes ticker-level aggregation possible across a thirty-year dataset.

Role	Part	Supplier at build	Quantity	Confidence	Source
Integrator	- HPE Cray EX	Hewlett Packard Enterprise HPENYSE	-	Verified	news.ucar.edu cisl.ucar.edu
Accelerator	NVIDIA A100 SXM4 40GB Accelerators CUDA (Ampere GA100) · 6,912C · 1.41 GHz · 7 nm · 400 W 82 GPU nodes with four NVIDIA A100 40GB	NVIDIA NVDANASDAQ	328 reported	Reported	cisl.ucar.edu
CPU	AMD EPYC 7763 (Milan) CPUs x86-64 · 64C · 2.45 GHz · 7 nm · 280 W AMD EPYC 7763, 2,488 CPU nodes	AMD AMDNASDAQ	-	Reported	cisl.ucar.edu top500.org
Interconnect	HPE Slingshot-11 Interconnect Dragonfly · 200 Gb/s per port · Around 2 microseconds HPE Slingshot-11 dragonfly, 200 Gbps per port	Hewlett Packard Enterprise HPENYSE	-	Reported	cisl.ucar.edu

The read

NCAR's HPE Cray EX with 2,488 AMD EPYC 7763 nodes and 82 four-A100 nodes on Slingshot-11, in operation from July 2023 and 59th on the June 2023 TOP500. TOP500 lists the CPU and GPU partitions separately and the figures here are the CPU partition's, since the GPU partition ranked 130th with 4.68 PFlop/s. NCAR's CISL page gives 328 A100 GPUs where its news pages say 382, which looks like a typo, and 318,464 CPU cores against TOP500's 316,416. TOP500 is the only source for Rmax, Rpeak and core count, so the tier is reported.

Timeline

2023-06 List debut at #59 (June 2023) source
2023-07 First operational source

Public list appearances

Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.

#59: TOP500, June 2023 →

Site & facility

NCAR-Wyoming Supercomputing Center

Location: Cheyenne, WY, USA
Commissioned: 2016

top500.org en.wikipedia.org

Where sources disagree

We record conflicts instead of picking a winner quietly. All open questions.

A100 GPU count: 328 GPUs (NCAR CISL) against 382 GPUs (UCAR news). The 382 looks like a transposition; 328 matches 82 nodes of four.

Change history

2026-09-20 Added with a rank pointer on the edition where it ranked highest

Source check

We fetched this system's own citations and recorded whether each page actually mentions it. This is a corroboration signal, not a fact check, and it is published so you can see how well the sourcing holds up rather than take it on trust.

Cited source	Result	Found on the page
cisl.ucar.edu	names system, part and count	AMD EPYC 7763 (Milan), NVIDIA A100 SXM4 40GB · counts: 328
top500.org	names system and part	AMD EPYC 7763 (Milan), HPE Slingshot-11

Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.